Malicious PDF — malware analysis report

Static analysis result for SHA-256 e36e4ffa710bc3b3…

MALICIOUS

PDF

74.3 KB Created: 2021-09-07 05:27:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2b96af14a13be245e54b0af2544d2168 SHA-1: 88287c2244bcf9b2d759ba2ae32198835dbe95d7 SHA-256: e36e4ffa710bc3b39c0ea7b0b28e9db29fd53e469c989d0ae5e08adaeef0432f
156 Risk Score

Malware Insights

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

The PDF file contains numerous links to external websites, many of which are hosted on compromised CMS upload directories or disposable domains, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the structure and heuristic firings point towards exploitation of PDF vulnerabilities or social engineering to lead users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://agencement-menuiserie-var.fr/stockages/files/9983601160.pdf
    • http://laihoawedding.com/app/webroot/upload/files/26820869576.pdf
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608175d2a0f77---jagusakagejosaw.pdf
    • https://www.surajinformatics.com/wp-content/plugins/super-forms/uploads/php/files/9d6a593cf79fb467dd862d743cadc68a/27671294727.pdf
    • http://alemotta.com/resources/original/file/16740124513.pdf
    • http://sgd42.ru/userfiles/file/52353285109.pdf
    • https://9ja-bet.com/userfiles/file/75508351018.pdf
    • http://babijie.com/upload_fck/file/2021-8-9/20210809045259406620.pdf
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16116e5483b59d---turajogopenovoditotagoz.pdf
    • http://ducthanhtam.com/uploads/userfiles/file/somatobarijenupenub.pdf
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/415d85e515dece526456ec580598226b/pavigivusamirak.pdf
    • http://mintaialuminum.com/d/files/2019502166.pdf
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611aa81ce0c49---koxalidijiravumilelalunur.pdf
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/1faa44652d1af4526ac67dbdbd52f8d5/wonisun.pdf
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082de596b3fc---nozawudotogerofiwezuxu.pdf
    • http://9meclinic.com/ckfinder/userfiles/files/sonaximaziziremusej.pdf
    • http://sl-light.ru/design/img/upload/file/95735734246.pdf
    • http://ctyrkolky-gamax.cz/data/dokumenty/85521236111.pdf
    • http://sentezetutmerkezi.com/upload/ckfinder/files/pukazawagusibijegajis.pdf
    • http://yjsyrj.com/userfiles/file/7706309473.pdf
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c692ca2b96d---wijijusokisikorabixarit.pdf
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/2de7654c201c8287a5d8d20c78448bf7/wipumafajarikawa.pdf
    • http://kotolantopeni.cz/file/62564644143.pdf
    • http://scvumaichiramen.com/uploads/files/fazozezokotenezoge.pdf
    • http://extracam.es/app/webroot/arxius/file/24867022934.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=jpg+to+pdf+high+resolution
    • 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_off0000bf32.bin
ba32d8b38a2568866133697b8d65bcd06900fd352c8d9ec8be43d622785976aa
pdf-font-stream PDF embedded font (sfnt) at offset 0xBF32 10704 bytes
font_01_sfnt_off0000d779.bin
ab8ae97e0ffd8e22eb2f831fc77035a591c04635ce36cf64667cecc26ec97b47
pdf-font-stream PDF embedded font (sfnt) at offset 0xD779 16956 bytes
font_02_sfnt_off00010385.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10385 16792 bytes