Malicious PDF — malware analysis report

Static analysis result for SHA-256 1afbccf82f6ac199…

MALICIOUS

PDF

84.5 KB Created: 2021-06-28 09:54:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0ca970121f6b8a5f7600c482fa75f305 SHA-1: d57f3dddb16840ae932668f283983de4ded0b743 SHA-256: 1afbccf82f6ac199d26b27ea9ae5aaaba38a7f6b4605ed2df0194d5ea5317787
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised WordPress sites. These sites host further PDF files, suggesting a multi-stage lure or download mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/3qikh5if9hep1a1um2tmb7j3vt/74126647389.pdf
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c30926cec0b---12652170099.pdf
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/7014cb8d4253898ccf7e2d1fde5cb482/borepeviguzojavederagase.pdf
    • http://veterina-hrib.cz/user-uploads/files/tututub.pdf
    • http://cuspsurgeons.com/userfiles/file/27661206094.pdf
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f40b52c765---lusemifufoke.pdf
    • http://bbbswalkforkids.com/clients/c/cf/cf8d0549bdc9bbdffca8bc0db9808b96/File/16387082194.pdf
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16087ffdf54780---rawikepesutikipulexo.pdf
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/5bb0b8e24d43ecf5af096f43f1c2c633/80824751121.pdf
    • http://holzbau-napetschnig.at/99458917428.pdf
    • https://airbays.com/userfiles/file/zowadi.pdf
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/53eb88e46d7a84d16c998ecdadf5e845/72481098240.pdf
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/bbhibrjjssmuen7o32bid9kvs4/25763983426.pdf
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d9e90e9abb---22191045911.pdf
    • http://wawabed.pl/uploads/userfiles/file/wexoduzore.pdf
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/3205635f6d0da11074263550095964be/56419150204.pdf
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/83de3d65c871aaa0e0270b85c3a226a6/sajef.pdf
    • http://vitanova-cattery.com/upload/file/91086191558.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/2m2kbapupa5qbuevv92do1d710/14704888845.pdf
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160772cf43a469---safoperijo.pdf
    • http://seoulmenu.com/uploads/files/wezasetuvanipoziladobe.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=sample+letter+asking+for+consideration
    • 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_off0000e57b.bin
dc7dd09b9bdfb00879a0a32501cd5df683e55d830881c9ab8c243790f2c653e3
pdf-font-stream PDF embedded font (sfnt) at offset 0xE57B 11128 bytes
font_01_sfnt_off0000ff35.bin
ce804af7153589214d72ebc56fafeb25669b391addd26de21f3a5df7641f7c96
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF35 17336 bytes
font_02_sfnt_off00012ca8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12CA8 16792 bytes