Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a3b3d677b7e6ba8…

MALICIOUS

PDF

89.7 KB Created: 2021-07-27 23:59:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 115d8332f9826345ea26bf8016923f2e SHA-1: 0d6d3fb5c05b686e4c96d267f7a9620e60fdeb42 SHA-256: 4a3b3d677b7e6ba8f399a0f4c602c340df050988f9ec9e5343dfc611ccf78c65
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised WordPress sites acting as hosting for other PDFs. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via these links. The presence of 'utm_term' parameters in some URLs suggests an attempt to track user engagement with these lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/a7cf61b2dd6468e13d14f48a2db3cd1e/ladikubivuk.pdf
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b46377cba4b---lipeni.pdf
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/bc111e7043f770b054a59ee51c1dc0b4/joranenezig.pdf
    • http://english-life.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160710de0af6a9---niwifakabilorasibasaxo.pdf
    • http://swaminarayangm.org/userfiles/file/bewufev.pdf
    • http://hz-karavany.cz/ckfinder/userfiles/files/19194350848.pdf
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/35dc56ebad3b091e1ec9b1bae8f72c49/4741572213.pdf
    • http://zerosquareonline.com/file/63591209512.pdf
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd42b2b9ff---18165621171.pdf
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160815e59d0133---27371582158.pdf
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c85d3f88930---lixapega.pdf
    • http://basumati.com/app/webroot/ckfinder/userfiles/files/40909032631.pdf
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160926ed5212f2---44256856936.pdf
    • http://exmar.it/foto_fck/file/76900836715.pdf
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d8731afb0---misusagaxojuluxakuzeg.pdf
    • https://granchefpremiumfood.it/file/jobagejosinodaviwomofave.pdf
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/a1638ef5ea556349efa9bf72c145bd92/23268928437.pdf
    • https://ljlconst.com/admin/images/file/4299498845.pdf
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606d564fd9ec8---96973517878.pdf
    • http://frickcontrols.com/uploads/files/lodoragedetijum.pdf
    • http://myucmas.com/userfiles/file/girij.pdf
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/648p9llmi5o35eam4qsrc3j9ii/penesudob.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=java+jdk+1.7+download+64+bit+linux
    • 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_off0000f7ac.bin
bb72a3da5aedcefb73c8fd3ddf88d8d51447265156ea9c8fad3a36585faf98c4
pdf-font-stream PDF embedded font (sfnt) at offset 0xF7AC 17980 bytes
font_01_sfnt_off00012776.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12776 16792 bytes
font_02_sfnt_off00013f8d.bin
c47d1a642f1780e8a13c30d6851a8d8ad61586c04552b6ef8326e2eda6321eef
pdf-font-stream PDF embedded font (sfnt) at offset 0x13F8D 10964 bytes