Malicious PDF — malware analysis report

Static analysis result for SHA-256 89fcd6c5c2a0d4ff…

MALICIOUS

PDF

81.1 KB Created: 2021-09-14 13:38:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a8370030984c09cb8bc67a87feb80b01 SHA-1: 42f8a71a8b5f06630dd3292b8d3d4449497f7365 SHA-256: 89fcd6c5c2a0d4ff49b664ca1dd5e48bea25224b8dad025c4e3a1f8128fd782f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as 'Pdf.Phishing.Trojan'. The document contains numerous links to external websites, many of which appear to be compromised CMS uploads or link farms, suggesting a phishing or malware distribution scheme. The primary lure observed in the extracted URLs is a fake 'free download of Google Play Store for Android tablet', indicating a social engineering tactic to trick users into downloading a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://smidgel.ru/uplcv?utm_term=free+download+of+google+play+store+for+android+tablet PDF link annotation
    • http://rialta.ie/userfiles/files/67633388790.pdfIn PDF document text
    • http://apsara.ru/userfiles/file/88998735382.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613c462fb5c0e---89477892361.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/b9a6b5228cdd144eb6ed12f976d30abc/60500406363.pdfIn PDF document text
    • https://flims.atelierleuthold.ch/userfiles/files/bomipewimofow.pdfIn PDF document text
    • http://piemonteforyou.it/userfiles/file/29010654118.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/436170574612ec44c0231c.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f725fb489b---dufeluvafixarimepelomoma.pdfIn PDF document text
    • https://mudraconsultancy.com/uploads/files/xoxavipijuxaxu.pdfIn PDF document text
    • http://ricettebiagi.it/uploads/assets/file/72235039372.pdfIn PDF document text
    • http://ags-sib.ru/ckfinder/userfiles/files/petizobo.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/161346dddaa5dd---81769089463.pdfIn PDF document text
    • https://kaemsp.org/upload/editor/file/lomazo.pdfIn PDF document text
    • http://nissanotogovap.vn/uploads/images/files/diragedajiwonovuwam.pdfIn PDF document text
    • http://bbfrontedelmare.com/userfiles/files/topuwuzogaxogirokewuk.pdfIn PDF document text
    • http://ros-audit.com/i/up/file/jubuvosepixip.pdfIn PDF document text
    • https://buildingexpertsdirectory.com/ckfinder/userfiles/files/50505779143.pdfIn PDF document text
    • https://stiff.pl/ckfinder/userfiles/files/dakanomedutuwozujipev.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/92140730810.pdfIn PDF document text
    • http://duet-czluchow.pl/userfiles/file/ginuvipibederusabu.pdfIn PDF document text
    • http://www.accl-calibration.com/login/ckfinder/userfiles/files/9187944571.pdfIn PDF document text
    • https://euforbiabulgaria.gbinvest.net/uploads/pages/files/69446169546.pdfIn PDF document text
    • http://smart-ventures.ch/upload/Editor_Images/files/14145024900.pdfIn PDF document text
    • http://ctm.it/userfiles/file/kiripojugukuvomepager.pdfIn PDF document text
    • http://shijijiaming.net/filespath/files/20210914092804.pdfIn PDF document text
    • http://murielbellhomes.com/userfiles/files/66377031141.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_off0000db59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB59 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f36b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF36B 15988 bytes
SHA-256: 8a3e47b38ac1ed201a4058963a28d642d83335cf55dd26bef8a6de067216eda8
font_02_sfnt_off00011ca3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CA3 10988 bytes
SHA-256: b2b86ea06ddb2f4d38f4c37b50392e5d16f8250ec444bad2d641ef38530fd5ff

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