Malicious PDF — malware analysis report

Static analysis result for SHA-256 75baa2a43564f367…

MALICIOUS

PDF

91.9 KB Created: 2021-08-19 11:11:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: ba4ef149a6136dc84df072b8f5eb092a SHA-1: 3e0d40c533c5a17953218882b16cab53be6ecdaf SHA-256: 75baa2a43564f3674e12672634638b6cdb5c6c5391f222d1c496317f2400d954
236 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1539 Steal or Forge Credentials

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a fake-CAPTCHA lure and an MFA/2FA-themed lure. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://salwangurugram.com/files/lokujafob.pdf In PDF document text
    • http://royalrep.com/userfiles/files/84239591573.pdfIn PDF document text
    • http://twfbs.com/ckfinder/userfiles/files/fufasabej.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/afbc3aa665512a266053c7d388b5420b/2957675505.pdfIn PDF document text
    • http://yanartextil.com/firma/files/70088670100.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/u3gbhddvaa05oadgtl7cviv7f2/96234379622.pdfIn PDF document text
    • https://promise-land.com/upload/file/kesetexululoxokukebuvusen.pdfIn PDF document text
    • http://yhbinternational.com/userfiles/file/desopuriledakifojosozo.pdfIn PDF document text
    • http://erpsamik.com/ckfinder/userfiles/files/14800196872.pdfIn PDF document text
    • https://ibextrail.com/editor-images/fijuwadibulug.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/f8df128c30f516c9ccab7c067e9ec8ff/57483256583.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608d55cb98424---runinugen.pdfIn PDF document text
    • http://bradleyhillsapartments.com/demo/uploads/contents/file/mobigovajexofaranafiton.pdfIn PDF document text
    • http://herbwaterthailand.com/userfiles/files/65927874375.pdfIn PDF document text
    • http://kondicionery-domodedovo.ru/upload_picture/file/37177142985.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/ail8s09a1m0k0eh7gpvu00e5f6/1397704935.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3daba91e87---56510289135.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075070a628b2---nuvuzujulefu.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609130bcf2a21---vuriwozej.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160803b4d47655---84610595687.pdfIn PDF document text
    • http://jiin-torng.com/uploadfiles/20210727135022.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/660f261852a391b1dc542acc0d74facf/rarurerelorukanazeneze.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/budanewu.pdfIn PDF document text
    • https://sonarmusic.hu/up_image/file/wefasexopubavinavo.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7ab9d52a0---92300937969.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/3454337301.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=generator+diamond+free+fire+pro+apk+downloadPDF 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_off000101f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101F4 10708 bytes
SHA-256: faf16f32c93095fd72b81bf90e84deaf544dd417d74a04ef60ce27afdfd9e18a
font_01_sfnt_off00011a91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A91 17444 bytes
SHA-256: c3605922f6954190057ea88ae0495dccea84f6a2793711e9219a20325a9e833b
font_02_sfnt_off00014887.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14887 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1