Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9c691494643e9b6…

MALICIOUS

PDF

76.2 KB Created: 2021-09-08 11:42:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 68bd622e6db2e53ba9160f27820a60ff SHA-1: 4200b865e9df0917b93d0652a9765e4baf00169c SHA-256: a9c691494643e9b6344cf3f137233b7146a0fda4c45d7cab8680a3827ba67583
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to a compromised WordPress upload directory, suggesting an attempt to distribute malicious content or phish users. The presence of numerous unknown URLs further supports this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ab4089d0fe---8893043818.pdf
    • https://datatech-int.com/userfiles/file/23982431033.pdf
    • https://bestofbucerias.com/upload/file/wusamujezawewerivam.pdf
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/e17fr00pa80m34njroticq8eu5/98554230494.pdf
    • http://vitalenzyme.com/uploads/fckupload/file/64087574440.pdf
    • https://asoriofrio.org/ckfinder/userfiles/files/tojudejotanakoduvesikuxe.pdf
    • https://zold-kommando.hu/files/namitejuxudez.pdf
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/a5b7a979135d99f6331ccf6c57f2a589/bolifo.pdf
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/0f59c52d312b526ba00d1a1a45ea837d/rogedesigovajegexupumi.pdf
    • http://ylpqzl.com/ckfinder/userfiles/files/berawipawewokefezodudog.pdf
    • http://www.novosib-sport.ru/ckfinder/userfiles/files/febepizi.pdf
    • http://tincorner.vn/uploads/files/nexiberapapimiwuguxu.pdf
    • http://nuovartea.eu/userfiles/files/gejiluxotetoron.pdf
    • http://ahxxzx.com/userfiles/202105/file/zitefitikubaxirowikepowux.pdf
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160955328c1bdb---83631595181.pdf
    • https://unserbiokorb.ch/userfiles/file/38555142200.pdf
    • http://kor-ra.ru/UserFiles/file/59162754556.pdf
    • http://anandtouristcorporation.com/uploads/84094574938.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=complexo+b+bula+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c68e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC68E 16792 bytes
font_01_sfnt_off0000dea5.bin
6b4711209cf6a519becaf2925dde041ff23a5a7eb6407e33b6ccfd8f564f55d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA5 10472 bytes
font_02_sfnt_off0000f639.bin
dfe4790874f323097af8ad00ffaca9826205d94d4d24ede8d0b103d84eeb8b9e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF639 17660 bytes

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