Malicious PDF — malware analysis report

Static analysis result for SHA-256 40e107005d7d6e44…

MALICIOUS

PDF

89.7 KB Created: 2021-07-05 06:43:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: dcd07fedcaf25d27f46ab9f62b2bb567 SHA-1: 34c7d0ea0e2c8cbc5c7caf07ce2db62da2cb0b78 SHA-256: 40e107005d7d6e4450b5e5ca86c176725abec917b495bea52a9a0fe962fbf7e7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate a phishing or malware distribution intent. Although no scripts were explicitly extracted, the nature of the links and the PDF structure are indicative of malicious redirection tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://drafthe.ru/uplcv?utm_term=imperfect+tense+conjugations PDF link annotation
    • http://saglikligencler.org/files/files/45182604030.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b26a23caa25---71255687187.pdfIn PDF document text
    • https://amursvoidom.ru/media/files/pewubu.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bfdd4c9c1e---ranerirawesulebigotizaf.pdfIn PDF document text
    • http://hrzservices.com/uploadfiles/file/66108755860.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/36311703399.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/cae378562da268aa610cd207d8216a78/rivumukatamebafatasetetes.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/setiuad6b9djc111daegvf6h0q/zogiwevivun.pdfIn PDF document text
    • https://sunnyvale.com/wysiwygfiles/file/71906364622.pdfIn PDF document text
    • http://aostavet.it/userfiles/files/40458498989.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/ns8tvf0nnjqgie6p63kkoatov6/13385993274.pdfIn PDF document text
    • http://pivotal-technologies.com/userfiles/file/tukukutawegomidavu.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/a3qdo8l94l0djnpg3unrmg6016/wosaragipabimusezez.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a703566dd4a---talategaf.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608633f0e8665---43276975429.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb1975ebb3b---vazumiro.pdfIn PDF document text
    • http://eurogeographyjournal.eu/admin/fckfiles/file/27308104737.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/a3199d985b9ce0c752cf04d3319510b2/tifarexoxufelozes.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083340d87de0---12837427637.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607383436b477---vovavexadomokesedorajopo.pdfIn PDF document text
    • http://erdivigado.hu/userkepek/file/xololixubetiwizogoroluruw.pdfIn PDF document text
    • https://rockyshairsalon.com/wp-content/plugins/super-forms/uploads/php/files/1bcvms44utd53kn3hfs54sajp5/pajuvegasegetelenam.pdfIn PDF document text
    • http://chieucoingason.vn/files/27627998583.pdfIn PDF document text
    • http://anipetkingdom.com/webroot/img/files/63522499818.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/dorodonimegawigoxaka.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e154.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE154 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f96b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF96B 10960 bytes
SHA-256: 34ca01c8d456c649d03a5ba1eb82224008899450d03990edba0594df0153b08c
font_02_sfnt_off000112cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112CC 16596 bytes
SHA-256: ad5b47d9edd1719db52eb05f937d654597d02293ca787a29579ad2f79ffdb0fa
font_03_sfnt_off00012915.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12915 18504 bytes
SHA-256: a8f6e1f7808b09629ee699b39c22943549fb063aba372a9f47f1d12834d0ae03

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