Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddd4bc8379bf41b9…

MALICIOUS

PDF

84.2 KB Created: 2021-06-28 04:10:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1292f136e88689179c1f1c670781e3b9 SHA-1: 5856df988b965582ed9af5ac60fbfabe4e46eb17 SHA-256: ddd4bc8379bf41b91714bed756f109880f5963407365ff079d39b376f60a9eff
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous URLs, many of which are hosted on compromised WordPress sites or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://sardavetri.it/userfiles/file/80536306222.pdf
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/f193a509cdc42da77855fe021361a689/12084732516.pdf
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/4b3ka0ansd0jat2l7upkgmuit0/32493012701.pdf
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab4c7830608---78694570012.pdf
    • https://nnkcreations.com/userfiles/file/6805408593.pdf
    • https://its-bulgaria.bg/files/file/pikedafip.pdf
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/44d62ea6d626a646f1bcc54be4d4e209/jaterodamepejub.pdf
    • http://a1-automotivegroup.com/upload/files/29873412542.pdf
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d5101c799c3270b3f7fde5eec986ddee/fatixoxaxanepigida.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/74809350b5566758156eb54ef21ff4ea/zidanolewusetodo.pdf
    • https://aprilboya.com/userfiles/file/13235464234.pdf
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/5cuqick84d21ai3vhf5pbmv8f1/83077756531.pdf
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16073075472169---51372918028.pdf
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/rufatajipanogadepupirif.pdf
    • https://tidaksusah.com/contents//files/27839201034.pdf
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/6365644033ee02a8b6669d8ae3216fb0/jigutemufoni.pdf
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085e788cd667---7379213715.pdf
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983d6ede575---gopajozigezawogirib.pdf
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/160887d3e03a94---guliwadusebu.pdf
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c175c5b23f1---4164260981.pdf
    • https://bangprice.combangprice.com/beta/cms_image/file/miverujufaxesegonezaze.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=vroom%27s+expectancy+theory
    • 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_off0000e4a7.bin
49dede6cf265b02b0cd870d817142221089b08db5525f3da7fc71f1b0a6e340d
pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A7 17220 bytes
font_01_sfnt_off000111dd.bin
9a2441cd25e61a6d97b021a012099bcae387cd00ef97c97d0caa4d46c008e434
pdf-font-stream PDF embedded font (sfnt) at offset 0x111DD 10720 bytes
font_02_sfnt_off00012a71.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A71 16792 bytes