Malicious PDF — malware analysis report

Static analysis result for SHA-256 e423cbec75583995…

MALICIOUS

PDF

144.6 KB Created: 2021-07-03 15:24:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7229c8a7207237a35f53fee9944f9f66 SHA-1: 328de5435a5f677184779293f6dea86e0ffb89ee SHA-256: e423cbec75583995182d68d24ff3580f629efcdf4f6b0d01f1ca6e90509a4407
276 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File T1554 Interferes with Security Tools

This PDF document exhibits characteristics of a ClickFix social engineering attack, aiming to bypass security measures by instructing the user to disable antivirus and execute a command. The presence of multiple links to compromised WordPress sites and a suspicious URL suggests an attempt to deliver a payload or phish for credentials, likely related to PayPal based on the SE_BRAND_CREDENTIAL_PHISH heuristic. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9739

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://synerhu.ru/uplcv?utm_term=synapse+roblox+injector.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://synerhu.ru/uplcv?utm_term=synapse+roblox+injector PDF link annotation
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d07239579a---89132992002.pdfIn PDF document text
    • http://minhphucvietnam.com/uploads/userfiles/file/78178336228.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609254dd9833b---rabolubexevefaludit.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc96dca47e---tifakonu.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160766e69469e1---jubawaxojelumiz.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/taxapedewulusix.pdfIn PDF document text
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/xaforujajesejefirutir.pdfIn PDF document text
    • https://thieumaunao.vn/workspace/develop/uploads/ck_upload/files/dumipelajozaruzemapitis.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c7a3fbcdc76---62525772652.pdfIn PDF document text
    • https://peiitw.com/Upload/ckeditor/files/zelejusu.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087f2489813c---11805701488.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/pizodiwigim.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160db38f314245---mofosawobanosuxojog.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/c46a35019d02a992f1b89c4522c65f5e/zozivitosetaziwara.pdfIn PDF document text
    • http://accu-chek-event.com/ckupload/files/16109097587.pdfIn PDF document text
    • http://vinag7furniture.com/app/webroot/files/editor_upload/files/miladesewof.pdfIn PDF document text
    • https://pointvirgule.ca/upload/editor/file/56533571133.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609da453de332---84731140930.pdfIn PDF document text
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/3175d52f35e72f22153a4715d96974d4/kajotuf.pdfIn PDF document text
    • http://casier-a-bouteilles.com/file/13585253231.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab57aeb2a28---zikuritozivusi.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/62p0od5ql5t09i8bloih8f064c/78541065490.pdfIn PDF document text
    • http://rioairporttransfer.com/ckfinder/userfiles/files/25416901957.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0001aca5.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1ACA5 18796 bytes
SHA-256: 51bec64774698bb591df958cf917673205118ebec5034d8bc6ad079b1fb37817
font_01_sfnt_off0001cb1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CB1A 21432 bytes
SHA-256: 9c6cb8037a057f12fc34b52518ef08a6783f23170d0a24db873e55322c848ca4
font_02_sfnt_off0002035a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2035A 10928 bytes
SHA-256: a9a0d1ea90d52e9f8454a101ceefb924c09fe0459486d0520574a958d66bfb05
font_03_sfnt_off00021c92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21C92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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