Malicious PDF — malware analysis report

Static analysis result for SHA-256 608e43d1a1f13c47…

MALICIOUS

PDF

146.3 KB Created: 2021-07-27 11:40:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 95a8690887c37f621554ce15692657f0 SHA-1: e69da34059b7df3fd09e3e65eeac8bf0839756dc SHA-256: 608e43d1a1f13c479fe2d4dfc366d0a24ba1d940b405bf96b17f02922abc79d4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites or disposable hosting. The embedded JavaScript likely facilitates the redirection or further payload delivery, contributing to a phishing or malware distribution attack pattern. The presence of numerous links suggests an attempt to obscure the final destination or leverage SEO poisoning tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/842ecc38912a358fedcea30694775f22/13208920567.pdf In PDF document text
    • https://mahae.hu/files/files/sanifozeruzikibus.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609a49a3b12df---75264332427.pdfIn PDF document text
    • https://cape-electronics.com/media/file/pelurizozumunanifukof.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/efc8bb8cd98ef6368b056d286df5de85/85752866952.pdfIn PDF document text
    • https://lotte-ppta.com/beta/assets/file/17297893300.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160e1610733282---97552199171.pdfIn PDF document text
    • http://studiobaldizzone.com/userfiles/files/88177521451.pdfIn PDF document text
    • https://fidelishospice.com/ckfinder/userfiles/files/9345231871.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608bd58820d78---kijiruzekipisanajukaralo.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160c86b3d0f992---35642018126.pdfIn PDF document text
    • http://skiflogistics.ru/userfiles/file/tamusok.pdfIn PDF document text
    • https://wineuniverse.us/userfiles/file/vefudirifilifipa.pdfIn PDF document text
    • http://puppies-4u.com/clients/e/e7/e7f09595da74c05d2059c741134300d2/File/kebuvotiwul.pdfIn PDF document text
    • http://ros.by/ckfinder/userfiles/files/zowojotelatipupiwobinigun.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607de5c9d97e5---16343370977.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/e2fdb3018766a4bf397fe88651c59d7c/79075641092.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/l08qtih6hrgdhr72j2psindhat/65665489222.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a64bf595845---bupurininelixof.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606efdd0048ff---48112912828.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/f31049ffb4e331ac4c73012e0d4ef181/35098000258.pdfIn PDF document text
    • http://dspec-car.com/js/upload/files/68724984175.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/b4lh645aj7ki80susogtum50ei/71897904193.pdfIn PDF document text
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/5a72a01cda8747295bcefb1c68c42bcd/99269853328.pdfIn PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/bba055e8f23621afb05581ad96009a58/10064046722.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=right+triangle+similarity+theorem+worksheet+with+answersPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001bf68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BF68 10892 bytes
SHA-256: a9f32662ba6e7744ff5491f2ebdfe56fc06aedd0593fae1e32fe44cb4ca53ecd
font_01_sfnt_off0001d880.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D880 19240 bytes
SHA-256: 64bfeb277077e8f6ba4c1528d1424aacc14f7e0c7171e28935a4a326fb427b60
font_02_sfnt_off00020bb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20BB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000223c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x223C5 16168 bytes
SHA-256: 34837fdfed7e6dc9e8c1ebc45eabef1064a6e89f8cd536305124148a4af1fb29

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