Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7633f565dc17453…

MALICIOUS

PDF

84.0 KB Created: 2021-06-25 15:56:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e9a3c8c67e97c827dd74e3fbb7c770b9 SHA-1: fe5d5036b124621c3e1d75558f16cb2368cd9783 SHA-256: b7633f565dc174536c736141b3db05d1a634a8f54919aa81c4eec60bab9942ba
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document contains a link farm pointing to multiple compromised WordPress upload directories, suggesting an attempt to distribute malicious content or phish users. The presence of numerous distinct hosts and links indicates a broad distribution effort.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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/1607edeb8518fd---vidigupekuzabolufolufop.pdf
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160ccb0a9c4c91---kopodujug.pdf
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/5f0c4f10e6f279366713f674fb2407a4/tebadebijamiverezusunu.pdf
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/50000342080.pdf
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/a4be7a6e5e3c84f5448ec560affbcc0b/tunebugevab.pdf
    • https://peterdegendt.be/file/paxetome.pdf
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3cfed550bd---67090621133.pdf
    • http://rld-carbon.ru/file/dibulabodoxedezupo.pdf
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/644f042eaa220f34cd3fd7ebd80a57f2/wesizudebibomosegeg.pdf
    • https://www.vbclighting.com/wp-content/plugins/super-forms/uploads/php/files/25153e521050f526bf4cb88b9ce45130/ligulakimadovuroruvoju.pdf
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160779766e4f47---12312627301.pdf
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/3hm29pmuv673d739d5gmmb6icq/87487845361.pdf
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cdaddc6423---97433199695.pdf
    • http://debandhelder.nl/ckfinder/userfiles/files/44531687892.pdf
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aebbb75507a---xazafoseja.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=carrot+and+oat+cake
    • 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_off0000e2cd.bin
a7d90be3252ac9a73b7692ccdc7973175c0ffd37136429bd46832d1efe95298e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE2CD 18152 bytes
font_01_sfnt_off00011312.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11312 16792 bytes
font_02_sfnt_off00012b29.bin
4d3a212d10c100357bda64c8b041206d95e7f754c6eda7c5e494936c65e20732		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12B29 10180 bytes

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