Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6e4065bb55e88d2…

MALICIOUS

PDF

80.0 KB Created: 2021-09-13 07:33:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e9d4cf665d60e5ab04819e68653cbc0a SHA-1: e09f571341de32a96a5c6d48283699e83ea8d22f SHA-256: a6e4065bb55e88d2637dd6b3a660b819fb355c8d53385258cc4aa6209766b332
196 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains a link farm with numerous URLs, many hosted on compromised or disposable domains, suggesting an attempt to distribute malicious content or conduct phishing. The 'SE_CLIPBOARD_COMMAND_LURE' heuristic indicates the document may instruct users to copy and paste content into a command-line interface, a common tactic for executing malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://infrive.ru/uplcv?utm_term=android+tv+os+for+raspberry+pi PDF link annotation
    • http://bctlorraine.org/userfiles/file/70188982040.pdfIn PDF document text
    • http://apicn.net/upload/files/80665501388.pdfIn PDF document text
    • https://ratco-hardware.com/Ups/files/94144825457.pdfIn PDF document text
    • http://gyn-ordi.at/myPix/file/13069799756.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/161321312295c0---87339965310.pdfIn PDF document text
    • http://metallpress.ru/files/ronodine.pdfIn PDF document text
    • http://ldkxzzs.com/images/userfiles/file/nibijerebipod.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16137ef83856c8---60616246692.pdfIn PDF document text
    • https://ngenadmin2.nextgenphotosolutions-beta.com/app/webroot/files/file/tubukajirijerigize.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161399719adff7---27485424993.pdfIn PDF document text
    • http://autowagon.it/userfiles/files/junilox.pdfIn PDF document text
    • https://tolgyesvolgy.hu/userfiles/file/66226282790.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161326652e6127---12990953924.pdfIn PDF document text
    • http://vigova.com/Images_upload/files/fododibutikujoti.pdfIn PDF document text
    • http://nemeckystrakac.sk/editor_uploads/files/wituwe.pdfIn PDF document text
    • http://ksklinika.ru/ckfinder/userfiles/files/sebix.pdfIn PDF document text
    • https://0800-707-808.com/upload/ckfinder_temp/files/20210906130315.pdfIn PDF document text
    • http://red-persimmons.com/upfiles/editor/files/77716519166.pdfIn PDF document text
    • https://tspinstruments.com/cache/fck_files/file/3854313083.pdfIn PDF document text
    • https://gruppopolidori.com/upload/image/file/godafolibemofopevijipaleb.pdfIn PDF document text
    • https://foulardfotografando.it/file/81794542824.pdfIn PDF document text
    • https://rent-1.es/ckfinder/userfiles/files/71439114128.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_off0000d273.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD273 10744 bytes
SHA-256: 80c29f5ae816254c19f056d498699c47c7040e92ee03b4736412a5ee9289e917
font_01_sfnt_off0000eb22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB22 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010334.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10334 18448 bytes
SHA-256: 5d6fd8710c16cbf826585031e8b101c904c1a5b39473d8f17bd2c363a2329397

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