Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f40aa01206dde91…

MALICIOUS

PDF

81.5 KB Created: 2021-07-18 04:32:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cce313b6c80673a0451dad469e89cc2c SHA-1: 6dda2ec560decc09fbb3bd45c40e804e61ed9f81 SHA-256: 4f40aa01206dde91fb10d1641a5f20044b4a6c1522eb1e5a9f5f914147db33de
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous compromised websites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document's structure and numerous external links are consistent with a tactic to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607c4cc26b8a5---57804969715.pdf
    • http://wpklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/suguwefurivax.pdf
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160aab191d494f---bedesitevamiragux.pdf
    • http://xn--l3cbpp3gh4a5g5c.com/userfiles/files/fivilawidegavej.pdf
    • http://wtmongolia.com/materials/file/xaladopudizefafogelekozom.pdf
    • http://firewheels.pe/userfiles/file/lukepimufubop.pdf
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/228527426970fcd418df51ea376855c4/50808264237.pdf
    • http://bajajsports.com/userfiles/file/kiroxuji.pdf
    • http://montagnobozzone.it/userfiles/files/dupujosixijosi.pdf
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8ff894a76---66547545692.pdf
    • http://artside.org/data/temp/file/vafonefowutategasomunu.pdf
    • http://colleges-in-tamilnadu.com/FCKeditor/userfiles/file/xozolaluwil.pdf
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/295b90c8070e1e8323716e8940593d1c/sutijowi.pdf
    • https://retta-bg.com/userfiles/gebaxifujafizi.pdf
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160ab649daa838---rasuvoze.pdf
    • http://zaun-produzent.de/userfiles/file/69314087680.pdf
    • http://aahsclassof1978.com/clients/b/b6/b6117739535924054831d33ecd54b00a/File/27881418842.pdf
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/3295ec850a0173274b82d2956b503ed8/ribunatuxunas.pdf
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/f2220d9a1fd3d484cf259848c3426f12/44232124750.pdf
    • https://menu2uplus.com/images/file/5426942568.pdf
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16086e62c4e693---xixovawetukabexutexovu.pdf
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c333e7291bb---5888749800.pdf
    • https://tangentemag.com/img/file/belijobepewitofizaludobej.pdf
    • http://greenplanetnepal.com/userfiles/file/vawomewu.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=pin+down+meaning
    • 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_off0000da98.bin
f50cb34b85d15feef7e29a16dbb1d76d07e65d291366815428b0d0d23c6db99f
pdf-font-stream PDF embedded font (sfnt) at offset 0xDA98 17940 bytes
font_01_sfnt_off000108b1.bin
4368926cd2e6a5f1fd0c3c9cc54254dd1fabd098606d25237e5e7899714fe80a
pdf-font-stream PDF embedded font (sfnt) at offset 0x108B1 10268 bytes
font_02_sfnt_off00011f8b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11F8B 16792 bytes