Malicious PDF — malware analysis report

Static analysis result for SHA-256 87c2ec3cc67ee9f7…

MALICIOUS

PDF

83.5 KB Created: 2021-07-25 03:44:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 073d998d91bf79672c9e8e6e3cab2dde SHA-1: 157bceb6da0b13c5737a41f22f8b8bec35bfcbd2 SHA-256: 87c2ec3cc67ee9f767d2af34f4a8600386ee11213ef116898305724f0b951230
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, indicating a link farm strategy. The document body is unreadable binary data, suggesting it's not intended for direct user interaction but rather to host malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://suncitygroup.ir/basefile/suncitygroupir/files/3103713721.pdf In PDF document text
    • http://oxigensupplies.com/shipinc/userfiles/files/6734571477.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/e66db2c603782a7cc6ce27c8b86d1f33/bujaxikevumolepasedi.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb6c8d82f9d---90711668597.pdfIn PDF document text
    • http://weberstellen.ch/userfiles/file/togefabajefevizifuwa.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e2788fd5e90---kemuboriripag.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/8a8a2a2fbe9e704787077c9486980b6a/towakamidazepazikodukifo.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/d7vogrobhsp98mrtmjumjugcfc/jigutofozuzukanujobaravab.pdfIn PDF document text
    • http://sevimticaret.net/userfiles/file/webipegojo.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/d572a6ce3e4b332742a31b79d6c404c0/70377196246.pdfIn PDF document text
    • https://craftsmancuttingdies.com/wp-content/plugins/super-forms/uploads/php/files/ada2174411970ca5d2b5fda1067e0194/24928183716.pdfIn PDF document text
    • http://utuin.net/files/fckeditor/file/famutelizininolu.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089d010c4e28---76986886440.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607440154b5ca---zibebuzameserabegajufa.pdfIn PDF document text
    • https://lienlacanien.com/img_pages/file/22537139715.pdfIn PDF document text
    • https://samtee.com/admin/images/file/12383380343.pdfIn PDF document text
    • http://ekhoron21.mn/uploads/files/mutuxut.pdfIn PDF document text
    • http://adirondackseafood.com/ckfinder/userfiles/files/bunuxalepapizalotewexuv.pdfIn PDF document text
    • http://phsbulldogs1966.com/clients/8/87/87911cb64b10f66d93d15f7b6e22d365/File/gewikegexemagerabolen.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/09b3e886610e7aa0cbc4f3d05b9e90fa/93833449204.pdfIn PDF document text
    • https://bangvetthuong.com/luutru/files/99420450030.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/r765ghd7am9f5qoknlnt0vb9hi/mejuxovuveduzolutu.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cb9e0d1d0c---bekavazimawusok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=the+importance+of+therapeutic+communication+in+nursingPDF 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_off0000e619.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE619 15932 bytes
SHA-256: 35aa1ea93555522dbdc7996d78d72abb19e1c6434528a207e31a248f88870cae
font_01_sfnt_off00010f1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F1A 10944 bytes
SHA-256: c03c2da2deca583762e33542dfd308f1b086c938e887c3609b37553f20ce7b6d
font_02_sfnt_off00012852.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12852 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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