Malicious PDF — malware analysis report

Static analysis result for SHA-256 6488151bd3639325…

MALICIOUS

PDF

87.1 KB Created: 2021-06-26 20:41:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cb309a01a3ef4c488c19aaed420c6b4b SHA-1: d59816cf76c8ea4d6bd25d3e71aced51fa3eaf2a SHA-256: 6488151bd3639325b0ebbb1d05219e0d89c4ad8fd758160f0cd78b40e561a377
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories, indicating a link farm designed to distribute traffic or host malicious files. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO abuse. No scripts were extracted, but the structure and URL patterns are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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 https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/b9c1fdbc299525a34642f50ebe65ac9d/2926873748.pdf
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a415898b1bb---gasabilorogusutafipi.pdf
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2eb36c0119---31004347126.pdf
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/dcf6e4f4e782d546ef293d197bc95eb1/zedasasag.pdf
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606caa63ce014---jujejuxufufeguvugex.pdf
    • https://alutat.com/data/file/zinaxotidopevasez.pdf
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160af95deeb1f0---37035034174.pdf
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/465aaec1eba55f964dad98a7474e1bc0/34275604448.pdf
    • https://atcotourismtravel.com/userfiles/file/mepuzebaboviwebozuwana.pdf
    • http://bannermaul.com/userData/board/file/pamubidusorexetoxan.pdf
    • http://bijverhoeven.nl/uploads/files/64604251063.pdf
    • https://uppersanduskyrotary.com/cms/files/File/kidokekozisatidog.pdf
    • http://ozari-ua.com/files/file/vewufezolisaxidagidem.pdf
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160855c1ca3fab---10016956206.pdf
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f72208361b---45730087893.pdf
    • http://timandlor.com/userfiles/file/23693994191.pdf
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc8296e532---jopasexa.pdf
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/a7ba00b0c1bb7932bb88e994705f46d6/48884642221.pdf
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160861b0ea3cc7---53282749585.pdf
    • http://alphabodysupplements.com/newerac2c/userfiles/file/48089260299.pdf
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/733da767ddbea8a3a5a0e60b50cccec6/54275589154.pdf
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083dd53997f7---watofonajepis.pdf
    • https://vannordenvastgoed.nl/userfiles/file/92328343156.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=the+meaning+of+slouching
    • 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_off0000d589.bin
a62ed7342d7a56ec7cd9f30e364e0bbcddeff75525dd6b748ee2ade4bb9dcab1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD589 17816 bytes
font_01_sfnt_off0001042d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1042D 16792 bytes
font_02_sfnt_off00011c3e.bin
30d1612adc8905c66dc562460713e362e3a48bf4f2c93b00b1b67f0c1bd0746b
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C3E 17652 bytes
font_03_sfnt_off000136b1.bin
d2186845b8bd66b768cf308ae0a9a61aedcd0da3e2060c30b322995b2fbdde9f
pdf-font-stream PDF embedded font (sfnt) at offset 0x136B1 10648 bytes