Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f7892e602995a57…

MALICIOUS

PDF

86.4 KB Created: 2021-07-05 23:43:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 94328ddb4d1f76b4a0b965716b077019 SHA-1: a3abb8bcf8cf92f8d8c80b67b526d5b769aecea5 SHA-256: 8f7892e602995a57dbf4ddfe9658be475e6db72d48d1a8246100bba9b097d96b
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm pointing to compromised WordPress upload storage. The presence of multiple PDF links on disposable hosting and the embedded URLs suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure itself is designed to host and present these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c02332b46c9---pimepajudiw.pdf
    • http://mvpvo.ru/userfiles/file/20592655096.pdf
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/tct397re06btse33kuh99ibs70/femutorobib.pdf
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/6138c4e5ab4412a0ac2e859571c2f3a0/modolevatunozowal.pdf
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af71eef0c19---tewigisomopiwow.pdf
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/83hmhk541a9bvv0g4so0mkij21/42442842448.pdf
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/e0523e873a7a45b966ba486ff4e7fa2b/18910193169.pdf
    • http://texmet.pl/userimages/file/nibexaferejukutobejikaw.pdf
    • http://princeverma.in/uploads/files/90541429107.pdf
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b31cd81e6---25346574262.pdf
    • https://ludifrance.fr/userfiles/file/simedilazavuma.pdf
    • http://hifitness.hu/userfiles/file/34088881940.pdf
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/fobev.pdf
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/6ph6pd3eugjj0bvg5e3tbksdv2/16690144104.pdf
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607061adcf204---mevemusa.pdf
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/u9r92brkl6efsv91hpe5mi0ad8/83721707104.pdf
    • http://kidsjeodo.com/images/files/dibabozegewexoporug.pdf
    • http://icsbc.ru/fuploader//file/47529386927.pdf
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160734a9a9f754---39807826149.pdf
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/n2b2tod44j46o1iabgflns03l6/88218512343.pdf
    • http://eastmoorclassof1970.com/clients/4/43/4343e427eb1b0a0668350338a4d6b623/File/89552320974.pdf
    • https://cape-electronics.com/media/file/palar.pdf
    • https://deltagroup.bg/uploads/file/kulivuxosizibafikapuwa.pdf
    • https://classykitchen.pl/web/uploads/files/19336709851.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=hevc+video+extensions
    • 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_off0000ef22.bin
867f74fa8ca6b4c8ab1ab57eae32e2d28298621c299b9ea9ce5fe4431c1ba8c0
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF22 17564 bytes
font_01_sfnt_off00011d77.bin
7b218964c5331d23a153fc1eff7d5a3330c8f8e18ca26f537f637de182613470
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D77 10212 bytes
font_02_sfnt_off00013482.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13482 16792 bytes