Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fe5c1efff760718…

MALICIOUS

PDF

86.8 KB Created: 2021-06-26 15:00:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 88bbf425f5fec0f6f55c21421032aa74 SHA-1: 75b5fabad82fa7caa4e8bbf795ccca5abe74511f SHA-256: 6fe5c1efff760718180570d6e110a330866e8c8158a8c0404dc44392d19f1267
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting it functions as a link farm to distribute further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The file's structure and numerous external links align with a malicious link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/0a5849ee4b56fa2382e5b14cfa045644/futudiwajiji.pdf In PDF document text
    • https://tedvandergulik.nl/userimages/file/6467176109.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a5f400664e---wakunuboluripajanufobej.pdfIn PDF document text
    • http://videofilm-tv.ru/content/File/73374482224.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/bbfc4d33c5c4fe5097e957c9d3babdf7/xewisije.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-5-4/20210504093200204008.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/lesutijodolodosojalikoge.pdfIn PDF document text
    • https://systematix.pl/userfiles/file/46864970631.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/32f784919c4a5479a8bdebc6d4b323fc/38778102075.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/481186baa13353af9732e61f7dc91291/jexozizowuzubid.pdfIn PDF document text
    • https://mosconi.net/userfiles/file/resuzinepiredomi.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bed2e892547---tikawu.pdfIn PDF document text
    • https://rabudiagnostic.com/userfiles/files/79777104523.pdfIn PDF document text
    • http://leilehua76.com/clients/4/4d/4d80c013f15dbe3c797666a457780dca/File/guvovunexovidefu.pdfIn PDF document text
    • https://balajihighfields.in/userfiles/file/watuwuxusefukorijamimon.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/16087ed36a20e6---25444631227.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bcf9b1c78fa---71921664622.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608caf2dd8799---2965330135.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160859657409ed---jedofugogeduko.pdfIn PDF document text
    • http://thingsantiquesla.com/userfiles/files/jebalorusesovef.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/bbvglvsk9pqaemu9sph2tl6s30/besusudafuluvojovewukow.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/d6f4c86cfbf8f2b64db184f151563aee/65534686620.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/1cn57mpfct04j6io2clh31lhc9/tiwujarigalusovowunenas.pdfIn PDF document text
    • https://ctapigroup3.com/contents//files/jematejabigikerurilibila.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=parent+and+subsidiaryPDF 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_off0000f1a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A4 17060 bytes
SHA-256: 9cbbdb9603da46b4f450e68ed7a6a10e28e1ea5b4f56e125587bb83c97946bc6
font_01_sfnt_off00011e37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E37 10432 bytes
SHA-256: e4734a74205ca90cf4ef38f5ee5a3cc1a5ca551d1ba1828d8e92090a40a16833
font_02_sfnt_off00013603.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13603 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1