Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdd3d8371d6a82a8…

MALICIOUS

PDF

88.8 KB Created: 2021-08-09 23:34:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7de59ffb2d1845b6cebb9ffd77a44da7 SHA-1: bf82a7dc781d0ea18db3cdf1dbb808fe08e83e2a SHA-256: bdd3d8371d6a82a8b18dab1882f2cc8dafd88fbc0973b7bc916a1049128db2bf
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 pointing to compromised WordPress sites hosting other PDF files. This structure is indicative of a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7dea2128d---geniwudumitadoluloj.pdf In PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f36c52a8c4---nisojuwi.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/1414a915ec2b9b62c11aee00ab1fb674/memunibef.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b33864d6b63---gotusubojazosemuzizaxewor.pdfIn PDF document text
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/d0f052d8c788399eecd0ded7102fd6e5/38531106390.pdfIn PDF document text
    • https://dcmheavyequipment.com/admin/images/file/2181766826.pdfIn PDF document text
    • https://lacecinella.com/writable/public/userfiles/file/91720220450.pdfIn PDF document text
    • http://dgone.kr/userfiles/file/20210807224638.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca663a4de4e---dibufoganepivu.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/a23dac2052b590ab3af4579482a456ec/kilane.pdfIn PDF document text
    • http://agriturismolataggiasca.eu/userfiles/files/navafawuzevovukonuvu.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/94712afbadb1ab839b27fb2918a2d2fc/fawarunu.pdfIn PDF document text
    • http://jmvlpslimited.com/ci/userfiles/files/lopofuzaxafuwe.pdfIn PDF document text
    • http://phuocthuan.vn/images/pic/file/29173927598.pdfIn PDF document text
    • http://designklasse.de/ckfinder/userfiles/files/23023247298.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608650505846a---67251504654.pdfIn PDF document text
    • http://biotop-zamosc.pl/userfiles/file/kavivijofeka.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608e391739174---jirumowujelidipogaxod.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160870062aa602---mipovivebisegoname.pdfIn PDF document text
    • https://solidpractise.com/files/userfiles/file/42137834965.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/fb3243b17d5316205f76b0761d9fbcb5/vusononedivoxo.pdfIn PDF document text
    • http://abaj.cz/UserFiles/File/53461526606.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/43051120451.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=manual+m%C3%A1quina+de+lavar+electrolux+12kgPDF 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_off0000f315.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF315 11396 bytes
SHA-256: 5d38778948b02fa7a4e108dc35fd45aced070677461a4da2f3e94245d68b92a9
font_01_sfnt_off00010d25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D25 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012537.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12537 18456 bytes
SHA-256: f62130cf29dab693e7921b8f2025bcd576a705d8c61c77fa4a0a28039ad3771f

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