Malicious PDF — malware analysis report

Static analysis result for SHA-256 8602b271dd75b796…

MALICIOUS

PDF

89.9 KB Created: 2021-07-07 11:00:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f5329f9466304d91cf8b42ee3a68b0a3 SHA-1: 37c5d2a2b1ce89c11b08814f97f1fdd7e1a911b8 SHA-256: 8602b271dd75b796b55d7bc50d4b11608b36d53f9e8c4d9616b9501bc1d7b6c8
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to external resources, many of which are hosted on compromised or disposable domains, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ClamAV detection and ML classifier also flagged this file as malicious, suggesting it is part of a phishing or malware distribution campaign. The embedded URLs are likely intended to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://dzbnf.com/upload/file///wajerojesatefexu.pdf
    • http://pogservice.ru/userfiles/file/jokevevaxit.pdf
    • http://mppscstudy.com/admin/usercontent/file/98837197659.pdf
    • http://yasaitogo.com/uploads/files/620953864.pdf
    • http://www.findvoters.com/userfiles/file/lazawemefewajoribefuxikaz.pdf
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a53db107a34---50000656772.pdf
    • http://eau-msu.ru/ckfinder/userfiles/files/47933289203.pdf
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609e5f4f3e841---89916496035.pdf
    • https://bitree.ru/ckfinder/userfiles/files/tagekuzipunigimog.pdf
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab5ece1dd52---76282412287.pdf
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/cf76546a261ff4dfd656a0fe92b0dd08/18456483775.pdf
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1609072b195c0a---24954899650.pdf
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/e8d77020671cf0ff2a4718bb9d4058c1/36496443808.pdf
    • http://wintec-samu.hu/uploads/files/26087630842.pdf
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/16084d32e88643---5059260603.pdf
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea5cd3f8e0---pigelu.pdf
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609143d1e6577---563503634.pdf
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/f462e5dd1285caf174e2051045137929/47043916905.pdf
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/970a287599e1b6109f7019111483ccfd/76955314849.pdf
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/a309ba2c7b1717a040503ca891da5d7f/32418500224.pdf
    • https://teenvolunteerhouston.org/wp-content/plugins/super-forms/uploads/php/files/75e109c9c76ba91e55f035be6d224aac/gipijonu.pdf
    • http://namngonviet.vn/user-/files/melezararowifomivewoxo.pdf
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16070472ad307d---34072032023.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=another+name+for+unicellular+organisms
    • 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_off0000fba4.bin
cbda9bad274d8a4818a31372afd55a825f231b8dd0fe775f9d4902720804f5be
pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA4 17488 bytes
font_01_sfnt_off00012977.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12977 16792 bytes
font_02_sfnt_off0001418e.bin
5e0187a5278d8b73cbe8e22ada37fc11571e05dab8248c4da870a01f952c2e45
pdf-font-stream PDF embedded font (sfnt) at offset 0x1418E 10864 bytes