Malicious PDF — malware analysis report

Static analysis result for SHA-256 66561c2b39c40baf…

MALICIOUS

PDF

117.6 KB Created: 2021-07-28 04:54:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 8b1a6fee99d3e085822353dc37d6b41b SHA-1: 05f2e5ddf7e2b9b3324fa9f1c91d5990763f69e1 SHA-256: 66561c2b39c40bafbe41870e188813a407e22136f2c742b5e6a1e61f35e943cb
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites, which are likely intended to redirect users to malicious content. The document body is unreadable, but the heuristic firings strongly suggest a link farm used for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b191e025389---97702927281.pdf In PDF document text
    • http://4998horo.gmmwireless.com/contents/files/32630962104.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ba0fd189867---lenud.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160a89997b204b---18743353588.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160742b850d112---xuziletijanotedizixejifo.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/0b1239ca6c27c1f6b67b82d4afd7a0cb/zamovilowemusuxawoba.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a177be233ec---62957508805.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/tomq27rdu2967j5si2jrnjh4mt/85910308335.pdfIn PDF document text
    • http://randoquad72.fr/userfiles/file/movizaxototibufujezol.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/dodakunotibevumobor.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/7ac03ea32daa1a60864a1e6a169d755d/33108007743.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/202e60bf0fbfec802e036c3c0a486067/19435009490.pdfIn PDF document text
    • https://reitinguok.lt/userfiles/file/wozeraroreweludud.pdfIn PDF document text
    • http://teraval.cz/res/file/bujexeweberuro.pdfIn PDF document text
    • http://warraichmeats.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0d9f25c07---59485907496.pdfIn PDF document text
    • https://www.westcountrystoves.co.uk/wp-content/plugins/super-forms/uploads/php/files/976f85dcdd961a638e9ed52bf16a6c00/97283833312.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8509495b09---96210553272.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/76683254303.pdfIn PDF document text
    • http://schs1968.com/clients/861610/File/vagujo.pdfIn PDF document text
    • https://nestaerospace.com/uploads/file/mixikusovodinopowafek.pdfIn PDF document text
    • http://jinxinghotel.com/uploads/files/kipulipuvenudomupideje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=zubeen+garg+all+assamese+mp3+songPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016978.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16978 17324 bytes
SHA-256: 32b8eba3dc912f71e08456073caf246e7da343c52e544e78aa5495972f1f8af3
font_01_sfnt_off00019707.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19707 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001af1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AF1E 10780 bytes
SHA-256: b40d92e74c831bcdf642bfbef335afa9d697baa5e969401245972d614e1e2a05

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