Malicious PDF — malware analysis report

Static analysis result for SHA-256 faa34826d31f1939…

MALICIOUS

PDF

110.7 KB Created: 2021-07-22 14:13:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: be891615fa8bb4bb2d573e6131e40b59 SHA-1: f098c7efcb9325e0215fed6e7dfb527c56276a82 SHA-256: faa34826d31f1939ee415d2910f8bc40a6ac86e53b036e8c2a514be7c05fed0b
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a link farm pointing to numerous compromised WordPress upload directories, suggesting an attempt to redirect users to malicious content. The document body is heavily obfuscated and unreadable, preventing further analysis of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c994972ca4---33466182095.pdf In PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/82636e60ec4749abb66c5fd952d017c0/27310751919.pdfIn PDF document text
    • http://deckdreams.ca/clients/3/34/34055ef41782f8f15ebf372c1e39ecad/File/nunogofof.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/63157674567.pdfIn PDF document text
    • http://oilandgaswork.com/userfiles/file/47719582835.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/0e33lvkk6snuio73jkklcj74sf/89065621375.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/a3abefac351a5bba2d2196e94dfae1e6/zovupeleguvebibifofelew.pdfIn PDF document text
    • http://www.conectadoscomdeus.tv/arquivos/file/nusigetusabutavawo.pdfIn PDF document text
    • http://hopkinshigh62.com/clients/7/77/7764523e397120ad9b09b1da26998858/File/lefoxibezijilibonixuwaz.pdfIn PDF document text
    • https://tahubunting1.com/contents//files/todametoraw.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/00616d9efa5c9a2975e7a9885dc80eeb/lanedemafadozamegaretobij.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606caab4f18e7---99110087900.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082e009e80eb---22065674128.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/1d26aa5679978cf8bda74e05bd27a429/kuxakugamixexukipak.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16072daff06665---40701268601.pdfIn PDF document text
    • https://asharfilalkulfi.com/ckfinder/userfiles/files/51947645981.pdfIn PDF document text
    • https://menu2uplus.com/images/file/98978522213.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/dogukigekudokoreguzukejin.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/52713ff3a48a17302151cd8a6422d537/87916919947.pdfIn PDF document text
    • http://ipost.mn/ckfinder/userfiles/files/pofotiradazo.pdfIn PDF document text
    • http://24cvety.ru/upload/files/58745054440.pdfIn PDF document text
    • https://sunwayhk.com/louis/STARKGROUP/ckfinder/userfiles/files/pizixivezowiradewefanel.pdfIn PDF document text
    • http://tatvideo.ru/ckfinder/userfiles/files/xarinewojazeketavepuxowep.pdfIn PDF document text
    • https://bozoklar.org/ckfinder/userfiles/files/87619347916.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/3fe7a21b1094341b29d185d7f10b2902/13459327150.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=discussion+traverse+surveying+reportPDF link annotation
    • 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_off00014dbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DBE 17140 bytes
SHA-256: 3b6c6e9f4748e2d43eb32865f8b791f01f50aa9d9f5c4cafb573210c9e1c2abd
font_01_sfnt_off00017a8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17A8E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000192a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x192A5 10784 bytes
SHA-256: 9aacb503f6678eb04dd594208045df6aeaf5ef34fe1557661a33a1d3c311cce5