Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd2763c168b0dbca…

MALICIOUS

PDF

81.7 KB Created: 2021-09-17 20:52:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 672f9f8acc7be1ecd5cd231dd3a5a5f5 SHA-1: 2319407f95aa80bec769806e576cf0a4f087b125 SHA-256: fd2763c168b0dbca5a251c43d6f5798321141077ec030362356f14b1e9c34baa
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a callback phishing lure, instructing the user to call a phone number in a context of billing or security issues. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the presence of external links and the nature of the lure suggest it's designed to facilitate social engineering attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://ewdel.cz/ckfinder/userfiles/files/97882877492.pdf In PDF document text
    • https://jerseyshorepirates.com/userfiles/files/luvirozagakajiwunotud.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144af54e1cf5---10124581326.pdfIn PDF document text
    • http://land89.com/ckupload/files/37493437991.pdfIn PDF document text
    • http://uralinteh.com/uploads/files/68896813033.pdfIn PDF document text
    • https://uzsienis.cvzona.lt/resources/img/files/fegufulozinuwirafulu.pdfIn PDF document text
    • https://stka.gr/ckfinder/userfiles/files/77470868104.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/95796075028.pdfIn PDF document text
    • https://www.premiumtrade.ro/ckfinder/userfiles/files/zuwokimukixajuzuwatizag.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613841b170d22---9645939447.pdfIn PDF document text
    • http://yogaschoolofkerala.com/photos/editor/files/56063403771.pdfIn PDF document text
    • http://neogmbh.de/www/sites/default/files/userfiles/file/pitobikonobasefemilovaxa.pdfIn PDF document text
    • http://titadoorbinhduong.com/upload/files/sojazowo.pdfIn PDF document text
    • http://safires.cz/ckfinder/userfiles/files/julezobela.pdfIn PDF document text
    • https://gaadalagi.com/contents/files/tutedarilok.pdfIn PDF document text
    • http://biondiairsystem.it/userfiles/files/25041171990.pdfIn PDF document text
    • http://hanmih.com/userfiles/file/20210901150333.pdfIn PDF document text
    • https://granitabrasive.hu/editor_up/21736857141.pdfIn PDF document text
    • http://wxeina.com/userfiles/files/38947585399.pdfIn PDF document text
    • http://2m-m.eu/userfiles/files/jezoxesovobiwimikuzub.pdfIn PDF document text
    • http://phrabat.net/UserFiles/File/16376214337.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/92104699323.pdfIn PDF document text
    • https://mimpishio2.com/contents/files/borixopuzutaruwezeni.pdfIn PDF document text
    • http://pampa.be/uploads/userfiles/files/gakexopusulatilom.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/p0d2cmdu40b41n5m6nptkmeql4/rozawakezawex.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613726d8b100f---xuxojazobigopiluxiluve.pdfIn PDF document text
    • https://foulardfotografando.it/file/22611023278.pdfIn PDF document text
    • https://www.karenloIn macro / runtime command snippet
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+sync+email+to+android+phonePDF link annotation
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA6C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f27e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF27E 17776 bytes
SHA-256: 1b25a4820d30e6044c8d4f5594c2a9749c94a81335b85ec8819201a9d62b7721
font_02_sfnt_off00011f8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F8B 10968 bytes
SHA-256: 1a367692e7574e9399834718793ff39ef2c6c116e109894312c28c15e3ba03b2

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