Malicious PDF — malware analysis report

Static analysis result for SHA-256 f281b35ee45a95b6…

MALICIOUS

PDF

93.5 KB Created: 2021-08-10 21:41:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2318ab86c9c68a6a90f84b384a4a7db9 SHA-1: 822f0ec878151ef7d3663367878badfd4f0686f0 SHA-256: f281b35ee45a95b6fd0dcade34b91b42e700045381cab48d24125794ccd64984
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The file's structure and the presence of external links indicate it's likely part of a phishing campaign or a distribution vector for further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

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 https://pixomot.ru/uplcv?utm_term=princ%C3%ADpios+de+direito+individual+e+coletivo+do+trabalho+godinho+pdf PDF link annotation
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b370f53160a---57870648745.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16073caa5f21f6---80746072834.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608e317cab812---74864038687.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/72p61p6nqtpb3f80c0lipjtf63/zanon.pdfIn PDF document text
    • http://saovietgroup.com/upload/FCK/file/72299968232.pdfIn PDF document text
    • http://asianmosaicnyc.com/userfiles/file/12443312302.pdfIn PDF document text
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/160800dea0d3cf---66613830958.pdfIn PDF document text
    • http://equipociclistaugeraga.com/ciclistas/userfiles/file/zitewapiwitefirifi.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0aa258786d---54557884933.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608460eeaca8d---82330034504.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160924db95153f---fimozabowowotob.pdfIn PDF document text
    • http://harryreichert.de/uploaded_pics/News/file/vufom.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f8d6291bf95---domosilulilo.pdfIn PDF document text
    • http://derma-dts.de/files/file/65199570393.pdfIn PDF document text
    • https://watosaphotography.com/app/webroot/userfiles/files/20210728_104459.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/766b2fe545eed7f209945b03967f0616/rorazagaraxojasowegop.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/766c8e9d64828c86079672ce5aab6ceb/senenanosabelefaxa.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c1b7e5df3cf---vinakuvodedub.pdfIn PDF document text
    • http://www.hussco-steel.com/husscofiles/files/95271900607.pdfIn PDF document text
    • http://scuolascifondocortinadolomiti.it/userfiles/files/22766726630.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/0886b0be98fe1e908351b2f1ac337312/69809029006.pdfIn PDF document text
    • http://dush-kz.ru/uploads/fck/file/39752459112.pdfIn PDF document text
    • http://panteres.com/files/files/220283262.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160813bc59cbd2---vewubavopobafi.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d727f5c2f9e---puwerokikezulagevosokapu.pdfIn PDF document text
    • https://study4student.com/cache/fck_files/file/7017735560.pdfIn PDF document text
    • 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_off000101e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101E5 20332 bytes
SHA-256: c84609a81a1fa5ff4cb56dbc8c7d389f39e7edcf64c2dde50082627dd84ea609
font_01_sfnt_off00013281.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13281 11268 bytes
SHA-256: b249ea2a454979c80a61438f3a241159cf48d1127d0a92593aaed85a063131c3
font_02_sfnt_off00014c70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C70 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1