Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfbc618e7b76250d…

MALICIOUS

PDF

84.7 KB Created: 2021-07-08 06:29:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: bd54f96c7cf212fc83b2cbe6d8b0b91c SHA-1: 61528d1d38567b815e4081bff2d6d4d18cde3d57 SHA-256: cfbc618e7b76250d230b8dd3eff5b33181cc1d3ccc274bfb4964d4f8647001b4
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised or disposable domains, suggesting it's used for phishing or distributing further malware. The PDF itself contains no readable content, only obfuscated data, reinforcing its role as a malicious container.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xo-sound.ru/userfiles/file/lawukevutiwexavalisexi.pdf In PDF document text
    • https://rdsdealers.com/ckfinder/userfiles/files/semiwew.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/202a31b1388b10054cf3bbaf36cffae2/nawepugasazutovilo.pdfIn PDF document text
    • https://searchlink.org/userfiles//file/5094423955.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/u5plhta5h16c93l6tv3i9898s4/7743317373.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160876e5bad804---nusekinujewikiku.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073d5bfc5efd---nuvokugakelanep.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a503dfd3080---virosasoveb.pdfIn PDF document text
    • http://www.moyekolodin.com/files/rivat.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/d6b9f40c11b39efbcca228e1927ed8e5/68723107049.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/98754092da341531f0d2f1f67f60df33/mosisatuxufojizubiw.pdfIn PDF document text
    • http://nuitsdartistes.eu/images/file/30728854592.pdfIn PDF document text
    • http://rallyteamwalraven.nl/file/tudaxizukebugagupuvud.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a533f5a5c4b---64517412116.pdfIn PDF document text
    • http://badischer-kunstverein.de/ckfinder/userfiles/files/wazawezubogodanizaki.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/cabd62948595cfb96aeb9e58a0b7199b/37674485460.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/16097efc598933---99785639732.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/b1a6na6m4tvfacuh9ua9lcm19q/gubedife.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/bajixepoxogaseludebu.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096eeeb2e5b2---xozuz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=quality+assurance+and+quality+management+concepts+pdfPDF 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_off0000e887.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE887 11380 bytes
SHA-256: 816295c2fa3af3db66f0001d443892d58e97d49d1305fb7a02c3e43d4ba97fbf
font_01_sfnt_off000102ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102EA 16384 bytes
SHA-256: ddb34159d487db6810dc940213546f49551c75ce2449f8d8820e2c94a0e33c54
font_02_sfnt_off00012d5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D5E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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