Malicious PDF — malware analysis report

Static analysis result for SHA-256 afe5a2f90e6172b1…

MALICIOUS

PDF

87.3 KB Created: 2021-07-06 20:19:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 2084f4a0cdd6485be03a76949c80a8d8 SHA-1: a9c2c0f2089076a3ca6dde64141ec5cc971232ac SHA-256: afe5a2f90e6172b19358489a034b978d2391e6a900274a71d7b7dcdf6e5d78d6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://medvor.ru/uplcv?utm_term=numerical+reasoning+aptitude+questions+and+answers PDF link annotation
    • https://hfdjet.com/wp-content/plugins/super-forms/uploads/php/files/2b74b2fa3221a9c09cc247d1f36ef525/terixusojipizugek.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/350689d63330ee47ed2cb8fa1ece41e8/tawojiwisesozufa.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae7ce949745---26586983568.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/50896446878.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/76942924416.pdfIn PDF document text
    • http://sh-ruiyangcpa.com/userfiles/file/2021-6///202165651119295.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/hir4s0l3vjaf6n91c96abd1s17/jewipotakevitipajisosux.pdfIn PDF document text
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/2a986106716122be0586e0b2dd2e6a0f/47600312256.pdfIn PDF document text
    • http://servmed.net/userfiles/file/lavozobiwetedib.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/gudetogibitivurized.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/b662c072808a13d26816b95b5ccad583/97618906396.pdfIn PDF document text
    • http://banning64reunion.com/clients/a/a7/a71e9339640f4be667ed55590a288245/File/32045169294.pdfIn PDF document text
    • http://toptoptraining.ru/img/upload/file/66855598477.pdfIn PDF document text
    • http://msinternationalbeautypageant.com/clients/8/8c/8c0f0497d7166b07b5568c04be8084ca/File/94850669393.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607b378d1b241---59766518538.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/16085747baf2c2---kavazipe.pdfIn PDF document text
    • http://poorclarescork.ie/images/fiburipakudavapibazunu.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c199117a4a5---kizifibagibiw.pdfIn PDF document text
    • http://laduses.nl/image/file/77959099295.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/6a1177c8ac3bcf611220ac68936f3fb0/xigixedararonof.pdfIn PDF document text
    • http://grafordexstudents.com/clients/0/05/05b3dbe7dd9dc6f92b523d2b721f2ffd/File/gijunabinagekoxera.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/je6fe9put9unm32e0nqb75qo42/86330155972.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/iia67klejkqgbe61bvqpu5juct/bagilaxugefakokoli.pdfIn PDF document text
    • https://remoteworkerclub.com/wp-content/plugins/super-forms/uploads/php/files/679a066ef1a9e756fdb423ce014871e5/wigenavupi.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/8pju7ausvtau8c0bg8h6vop3u1/53386647751.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608062dd13539---34850538534.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/ace9c3f86f35329e095e958e92095524/50850578477.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160764c3f5f5a3---mufuv.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_off0000f2d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010ae3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AE3 16440 bytes
SHA-256: ae0ec44723040cd60006bb469d1728f069b50a749afe7d9ccd7459b56a20b3e1
font_02_sfnt_off00013568.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13568 11168 bytes
SHA-256: e7530e8b2b32a4e6807e75a5a710a735263aeb4e7d9f2aced9bd5fe106c91897

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