Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f736c90f445d1c3…

MALICIOUS

PDF

84.8 KB Created: 2021-08-26 08:31:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: ba0f3e6ca37e6dfd3559f4366da0fabc SHA-1: c97392b959f8c39d8a38376dc571e83ce0a93d07 SHA-256: 5f736c90f445d1c33953109aa46407c3d3b5336fc54da047ccbb9df890c00df6
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised WordPress sites and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The file's structure as a link farm suggests it's designed to lure users to external, potentially malicious, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 http://www.bluewhaleline.com/image/upload/File/derog.pdf In PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/cee99a9665009690ec552a9c72cc6e29/8521169244.pdfIn PDF document text
    • http://euroambulans.pl/userfiles/file/finazifogakoki.pdfIn PDF document text
    • http://belgium-ex.com/images/blog//file/85178876373.pdfIn PDF document text
    • https://bloomlight.pl/_bloom/file/74007136564.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609a96f78a2da---73319644853.pdfIn PDF document text
    • http://medicalproduct.hu/images/files/mekekexi.pdfIn PDF document text
    • http://renovator.cz/files/file/60457227313.pdfIn PDF document text
    • http://luvnchrlysenglishtoys.com/clients/861429/File/67504841588.pdfIn PDF document text
    • http://hotelrealerimini.it/userfiles/files/94995767365.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/xixowesuwawobe.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160e83ac2841d9---damiropowamijutibopafapos.pdfIn PDF document text
    • https://www.studioline.ie/ckfinder/userfiles/files/pudiluf.pdfIn PDF document text
    • http://capital96.com/userfiles/file/vulura.pdfIn PDF document text
    • https://smsenerji.com/resimler/files/bufekejutupaziwofaba.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/10d954b9eb50754c612cba2f458cd55f/banuvamujizusazazewinuv.pdfIn PDF document text
    • http://petraifevronii.ru/ckfinder/userfiles/files/gimumamujab.pdfIn PDF document text
    • http://cristal-in.fr/userfiles/file/97571760360.pdfIn PDF document text
    • https://yuss.it/file/59291296486.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/upgdt36qmb2v0nor8i2tsis623/sutawirigirexazitujus.pdfIn PDF document text
    • https://www.hkha.org/ckfinder/userfiles/files/besikelotemejesawopevaso.pdfIn PDF document text
    • http://cuoredicane.it/userfiles/files/rigovaliposasonoj.pdfIn PDF document text
    • https://songhong.info/userfiles/file/jozobirosupovufomil.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/c699aa1e90c1eb17f113e45ab6b469f8/paravuditifonabebobisi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=different+marketing+mixPDF link annotation
    • 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_off0000e9fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9FB 16404 bytes
SHA-256: 6d644eaca3925169eb54b58e2bc703e72b0c610cebcc849af410f882d84de800
font_01_sfnt_off0001143a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1143A 10420 bytes
SHA-256: 29b356abafa2eacdaa55c885fde3f28a13e900b84d299fcdcd7d8a984f750f4d
font_02_sfnt_off00012bdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BDB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1