Malicious PDF — malware analysis report

Static analysis result for SHA-256 c28deebf69085e0e…

MALICIOUS

PDF

86.9 KB Created: 2021-07-05 21:45:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e20a237046e72d2fbd1e1be3d4af3576 SHA-1: 446d7b4566b44b9b4222f34b3e030ff55d7eb46f SHA-256: c28deebf69085e0e79c709b725bab7f807a61857228345abe1577bbaf0e41bec
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised WordPress upload storage locations and disposable hosting sites. The presence of numerous external URIs and the nature of the heuristics suggest an attempt to distribute malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609099b0c3326---31383671962.pdf
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/7064462dc11d6c8217629b44376ec1a9/bufuxukedirofufexevode.pdf
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160897716cde57---pekazetepopawulolekemi.pdf
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c2bba530bc---diviwotejuvu.pdf
    • https://vestol.bg/files/file/94639373496.pdf
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a3eedda3a5d---zomuvedabijuwilixo.pdf
    • http://glotecgh.com/upload/editor/file/lokapadopevezegozena.pdf
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1a1f565313---62043411011.pdf
    • http://uitvaartverzorgingsindex.nl/images/uploads/18774361431.pdf
    • https://vietrocknet.org/app/webroot/img/files/nowejasirigimoxikukej.pdf
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/c0ab407dd917722d1b1d6b79e2be8d12/mojovazoxanazuzixomow.pdf
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/06d796ac60931ad53dc8338a5bee308e/60282329914.pdf
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16083c5bb33bc4---visar.pdf
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/vslgo44rgujtu7bhrv34fclj02/gewefaz.pdf
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/16078419c97ad2---47626251857.pdf
    • https://fanaf.com/article_ressources/file/15701867576.pdf
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/ae2a3c0e1703bd322d11b3748f0a057c/repovona.pdf
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071b342379a3---gogumuxenezagixugodov.pdf
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/7d2adfdbe505214c643fa9aed8a24f2b/15614489417.pdf
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ab823cb4c75---34379579547.pdf
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/u4trjuoi8q8bksueqfrj893sl1/12332889244.pdf
    • https://menlopark.com/wysiwygfiles/file/82200331350.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16097bb6e730ce---mozolakabigajosofexusin.pdf
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088b7d0449f5---vaxelumovakebejiv.pdf
    • http://apluskleaning.com/admin/images/file/63938594739.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=marrying+an+immigrant
    • 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_off0000f294.bin
4af906361d61935b5774a9fbb3795d5d517647151dc886dad598921e385a50fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF294 17388 bytes
font_01_sfnt_off00012013.bin
ec5b676bb48925cfcc21201d4e90fb5c0839990abac8f9a6644588d1b0268e3c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12013 10092 bytes
font_02_sfnt_off00013685.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13685 16792 bytes

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