Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd8035d1976ccf9b…

MALICIOUS

PDF

104.7 KB Created: 2021-07-06 16:59:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a590581d19a5b0a8a26da5de9cc9bba3 SHA-1: 4b052017ccd17c47c2eb297b96b3616b20c884ee SHA-256: bd8035d1976ccf9b9151b8a05a65356237345e64710b82ccf9d8f88e80906042
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads, suggesting it's designed to lure users to malicious sites. The embedded URLs, many hosted on compromised WordPress sites, reinforce this phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/6b9b4a69c1517680bd0f0f2f993e3865/davugewijejurij.pdf In PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160751e6d4c6da---fuvuxexofasesukeras.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075891985c77---88307764615.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/5437623454.pdfIn PDF document text
    • https://kermoulin.com/userfiles/file/98106963185.pdfIn PDF document text
    • https://aduanaldelvalle.mx/userfiles/file/tizejizovejugibodejidus.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/41i847o8qlo2lq7i7l7tnahij5/bemunobiv.pdfIn PDF document text
    • http://doktor-okonski.pl/uploadimg/file/lizitinilajafibexisin.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607cdb53ea7d6---wuzavomusovofozizinobup.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210514083038_1484764960.pdfIn PDF document text
    • http://ainut.fi/userfiles/file/feponamiwipifetedu.pdfIn PDF document text
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160e3ed71224cb---45708711431.pdfIn PDF document text
    • https://atkarisuli.hu/userfiles/file/voneduxisefosilemepipegi.pdfIn PDF document text
    • https://finances-canada.com/wp-content/plugins/super-forms/uploads/php/files/fded6f15ce3c34b8033af57bc321da60/vodakokexu.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6396f84a0c---kavadexivabizop.pdfIn PDF document text
    • https://eubeer.vn/uploads/files/joxeweputep.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/v5orsf44fgb1q3116u7t1skunr/begiwajilamed.pdfIn PDF document text
    • https://linhquan-group.com/upload/ck/files/zamebikozokum.pdfIn PDF document text
    • http://metall-press.ru/files/5019270547.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/jirafufunexab.pdfIn PDF document text
    • https://khabul.mn/mmpa/userfiles/files/68430510191.pdfIn PDF document text
    • https://nergizleryapi.com/image/files/sasig.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/9f76998c6b2f59042b5db5e4c927c276/29813075875.pdfIn PDF document text
    • https://actorconseil.com/files/file/64000509021.pdfIn PDF document text
    • http://imssp.by/data/images/fxeditor/file/zatidadimutupujijozen.pdfIn PDF document text
    • http://www.federalreserveeducation.org/fed101/policy/basics.htmIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=expansionary+and+contractionary+monetary+policyPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013539.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13539 10876 bytes
SHA-256: 891d15ce2bcded994bf6b3741c9bfacda36972d0bc7d3ff9744d8bad19674bfe
font_01_sfnt_off00014e63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E63 17640 bytes
SHA-256: 1374d1864fbf4cc5b1bade57e907ea757cdf65272c488887529efa08307090f2
font_02_sfnt_off00017cb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17CB3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1