Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d6c6c6ab707577c…

MALICIOUS

PDF

81.7 KB Created: 2021-06-27 15:24:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: c96c2bb2f18c2f44bf948ed2971f6955 SHA-1: c81d7d42700bf983917dde9d2943169a50166f18 SHA-256: 7d6c6c6ab707577c5cc27f74960e236814ca99b838850eac620506b21e4fad97
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous compromised websites, many of which host further PDF files. This behavior is indicative of a phishing or malware distribution scheme, likely delivered as a spearphishing attachment. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/rlbe6a54f8chr1mm6qf9gqf19b/pibumonafesaw.pdf In PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/7lit7632nohrntuul7ojmsmpo7/welemepubinejavekalelu.pdfIn PDF document text
    • http://wisewood50th.com/clients/3/35/35ca2b70ae131fa39667c240906a3fe4/File/sewimizamed.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/guliv.pdfIn PDF document text
    • http://zulassungsservice4you.de/bilder/file/midanujilisuxezagaretema.pdfIn PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070b13a28294---xokaviwarijefawemil.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/6c3ce1c8af03ada80cd7a1fcc909822b/fadebusakikiki.pdfIn PDF document text
    • http://mu-rrrc.com/userfiles/file/pepifowaf.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c93da4d55d7---pimezawodurodofidabubano.pdfIn PDF document text
    • https://roweryelectra.eu/app/webroot/uploads/file/16204818178334.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/2ekl8pkihbjkdu4gv0dqv9s7ec/24335242838.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/90eb6a41a5eeb724eae297ac543af66a/74245430631.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e172a58f17---45025803283.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/filofuxetilixo.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160703e68d2fbf---zamavikejojod.pdfIn PDF document text
    • http://daoltrading.com/userData/board/file/558762336.pdfIn PDF document text
    • https://protradingindia.net/userfiles/file/zatatusudideg.pdfIn PDF document text
    • http://stylekd.ru/files/24535274567.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071d40f34f39---46261571836.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e5c6bdb8a1---xovogup.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///31919862246.pdfIn PDF document text
    • http://stardentalcare.org/userfiles/file/29597985186.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160967f170bc54---zurozejisofip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=350+nm+to+ft+lbsPDF 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_off0000da57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f269.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF269 18216 bytes
SHA-256: 58cdb7462839bb8c41788518d1b647a6a06a770ce9b6a05d5a5d190290e711d4
font_02_sfnt_off00012283.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12283 10360 bytes
SHA-256: 9e125342d69bba81acea879f69c63e4ee375596587797de6a13762b2b5f13f7b