Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f84bcaf75b4d73f…

MALICIOUS

PDF

87.0 KB Created: 2021-06-29 14:04:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: f92aa43c66f3f775e0ab35ad064505b5 SHA-1: 6e0163714ded778c2ba17c4cfde084fca23924a4 SHA-256: 2f84bcaf75b4d73f1bf5380df0839891066e3502c8f6a6dc89c4c033117a288d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous heuristics point to the file being a link farm, with many URLs hosted on compromised WordPress sites, suggesting a phishing or redirection scheme. The document body is heavily obfuscated and unreadable, providing no further context on the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://huntic.ru/uplcv?utm_term=the+kissing+booth+three PDF link annotation
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac434072f62---71842567122.pdfIn PDF document text
    • https://ancoraeducacion.com/images/sifasokivedope.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/f793684ae9383512043a2807cd850f73/wemarenol.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/07e4abef7d931a11c41cef5cb00a6b52/7248764846.pdfIn PDF document text
    • http://0-50.ru/userfiles/file/penidijigekemujup.pdfIn PDF document text
    • http://ownlines.com/upfiles/file/kutapamax.pdfIn PDF document text
    • http://nirmalapublicschoolerumely.com/userfiles/file/bagetemovak.pdfIn PDF document text
    • http://bscartridge.com/pic/35531338841.pdfIn PDF document text
    • http://atya.eu/files/file/60901849530.pdfIn PDF document text
    • http://ambulatorioveterinariomariani.it/userfiles/files/bulet.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/4684a79a3d483a76ffdc2d659d242709/wivoxikenakoxozogo.pdfIn PDF document text
    • http://allycatering.com/userfiles/53510268099.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/49874927403.pdfIn PDF document text
    • https://jnfarley.com/wp-content/plugins/super-forms/uploads/php/files/hb7st0k2vjlmqr2nrb1hu0egj7/puvudumuwemupa.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608200d501200---39960133686.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160825a67b956b---58893520986.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/22563871170.pdfIn PDF document text
    • http://aimic.com/userfiles/file/simofuvakedegebino.pdfIn PDF document text
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/c5cac3b191ce8afeddf70124f603a923/gurekavobunawisenipo.pdfIn PDF document text
    • http://hrt-foto.hu/_user/file/mefutidapumujode.pdfIn PDF document text
    • http://projecthouse.bg/uploads/CKfinder/files/xejeketijukelevelel.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF55 10376 bytes
SHA-256: cc0f79cce84664dce11aa58436b05a780029a819739bac0e260e4c661860a549
font_01_sfnt_off000106c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ed7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ED7 18088 bytes
SHA-256: 963edc876d80a95a599fd0ae68296bcbace775752cdd1ce9e33459091a524ef0