Malicious PDF — malware analysis report

Static analysis result for SHA-256 f84b4f8e432bcb31…

MALICIOUS

PDF

87.7 KB Created: 2021-07-16 05:17:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c93e434de24b9e758b93d83ec40bd6fb SHA-1: 73bf7d84fce2c82a991e6269241ed77286801266 SHA-256: f84b4f8e432bcb314d535b642c9cb6079af3edb2292c922285a566cd47961905
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous compromised WordPress upload directories, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded URLs are likely used to redirect victims to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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://altinay-law.com/images/file/rokamuzo.pdf
    • https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/a53c37d25f5a8376bb27b744139d2492/nejowene.pdf
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/c4c5ad1fbce1a9c11e64c6e485da2196/kijepivirabunuwewiteliju.pdf
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607822b307b1c---26953220982.pdf
    • http://whs1963.com/clients/7/75/758a827d59fb1c2827eec60421ffdc22/File/96340901662.pdf
    • http://speckrepeg.by/UserFiles/files/17956649810.pdf
    • http://bighost.vn/uploads/userfiles/file/wexamuwu.pdf
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/5678b79c57a14adcc1d93e7fe20ff88c/76011399393.pdf
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/f7a5dc9cb3cf360da634edd14bd90cb0/80066579139.pdf
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/d7df5fd35b6d31b45ac6c708f5a98f7c/bopaxu.pdf
    • https://tortugafilms.ca/adminfiles/file/koxepewobaxipoxebidefiwu.pdf
    • http://thankschicken.com/uploads/files/worejozezurenoworera.pdf
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/5c3d813e3c1a9308144bcf46ac885439/zexivuwuliduwexogatuz.pdf
    • http://sterenstein.ru/userfiles/file/14335809835.pdf
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/c2429739a87b8ede5528fbf865800909/86262335598.pdf
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607f01a42e446---lovemunepifubijaje.pdf
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/u53tv9lr0ch6f9humh1cc4nmcf/27027033182.pdf
    • https://dallaslandscapedesign.com/media/files/nokotab.pdf
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160719e64a41a8---kisajumegasemu.pdf
    • https://semineebrasov.ro/printuri-fi/files/delewisatumononugo.pdf
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/078223a5fab18f138a892160e1f72104/90687251194.pdf
    • http://mazurubezpieczenia.pl/zdjecia/fck/file/mawilijenusiriw.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=mm+to+ft
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e120.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE120 16792 bytes
font_01_sfnt_off0000f936.bin
8a3804eed677895997aa480d1270cf522bc3fc679967e10c93740b43e3156802
pdf-font-stream PDF embedded font (sfnt) at offset 0xF936 9564 bytes
font_02_sfnt_off00010dd2.bin
a3c17064939880eebf74c8a74ee86aeb40ba0da3092fe1e009aba7e07aeb989a
pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD2 17364 bytes
font_03_sfnt_off00013b69.bin
72c7e6216d6c6dbc7c8ec53ae2e44879983f4179fd3939748fbf48478d828fa4
pdf-font-stream PDF embedded font (sfnt) at offset 0x13B69 16432 bytes