Malicious PDF — malware analysis report

Static analysis result for SHA-256 d81565d3d75fddb3…

MALICIOUS

PDF

81.9 KB Created: 2021-08-21 19:44:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 309e9fd9dd3c870a9bb6078fc6bbce6d SHA-1: ad82c92cfc0120f6c00e45b42df0073440c75f76 SHA-256: d81565d3d75fddb3016a76bd617f9baf2ac029f6cd058c6e2afb4142a6f5728d
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a password-protected-archive lure. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://archism.ru/uplcv?utm_term=filme+divertida+mente+completo+dublado+download+gr%C3%A1tis PDF link annotation
    • https://bak.vn/upload/files/56164911353.pdfIn PDF document text
    • https://lifo-sea.com/ckfinder/userfiles/files/noxeditedutamiribalen.pdfIn PDF document text
    • http://dansungsala.com/uploads/files/zotunituki.pdfIn PDF document text
    • http://ash-graphy.com/userfiles/file/xiwogeniwedunutazamudex.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/de75e4d530cfdfa00375a01b8b09baae/bopup.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1608b8785af490---73139386565.pdfIn PDF document text
    • http://henrycrawfordreunion.com/clients/1/19/1929e20d1ffebcad6d8b2a659e9c170d/File/52227336517.pdfIn PDF document text
    • https://atlaskvartir.ua/data/uploads/files/22608312915.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/50108759040.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/ludemanakon.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/d10jni5iqmn6iveaipm124rsmd/nefazofekusoximopudig.pdfIn PDF document text
    • http://bindashnews.com/userfiles/file/2035771418.pdfIn PDF document text
    • http://dui-antidote.com/images/userfiles/file/397827914.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/4d4cb62ab3e41e542707da92f1cbdbc1/vifivujun.pdfIn PDF document text
    • http://pneusmarene.it/images/file/59673184938.pdfIn PDF document text
    • https://footballsod.com/images/ck-uploads/files/xagebinamivikozezupivisof.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/banuwax.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16089a2a19b70a---nibodudibagoxegewa.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/48de76b7fcbb74ed6bf835049e31285f/jututexapibiwodorovoxudef.pdfIn PDF document text
    • http://regalmotors-jp.com/js/upload/files/93428647351.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/48454920262.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d596.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD596 11408 bytes
SHA-256: b16f54823044be18a355102c85d1e7ba78e0ad800bb0cdb52d8180467548c84c
font_01_sfnt_off0000efa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA3 19176 bytes
SHA-256: fa5948008b25cb6a862a7623789b9bc92d3e9eee3ae006c432700288e01f75a4
font_02_sfnt_off00011e80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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