Malicious PDF — malware analysis report

Static analysis result for SHA-256 134702a9797379a4…

MALICIOUS

PDF

65.7 KB Created: 2021-07-21 22:10:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 4f161f207d6e78776b157f5150356b5e SHA-1: 644c185048ce0a0bb04fad8c4593d695da41ddc5 SHA-256: 134702a9797379a4c96456d58ea135cd538cf8e6730fbe26b7df478230b5ee94
154 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised CMS upload directories and disposable hosting, indicative of a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, and the document body was unreadable binary data, making the link farm the primary indicator of attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6824

Heuristics 5

  • 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
  • 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://aarogyamedico.com/userfiles/file/37308138840.pdf In PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/s3eqqb6alhe7skasc0ki2746gh/zotofitijowudewiw.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/pjnrj8al1rf45766qkpqui986l/tesapalojimilozererapube.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/takubarugukuxaxodevifov.pdfIn PDF document text
    • https://vishalahospitality.com/ckfinder/userfiles/files/zirawugejenesobazafixiki.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/86abdee0581242e3e32e07f1d2ea5656/77711532288.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160838f0781f76---66886271473.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d50f86770e5---wixoxovikak.pdfIn PDF document text
    • https://irish-setter-zucht.info/ckfinder/userfiles/files/gazutitub.pdfIn PDF document text
    • http://lacyfamilyunity.com/clients/2/20/203fd950dafdada58ea32e7b96f0d147/File/pibesamilemizaf.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606e8c019c512---774705434.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609481efa548b---kugululu.pdfIn PDF document text
    • https://lncl.org/ckfinder/userfiles/files/64169814983.pdfIn PDF document text
    • http://carefirstyoungatheartgala.com/clients/b/bc/bc61c41cf33a111e4089ebab1e34a2ce/File/webuwerarobog.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3604777bbc---67036085545.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/c8cc687f5cdbecad62544018f2caab82/baleforego.pdfIn PDF document text
    • http://mariopresto.pl/userfiles/file/4702556468.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160cc2f0a5b6e9---63067584719.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/59cpfk3tl6pprkvfq500lbkof6/79944511285.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/f6ad649e130b9f82738ffc43ecaf802a/tukofigexilibap.pdfIn PDF document text
    • http://phuocthuan.vn/images/pic/file/nunudatidepakoguparip.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/vr06cijhqhn68ovvtv5dj2bid3/26448908557.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b539aed23---sawikigepawufu.pdfIn PDF document text
    • http://hud101.vn/webroot/img/posts/files/74694193545.pdfIn PDF document text
    • http://kaies.cn/upfiles/file/businiv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=advanced+dungeons+and+dragons+treasure+of+tarminPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00010411.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x10411 640 bytes
SHA-256: 110e392413e361cefd8d790f494f5bc6dc95496d4e2f8be96fbb5f7348f4f275
font_00_sfnt_off0000ebff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBFF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1