Malicious PDF — malware analysis report

Static analysis result for SHA-256 669cb1913bf50497…

MALICIOUS

PDF

182.5 KB Created: 2021-07-29 15:22:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f05f8befa5ab40c9f857154b02d9e7d7 SHA-1: a4dabd17261fadb26d1e7166722ef1ea8b8fb606 SHA-256: 669cb1913bf50497f53d9f957d7d7dcc29e427c92deb066fe4595f0e03a03d48
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. The PDF contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute further malicious content. The presence of embedded URLs and the 'SE_INVOICE_LURE' heuristic further support a phishing or scam-related attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9933

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098475c1bba6---30757125861.pdf In PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/298dbf93d9716ecdcede01e4cd09e69c/38500676199.pdfIn PDF document text
    • http://avision-italia.com/userfiles/files/62344994205.pdfIn PDF document text
    • http://internationalnetworksolutions.net/files/In PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160cb3ab387a16---5912157748.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/vugawunizu.pdfIn PDF document text
    • https://actorconseil.com/files/file/mewogez.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/6cl7fgm25qev69cnb10ug6bsma/81732478255.pdfIn PDF document text
    • https://marwaautorepair.com/nbloom/fckuploads/file/52925900313.pdfIn PDF document text
    • https://angelsforwarriors.org/userfiles/files/25029957217.pdfIn PDF document text
    • http://stl-hk.net/userfiles/51558888878.pdfIn PDF document text
    • http://samnakthodrahassob.com/userfiles/file/tuvudev.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d7fc9107917---10666062248.pdfIn PDF document text
    • https://www.aledrukujemy.pl/ckfinder/userfiles/files/kilum.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082f45cbe924---wukukunivebufegaxiruj.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/dimes.pdfIn PDF document text
    • http://staresecurity.com/userfiles/file/96134811491.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c4148ad6153---12070933339.pdfIn PDF document text
    • http://toyotarent.kr/FileData/ckfinder/files/20210529_E403D35C373DCE66.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/e76131dece1568f5c08ba1cfa359fb26/38334159052.pdfIn PDF document text
    • https://jnfarley.com/wp-content/plugins/super-forms/uploads/php/files/1v99ifkcs6kbsi1amksgnctub3/41433846050.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b24377b9ce---pijakoluj.pdfIn PDF document text
    • https://mednet.mk/public_html/upload/userfiles/file/wesikojukobanunano.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/e7e9ab204219f4e78a5b81a2a8178c30/fofozajefizilaferus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=how+do+you+do+intercompany+reconciliationPDF 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_off00026d0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x26D0B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0002851d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2851D 17196 bytes
SHA-256: 79c85b5dc142007e9ba702ecdab7425d367ea68c4ed7c1109754ca2e1de7ed57
font_02_sfnt_off0002b232.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2B232 10800 bytes
SHA-256: cbb1fef3ec96a28c6e8b6f28163258cb607e0d6613590fa242c487e10d3b58b4