Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcb8ac9857040756…

MALICIOUS

PDF

73.9 KB Created: 2021-09-18 22:25:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 15dc681860c216cd0ff2a8a4ed36de16 SHA-1: ec6b73d81e79a0c963a603e1f71b0ed99d395d23 SHA-256: dcb8ac98570407568bf3b276c3b710c8e86a9de454313fd4a22e5837c7fe2adc
204 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple heuristics indicate it is a phishing lure designed to harvest credentials or MFA codes. The 'SE_MFA_LURE' heuristic specifically points to this functionality. Several URLs point to compromised WordPress sites, likely used to host malicious content or redirect to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/161453d3a73239---94760386996.pdf In PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/161396299ca7b3---41974016447.pdfIn PDF document text
    • https://egyseg.eu/ckfinder/userfiles/files/61243989596.pdfIn PDF document text
    • http://alrehabourhome.com/userfiles/files/pakamibulimigesupufiwil.pdfIn PDF document text
    • http://form4concrete.ru/pics/cont/file/guxafu.pdfIn PDF document text
    • https://bongkartuantakur.com/contents/files/27895623446.pdfIn PDF document text
    • https://tenekedjieva.com/uploads/file/87049861674.pdfIn PDF document text
    • http://lineshare.net/upload/files/20210908041948.pdfIn PDF document text
    • https://hiperaktivite.info/userfiles/files/durona.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613be598885da---pagazasanon.pdfIn PDF document text
    • http://malerbetrieb-malanders.de/Webseite/pics/fotos/1/file/guwoferobibotirufijerep.pdfIn PDF document text
    • https://keyword-lda.pt/site/upload/file/34761419835.pdfIn PDF document text
    • http://m-styleauto.com/js/upload/files/99642440047.pdfIn PDF document text
    • https://hunghiephuylog.com/upload/files/lafilut.pdfIn PDF document text
    • http://locnuocvietmy.com/Images_upload/files/87795424433.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb9bf76830---87407537434.pdfIn PDF document text
    • https://pinkrali.com/calisma2/files/uploads/mozokimesagusuritejabebom.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/6632931051.pdfIn PDF document text
    • https://vnsteeldetailing.com/UserFiles/files/94995005519.pdfIn PDF document text
    • http://thehedgerowchronicles.com/ckfinder/userfiles/files/96722103225.pdfIn PDF document text
    • https://arbormaster.net/uploads/files/4759456172.pdfIn PDF document text
    • https://www.larche-de-jules.fr/ckfinder/userfiles/files/dalesaketojadasefifu.pdfIn PDF document text
    • https://tivicom.vn/upload/files/kogetugexatumeperu.pdfIn PDF document text
    • https://podimercrm.com/img/files/rewejuxukete.pdfIn PDF document text
    • http://air-ned.com/uploads/files/17255624089.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=android+default+password+managerPDF 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_off0000be07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE07 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d619.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD619 16496 bytes
SHA-256: 4ef4809ae1c3200fbae1af757ff9aeefc8777b05c90d1538814e7736b51c08cd
font_02_sfnt_off000100ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100AB 11008 bytes
SHA-256: 89fe9a3a85fe6508e869163190db0335e44291d45158fa17fa7508c819c8da2f

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