Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc011be69e44174a…

MALICIOUS

PDF

80.8 KB Created: 2021-06-25 19:51:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2ca49fed7007da4294f414382da133e2 SHA-1: 01b7b544ee54df8edd456a75f79816c42f39d350 SHA-256: fc011be69e44174af0a686ea250295af9f468f50cc771a88560fcba114e0e0e7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV. It contains numerous links pointing to compromised WordPress sites, suggesting it's part of a link farm designed to distribute malicious content or lead users to phishing pages. The presence of these links indicates an attempt to leverage external infrastructure for malicious purposes, likely as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4037

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606c939e3b2d1---5793936706.pdf In PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be88a5e9ace---fezaduvibaromotekagujoga.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/ukkqa7cgs8tmp32sct6auuukdn/xanusudiwijunisomuxu.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086214d011d7---20081907588.pdfIn PDF document text
    • https://zlato-eu.cz/upload/files/73079176886.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ccaea54d27---83230580837.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/a3bfcd3a5e28f498fe05f7e1dc621fb0/dofuremavi.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/5f6903b232cf5cdce0a2eb1909e73d83/bupegiwosolelap.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16090f2d2de68d---16438140247.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16096efc8d97e9---visalanunovixeb.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095ba51cfd79---69633657005.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/5a34c065fe922e05d06646009f4396ed/newekuzunezes.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc72853502---26413298903.pdfIn PDF document text
    • http://studioriboldi.eu/userfiles/files/gumexibixuluxaliri.pdfIn PDF document text
    • http://atomleasing.ru/media/File/57760462706.pdfIn PDF document text
    • https://mumegram.com/userfiles/file/29830808218.pdfIn PDF document text
    • https://bloomeng.com/uploads/66058659244.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/300649595045.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b4b1abe9e9b---jitusat.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/ceca9f0354bbbe0cea9ea1d2d1e2ff0e/sunifomofager.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/f24f68a2db57928f6f22465f4a16f76a/58411683198.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=types+of+blood+houndsPDF link annotation
    • 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_off0000e653.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE653 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE65 16112 bytes
SHA-256: efc7ab106ec5d3dab4799179b99d4f683362220602043c7dc7f47cb0ca7e64cd
font_02_sfnt_off00012813.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12813 10460 bytes
SHA-256: 51674e8db134b4493bd600716bd45989332e9235fe807758454687ba44487b1e