Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6671fad3eb533fb…

MALICIOUS

PDF

99.8 KB Created: 2021-08-30 18:29:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c9f7e859f13c1d6605ad7b6c3e78fc95 SHA-1: 7f9b6b8902a3c8d4752cb15c1aaf1f088d6cd7a0 SHA-256: d6671fad3eb533fbf8a75f3f56f4f7502a0e01350a44612a982e027f46107b6c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF document detected as malicious by ClamAV and an ML classifier. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm or phishing lure. The presence of embedded URLs and the nature of the heuristics indicate the PDF is intended to redirect users to malicious websites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://oniceh.ru/uplcv?utm_term=the+protestant+ethic+and+the+spirit+of+capitalism+chapter+2+summary PDF link annotation
    • https://hostingalani.com/calisma2/files/uploads/nolinanotelewosilopomuder.pdfIn PDF document text
    • http://owtsreunion.com/clients/e/e7/e717deb27d844c69ffc49b2d3c0bb1a5/File/49981164725.pdfIn PDF document text
    • https://hunghiephuylog.com/upload/files/gofojar.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/prg1etn41pinb3h96hdgfsgpm6/pulaliwesumar.pdfIn PDF document text
    • https://kuraniterbiye.com/resimler/files/dobefupaseras.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/pm2suji7lchs08n2asoaf6qqd1/wufakutu.pdfIn PDF document text
    • http://adveotec.com/img/file/bamerexekega.pdfIn PDF document text
    • http://hanasushipickup.com/uploads/files/51249248135.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/43301810258.pdfIn PDF document text
    • https://scalper.ir/data/files/file/pidozoxufezivebezutoruw.pdfIn PDF document text
    • http://hoangnhataudio.vn/media/files/zasozadidivurubirimowu.pdfIn PDF document text
    • http://anupbolivia.com/images/files/zozifagadetifetaroxudi.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a787dee1fb4---tuxafapegowigu.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/npda7jjtq864k3obici6rknvn1/64239479829.pdfIn PDF document text
    • https://mwasafat.com/uploads/files/34193310913.pdfIn PDF document text
    • https://pepsima.biz/files/file/puxumazomuloraxo.pdfIn PDF document text
    • https://cakesandcupcakes.net/userfiles/files/tugolafelusegavidu.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160bf68a05da80---51630114088.pdfIn PDF document text
    • http://studiocinti.eu/userfiles/files/zisikimitiras.pdfIn PDF document text
    • http://thingsantiquesla.com/userfiles/files/teketuluwaminida.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/543adcf8e123aac2f9f332cc855f270d/roferafadexofovipagak.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160c2882659833---zuzelokopepujidew.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c6ed655f528---265132012.pdfIn PDF document text
    • 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_off000120b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000138d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138D0 11180 bytes
SHA-256: 4afc6c675491dadb1c0c31894ee49ea31577b3d3934b5d6c66c55cad7cc6e992
font_02_sfnt_off000152de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152DE 17412 bytes
SHA-256: 528e5e4f3266357633803296e00e0f7c4f2ab77e6c359bbf08fcb6c8c3516774

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