Malicious PDF — malware analysis report

Static analysis result for SHA-256 756ad6033a59f1c2…

MALICIOUS

PDF

86.0 KB Created: 2021-07-05 19:25:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e5571fcda13360da68c71c6024426f5d SHA-1: 8633eee4fd615a24fb12298103229290317edc60 SHA-256: 756ad6033a59f1c2cfcbd81d8d1bb91cde9a3f6344f34a75b933cd78a3609df7
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, a common technique for distributing malicious content or phishing lures. ClamAV detection and ML classification strongly indicate malicious intent, likely related to phishing or malware delivery. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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
  • 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://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/11b36d63363d0039dec58f56240971a7/28091997556.pdf
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/5fhqdqstml2b380hf446dubc05/96135852352.pdf
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/20e4ed4502c1f3315dce8510cd91a383/zurisegadiwe.pdf
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/42b21931c4c540445761bf71effbb1a2/jomeninikidezavelupov.pdf
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/j2likbfen32uu2dhjb82el3iu2/69846889809.pdf
    • http://thibangoto.com/app/webroot/uploads/files/rirapuwutabufivufuvur.pdf
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/70jp5mjet7tfoh50oafthghu74/fukovubaxopib.pdf
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160ddde2104947---14948952101.pdf
    • http://stin-verdon.fr/assets/Image//files/56748214091.pdf
    • https://gerastar.com/userfiles/file/70222963742.pdf
    • http://chinazzjx.com/d/files/kupilavujibisatikukidowek.pdf
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/d3799be27a49bb54351f6aafe3841b54/22075232955.pdf
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16081b75db9e97---sigabek.pdf
    • http://xn----9sbbnbtte4cyg.xn--p1ai/ckfinder/userfiles/files/95295520503.pdf
    • http://adams-gold.ru/archive/image/file/sozolizikotegug.pdf
    • https://metricgroup.it/uploads/file/gugosugewifikulagela.pdf
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607686df2a4e1---nizuvubamonogapidinanug.pdf
    • http://akgikorea.com/file_upload/fck_upfile/file/65142212918.pdf
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/9ggcjveobmdps2mcc8bgjf7rs4/kepaxe.pdf
    • http://pensionpoint.cz/userfiles/files/46667186907.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=shaggy+mane+mushrooms+and+alcohol
    • 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_off0000e986.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE986 16792 bytes
font_01_sfnt_off00010198.bin
58ddc753244023a69fe04eff16ced6696a324925103b5719feba7c25a672a2c6
pdf-font-stream PDF embedded font (sfnt) at offset 0x10198 17976 bytes
font_02_sfnt_off00013051.bin
760c0f510f3cd3ac8c7c0c087e94d6284b7f5eaef2a818ea44c7e3507bbc2d24
pdf-font-stream PDF embedded font (sfnt) at offset 0x13051 10916 bytes