Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3fe71bae7bde725…

MALICIOUS

PDF

86.4 KB Created: 2021-07-22 23:06:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2207897bce298cef8019a7b284752acf SHA-1: 3c72f3cbe4720a1df80ca0e2742f2a046e465833 SHA-256: d3fe71bae7bde725a2512045deef344dd28c623f7834e0ee22f0c631d1153ece
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior, suggesting the document's purpose is to drive traffic to potentially malicious or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/d58b06141de564809a3f393a850ff45e/98687056067.pdf
    • https://polnische-zaune.de/userfiles/file/10007868590.pdf
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/9vqqut7t5eb6ngu57aes5fs0g6/kozorovamo.pdf
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/iejlcqplrfg52a8oap8udcrhg7/sufimopaxuri.pdf
    • http://nessium.net/userfiles/file/xeburovigi.pdf
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607da80fb7719---29325450912.pdf
    • http://jornalespacoaberto.com/app/webroot/datafiles/editor/files/zaruxatidatixujan.pdf
    • http://devitohomesorlando.com/userfiles/files/70544044668.pdf
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/984bb5642ff4c19d581415ed29a4b0d3/4232860659.pdf
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f47621dafd---novasalipujaxizosu.pdf
    • https://drisraadentalcenter.com/userfiles/file/powupolasojez.pdf
    • http://iphonedown.com/ckfinder/userfiles/files/54439166023.pdf
    • http://cartopack.com/Images/file/3180931484.pdf
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/d2cf00a9dc86cb35c15e409e751991de/65984524190.pdf
    • http://sjar-tech.com/uploadfile/file///2021051906252316.pdf
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e8afd2c70f7---kabomipogupopigaxevip.pdf
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/270f62b2eab1ce440443c88278743fe0/691985553.pdf
    • http://benetalent.com/upload/files/21524601802.pdf
    • https://evermoral.hk/upload/file/1624530619.pdf
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ede488b4cf4---boxobuxejuwefirimed.pdf
    • http://hornets88.com/clients/56662/File/volimeko.pdf
    • https://asset-books.com/userfiles/file/tofogejof.pdf
    • http://kimwendelldesign.com/ckfinder/userfiles/files/64357868743.pdf
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/888601cf9401c7af423b31b0af6c8a7e/nulategugovadoguwijorapon.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=cbse+science+sample+paper+2021
    • 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_off0000ed13.bin
dc4d3e7a6529661969830c8362b1ffd0447510a6a58af83529efa4a79d81a953
pdf-font-stream PDF embedded font (sfnt) at offset 0xED13 10780 bytes
font_01_sfnt_off000105af.bin
a087ba56fb798e6b7310300ef83f9d15be063c68d96b01c6e64a929d30e43ceb
pdf-font-stream PDF embedded font (sfnt) at offset 0x105AF 17508 bytes
font_02_sfnt_off000133f0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x133F0 16792 bytes