Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5123a8cbeeb1047…

MALICIOUS

PDF

69.7 KB Created: 2021-09-25 13:07:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: eaf75db1df69362fe876b05c43c528e4 SHA-1: 1aafea0ae4711b2617159f700c3b87feaf94e10b SHA-256: b5123a8cbeeb104733cf08c7a6dbd228a28b0d5cb3c1853f771d7afa4fbf3cab
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF was flagged by ML and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. The document body is heavily obfuscated, preventing analysis of its specific content, but the presence of numerous links strongly suggests an attempt to redirect users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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
  • 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://shipsupply.ru/userfiles/files/94767162953.pdf
    • http://195exim.com/datas/files/durabatokifogeboxenub.pdf
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/161370061eaaaa---fegudafitogire.pdf
    • https://kuzeyilac.com/resimler/files/2938639339.pdf
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161444e1eafe78---58854653157.pdf
    • http://cuacuonductudong.com/upload/files/sudisuxarumokezukepame.pdf
    • http://ekonopuntos.com/campannas/file/59924861329.pdf
    • https://weborder.cloud/userfiles/file///12587471849.pdf
    • http://kelkenaghshband.com/app/webroot/img/files/nivutigawi.pdf
    • https://bczenekar.hu/files/file/16359870556.pdf
    • http://igabana.com/upfolder/e/files/20210904093514.pdf
    • http://bestpokeya.com/uploads/files/85418116160.pdf
    • http://airsoft1.ro/files/file/laxose.pdf
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/161495c5072f80---nipupofefok.pdf
    • http://gramercy-grand.ru/files/file/60619567985.pdf
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/3984d57e1f89b933124294b91c5d40a4/gaxopebofugiridifu.pdf
    • https://xn--80aaijz0c.xn--p1ai/ckfinder/userfiles/files/diwoverupajexisenoxodul.pdf
    • http://musicfriend.vn/public/default/ckeditor/files/23971959700.pdf
    • http://koreaseals.com/ckfinder/userfiles/files/wagaguxitutemejepebogef.pdf
    • http://poliambulatorioargentina.eu/userfiles/files/toxikijosovusodutubabe.pdf
    • http://soeurs-scjboran.fr/soeurs/upload/files/3578788838.pdf
    • https://astefin.ro/ckfinder/userfiles/files/lepomixezumunupabupadek.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=transparent+keyboard+android
    • 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_off0000afd2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xAFD2 16792 bytes
font_01_sfnt_off0000c7e9.bin
261cc3ac0650413b720ba161e036826014ef607df5964563fee5f717c404961a
pdf-font-stream PDF embedded font (sfnt) at offset 0xC7E9 10648 bytes
font_02_sfnt_off0000e038.bin
ed53a7ad25ea5d581e76f56522ae4f8035e6b02db10ad00d73092b5dd567e242
pdf-font-stream PDF embedded font (sfnt) at offset 0xE038 16260 bytes