Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4716a10f172e02c…

MALICIOUS

PDF

94.5 KB Created: 2021-07-25 17:41:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ae4ea543f0e960d4d3a1a487514e6035 SHA-1: 8fdcf496bd2be001b519ca9c8f5ec5bdbeeb01af SHA-256: e4716a10f172e02c1edf90e9f54034055a3e8ae9a956cc1539add58f162d4891
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous external URIs and is identified as a link farm, with many links pointing to compromised CMS upload storage. ClamAV detected this file as Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0, and an ML classifier also flagged it as malicious. The document body is heavily obfuscated and unreadable, suggesting an attempt to hide its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a73fe68c455---biradalepex.pdf In PDF document text
    • http://alexandersorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bufodotarodudeki.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c1d64409cc4---3277760111.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/70861703225.pdfIn PDF document text
    • http://kardelendalgicpompa.com/uploadfiles/file/43746721916.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/c05880cfa1124b77ffad344935d82049/34445370575.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/832b88c9ac14496f366e3ae2289e39f6/45436340869.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/363a5d7708418889a5a0f1306f4ed195/21591893958.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/be6401c4c2108eed6703385dfba8bdeb/fisuzozowubig.pdfIn PDF document text
    • http://biurod9.pl/public/userfiles/file/11023837469.pdfIn PDF document text
    • https://thesaddlebank.com/wp-content/plugins/super-forms/uploads/php/files/le2qmdm9aqoo43ah9u4rgtjqv3/wuvetisixajoxelutoteguli.pdfIn PDF document text
    • http://aptatravel.com/clients/4/48/489dad2d2d8436d4c085fc0ccdc2d1b3/File/surofopiduxuduzuxug.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16070ac3ef1ea6---xonigaxudokemobefed.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a2b5075de02---fugezipuxumixilelepabomu.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/ea2d744ee7b05cad8ff5919df057185b/72611023707.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/a29b35584991fdfe817fba74235f3618/meviperutetaxosuwopakomi.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/dttcmbnvjrn2mq22r6s05h0haa/buzejadezasemibonar.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d9fc7d1169---fijivamawilet.pdfIn PDF document text
    • http://summithigh75.com/clients/867147/File/nijuzuv.pdfIn PDF document text
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/dcf67e8b3548239337962d1f79b6dfbd/2909377787.pdfIn PDF document text
    • http://eventologia.com/userfiles/files/dipozur.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607894c5ab8e4---12809939902.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af86cb8fdbe---sebomixiwazavavufelukorol.pdfIn PDF document text
    • http://jocoseatee.com/userfiles/files/46679689744.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=how+do+you+pass+aptis+testPDF 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_off00010ff1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FF1 16844 bytes
SHA-256: b4c7a27c3a613a5a1b458e483b44696989b53175fd8ccadce60e221b2f1c5424
font_01_sfnt_off00013ba5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BA5 10428 bytes
SHA-256: cbac27b1f3d50362cf0a7b36dd6f2abac3f5ecd06e807d417e587ceab3610727
font_02_sfnt_off0001537a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1537A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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