Malicious PDF — malware analysis report

Static analysis result for SHA-256 33440b85a7e0a11a…

MALICIOUS

PDF

89.0 KB Created: 2021-06-26 04:53:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 70cf6cc3fe4e973bbed62446ecb14217 SHA-1: 5a0a5f12eac5c246fd1ee8c9b480ee4735e56497 SHA-256: 33440b85a7e0a11aa89045f2e11dc2c9c7e5f718573b387aa8cf6d2ce08c6dbf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a link farm pointing to multiple compromised WordPress sites and disposable hosting, indicative of a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly suggest malicious intent. The primary purpose appears to be redirecting users to potentially harmful content through a series of links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16081e228d9641---66685895287.pdf In PDF document text
    • http://ff-engineering.com/userfiles/files/wefejonilij.pdfIn PDF document text
    • http://gesundezellen.de/neu/userfiles/file/kugavulediwebavugudije.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089220801393---zapozidavawa.pdfIn PDF document text
    • https://zabulgaria.org/userfiles/file/33917848086.pdfIn PDF document text
    • http://carlaschroyen.com/content_docs/22536639887.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160bb0d00a754c---kurixolujizadigoxadupor.pdfIn PDF document text
    • https://flyingfish-stay.com/userfiles/file/68176198338.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/df7ccb01d2d74b66d7c3dc002723fbe2/86874365345.pdfIn PDF document text
    • https://senhewood.com/d/files/14887997089.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/e73b25c910f656f2a7989d41daa7decf/namijezepegilopaviludinib.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a0499d1dd71---rikutefanawetolefurifuw.pdfIn PDF document text
    • http://ytbozhuo.com/upload/file/211103384123.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16082b8bb3cd96---sosuvusavabefulolavixovum.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///mobepiwogep.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/16077349b81c2f---72788328881.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca0ee4adf2---90256325364.pdfIn PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/3aec9a02de40d939f72483c38236ba06/5369401047.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3be17b2a46---29881094421.pdfIn PDF document text
    • http://tsg-edinstvo.ru/userfiles/file/xijis.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160828c3de7601---2730452835.pdfIn PDF document text
    • https://iominneapolis.com/wp-content/plugins/super-forms/uploads/php/files/e980e9138e10cbb943156d83f0a64ad8/74268448911.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=arizona+animals+and+insectsPDF 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_off0000fb46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB46 16872 bytes
SHA-256: 8d4697b8d01b82c7c2d2b31a16a5493a0f3568983ca2fd476435408c877e69ac
font_01_sfnt_off00012728.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12728 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013f3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F3F 10572 bytes
SHA-256: 1041a9e8edf1aeca7cf46916b4a23695318791206ecdbe2b82e5b089b615c8ef

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