Malicious PDF — malware analysis report

Static analysis result for SHA-256 13d69eedd6d9fa96…

MALICIOUS

PDF

86.3 KB Created: 2021-06-30 00:24:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 228e677f0f6558374db1eb2c27bd2cc6 SHA-1: 1464d55ec6299ada8e94c8faeb4dda73b1045010 SHA-256: 13d69eedd6d9fa96c666628bb6d04050d92dd6bb9ba5b8a96b2a305794ff3e3a
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many pointing to compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via these links. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the numerous external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://laborke.ru/uplcv?utm_term=cooking+filet+mignon+in+oven
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608302583955e---jadavafabijirekew.pdf
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae2c7061ac---67702458809.pdf
    • http://czapla-dachy.pl/public/images/fck/file/46152365931.pdf
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/63538f0688f3d5458ce48edc84a21286/75612385666.pdf
    • http://kangs78.com/clients/66216/File/wukajowomevuki.pdf
    • http://szakkepzosiklos.hu/upload/file/55989938223.pdf
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/234b8960c75cfb1194e3645847a6341d/wutup.pdf
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/16084e06f0b868---11410223839.pdf
    • http://faw-asia.com/image/upload/files/45624089695.pdf
    • http://bertoniamministrazione.it/bertoni/public/file/larujaluwoz.pdf
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16079d342ef41a---15220590306.pdf
    • http://industra.sk/userfiles/file/fujiluru.pdf
    • http://mav-auto.ru/images/file/gufepujozapagepew.pdf
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3286af296d---tejuxogodisowivom.pdf
    • http://gavinlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/87769946484.pdf
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/jgjn6a0ht092akc5l2dlbipslg/68818840113.pdf
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/bd352362ff2df6df16ca5ffd9c045ec7/vigojezulewe.pdf
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b2cd17f30---75069795788.pdf
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4ef451290---80574158431.pdf
    • http://petersonspann.com/clients/3/32/32c4b2f41fa698b5b938e848169c8dcb/File/47935208327.pdf
    • http://airfa.it/userfiles/file/13363349519.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecf8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xECF8 16792 bytes
font_01_sfnt_off0001050a.bin
2c1a2d675f31b2ef53a8051956003814950f830793ca384fa52e3531c9c7068d
pdf-font-stream PDF embedded font (sfnt) at offset 0x1050A 18236 bytes
font_02_sfnt_off000134f4.bin
568baa5cb4c43479b077864de2df540d8b8588da201d625aeff4f7bd79526a1c
pdf-font-stream PDF embedded font (sfnt) at offset 0x134F4 10316 bytes