Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcccf4d9d01ed225…

MALICIOUS

PDF

102.6 KB Created: 2021-06-29 19:04:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0438d6820bbda703bdd9092233c8d6f9 SHA-1: b3b88368af29222393dfedae27ea1cc8aca882e0 SHA-256: dcccf4d9d01ed2254dba51d8d861ce47bd9d46dc2bb518c2970555bcf32c07bc
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting a phishing or malware distribution campaign. The embedded URLs and link farm heuristics indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9773

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://huntic.ru/uplcv?utm_term=care+plan+for+deficient+knowledge PDF link annotation
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607afef548c72---xujagenebijovag.pdfIn PDF document text
    • https://truck-diagnostic.ru/wp-content/plugins/super-forms/uploads/php/files/0cdbe47f0e4ecf72196673225873c2ed/vimixig.pdfIn PDF document text
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/f21323f60f60c61bc84ce842838b0bea/kekegewunoxodasalopu.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c2ae90672e8---84478240012.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/gulelesutuwuvuvamewi.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160daf3a992a2a---sozamuku.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/15698648952.pdfIn PDF document text
    • https://lose-weight.tw/upload/files/fobiveretefuluziwus.pdfIn PDF document text
    • http://suamayin.biz/userfiles/file/bovuni.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/18950402224.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/2074419b1ce5f49d2a56c602b99599fa/78578853607.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bbfed752eaa---sasalasofuxabatufuw.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/71c03ujrkp3k5bqdijllolf2vk/lefaterosevofupet.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a6953a964f3---wulew.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b74cbccfccf---muzeribujiwizotiwutag.pdfIn PDF document text
    • http://domplus.su/userfiles/files/67640948290.pdfIn PDF document text
    • https://www.swissfillon.com/wp-content/plugins/super-forms/uploads/php/files/717760fde3e421ac62fa76164b2f1012/30091816632.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608ad53cc268a---palidumemi.pdfIn PDF document text
    • https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/acefe0289d668f5ead3ea2c71480f659/kapojulijozixodoki.pdfIn PDF document text
    • https://bawwabatrizq.com/userfiles/file/saboxajezukopaxavakaworaf.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/gilugigosokodesisiserima.pdfIn PDF document text
    • https://iaetindia.com/ckfinder/userfiles/files/zuzevemugejupigotoga.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075de1a2e6a1---lifoj.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3dadfa7ccb---89132181612.pdfIn PDF document text
    • https://mides.vn/images/ckeditor/files/30931061532.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a89bf4d840a---96475830232.pdfIn PDF document text
    • https://dolmalatrek.com/userfiles/file/movubuxebemu.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_off00012e34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E34 17524 bytes
SHA-256: 8d0e7432a405c495768501b12730fbb9720aa3df452f96d2bbcff522865763b0
font_01_sfnt_off00015bec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BEC 10836 bytes
SHA-256: 2c4172cde629d29f0202608e3faaef0897406195b2f00c10dfd6a6c03ec931fd
font_02_sfnt_off000174e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x174E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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