Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad35c9d2bfbaa295…

MALICIOUS

PDF

92.8 KB Created: 2021-09-04 20:23:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6b675bec8533897374eeca024243b5d6 SHA-1: 402896269a3dbb3eb6a4c551228672bcb2c1dc41 SHA-256: ad35c9d2bfbaa29509055ff2db3d6ba25527b09478f71aca3b2844e953a77ecc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised or disposable domains. While no scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7088

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://doks-films.com/pcms/content/file/javomarux.pdf In PDF document text
    • https://purevdavaa.mn/uploads/ckfinder/files/16713178480.pdfIn PDF document text
    • http://bogelaipigeon.com/upload/file/3349470120.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160929f2bd4eb1---25231867979.pdfIn PDF document text
    • http://studiovalentini.eu/userfiles/files/vejafupawubodixunudesaxur.pdfIn PDF document text
    • http://k-sta.kr/FileData/ckfinder/files/20210703_D3348DDEFA7034F4.pdfIn PDF document text
    • http://fabiocaronearchitetto.com/userfiles/files/vixawo.pdfIn PDF document text
    • https://cjsc.se/ckfinder/userfiles/files/gedifusamafoj.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/9f4p9hl0r0fjja3o63hoclsbur/24838037251.pdfIn PDF document text
    • https://www.treehousecare.org/wp-content/plugins/formcraft/file-upload/server/content/files/16074d32d7ebcf---patuxitasokinupepi.pdfIn PDF document text
    • https://securitydm.com/slicice/file/90331182119.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/dbe75b907666c2e51e996d3c7febed56/43598900761.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/f4b6758b72aece461bde1a9e1669a500/49805862864.pdfIn PDF document text
    • http://3qbuy.com/CKEdit/upload/files/59647364995.pdfIn PDF document text
    • https://camgloberealtor.com/userfiles/file/79423332220.pdfIn PDF document text
    • http://fmmvn.net/userfiles/files/xofen.pdfIn PDF document text
    • http://flexicourse.cz/res/file/73724804958.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/111d16f58aa03beba46c175827fb47f1/dozujulepe.pdfIn PDF document text
    • http://rabotatver.ru/userfiles/admin/vigitutuwogibin.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fa189b5256f---gixiwagudanina.pdfIn PDF document text
    • http://klawiatury-foliowe.pl/_data/file/puzasowikigutazupozav.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/114bde663ae2913a28d974f7fc1f6143/34769580644.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/67361902248.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=citroen+c3+desire+2005+user+manualPDF link annotation
    • 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_off00010bad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BAD 11212 bytes
SHA-256: 59b4b66f4f16c1e19f2dbd8f6b7809cc8a5688d3bec036282121f6259554a576
font_01_sfnt_off00012605.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12605 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013e17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E17 18920 bytes
SHA-256: dbd2be21a0ff40b47553a585815a418e87fba02669d786f4febf7ab65b9f77b6