Malicious PDF — malware analysis report

Static analysis result for SHA-256 a81a1e504c6a597b…

MALICIOUS

PDF

96.4 KB Created: 2021-08-19 05:15:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 8b8319e166a1f464efbad50b11ce6ea0 SHA-1: a78031a0d8aa498d15f07d2f322ca64a1c386142 SHA-256: a81a1e504c6a597b2d8cc3e0079a0dd6e7a6258604baf5ed9f3159993115a12a
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body is unreadable, but the heuristics indicate a focus on external URI redirection and link farming.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9896

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://belitour.ir/basefile/belitourir/files/92254796299.pdf In PDF document text
    • https://zemiigori.com/uploads/file/lutagisanaxubisef.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/58474d9e494c6fa2458bdc9a8deb6d06/gomoketurif.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///56697598035.pdfIn PDF document text
    • http://coytex.net//ckfinder/userfiles/files/fabiwumutufo.pdfIn PDF document text
    • https://svarovanijelinek.cz/ckfinder/userfiles/files/4898925121.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ddfc355c2c0---duwufeva.pdfIn PDF document text
    • http://taeguektour.com/FileData/ckfinder/files/20210817_867204D88A955107.pdfIn PDF document text
    • https://tradingphrases.net/userfiles/files/47217877758.pdfIn PDF document text
    • http://maynenkhiinverter.com/media/ftp/file/jojewulage.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8da805c04f---gitivuxakulavog.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7c34ab54e0---gawisexonijagolarina.pdfIn PDF document text
    • https://encoregallery.us/wp-content/plugins/super-forms/uploads/php/files/baa2b53f147757c267fbb5c40ba4e065/vevurozojumalagezusabaki.pdfIn PDF document text
    • http://gostinica-domodedovo.ru/files/nofezezak.pdfIn PDF document text
    • https://coatielectronica.com/files/4295146266.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607af12ac082f---22068611459.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fccf98c962---zowajelivebifikema.pdfIn PDF document text
    • http://ccsup.co.th/uploads/ckfinder/files/15163359965.pdfIn PDF document text
    • http://vytvarnyobchod.cz/UserFiles/File/nekefipomiwuzilaker.pdfIn PDF document text
    • http://trungtinjsc.vn/upload/FCK/file/33874310692.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/gl5e2iqjvpbnu3l3gk1qhc8il7/sazekutadenomawa.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/vujidejofi.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/356da64b7432e90690138419ef8ee7ab/fukudate.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/20554855c57423b8e6136a75a080620f/valufetudejip.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16075b74eb5c06---bafabivamunotomu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=the+five+love+languages+for+singles+quiz+pdf+free+downloadPDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/3470dfeeca8ff89884602d1478a19f2f/80891975019.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_off0001129f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1129F 17752 bytes
SHA-256: 447da00004d2d7578315a072e06e1081088c20874f8d908c8af3c77d309c8fb5
font_01_sfnt_off0001413c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1413C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015953.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15953 11100 bytes
SHA-256: 98aac50f2ed995482a48b67f1dc17b123a941675de30cfbb9bbb0e8c49d053b3

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