Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d7dba812b633dcc…

MALICIOUS

PDF

86.9 KB Created: 2021-09-02 22:57:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 5b8ca81faa2690a76ed14db553104ca0 SHA-1: e982dd2ae7e14278e5fa287e52976ae98877ebf3 SHA-256: 8d7dba812b633dcca803688657c026e0e9f8d3b90fbf1fc758090d4f9b1a06de
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a phishing or malicious redirection scheme. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to lure users to external sites for further exploitation. No scripts were extracted, but the structure and URL analysis point to a link farm designed for phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c955760918---ruxikegobejimezawij.pdf In PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/5232a3c43251e53945fcfb895ab1808c/faponuwes.pdfIn PDF document text
    • https://brod-plovdiv.com/images/48490215298.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/1dd1543073e4387b5e2356846d49afa7/novarozudijo.pdfIn PDF document text
    • http://ladna.pl/user_images/file/govujevaj.pdfIn PDF document text
    • http://machulski.com/public/file/40711874206.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/160e4918ce6d96---bobejuwixetiwamulepogu.pdfIn PDF document text
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c79691dc51---raxaxasedasiz.pdfIn PDF document text
    • https://sunrise-photon.com/upfiles/editor/files/63574750148.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7101a2353c---pomari.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/0ea612d66b890bd21d021278f0a90538/99780697696.pdfIn PDF document text
    • https://shinko-tw.com/UserFiles/file/pazefimokidivutepapik.pdfIn PDF document text
    • http://project-lovcen.me/userfiles/file/40668008793.pdfIn PDF document text
    • http://casaledellasignora.it/userfiles/files/jizogabisanipopekef.pdfIn PDF document text
    • http://gidaero.com/upload/fckeditor/file/vilujidemido.pdfIn PDF document text
    • http://tnetimes.kr/upload/file///somusosudunetajivomiwabe.pdfIn PDF document text
    • http://zhuoer.ltd/userfiles/file/lidadekokanipisidepovereb.pdfIn PDF document text
    • https://ip-pharma.net/data/files/49687053993.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609c3e051bf75---38381634350.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607959c12fef5---zuwipevirizedaguve.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/58047240143.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aeabc4076f3---49419900212.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609a9977dc3fb---37585096585.pdfIn PDF document text
    • http://gioiacompany.net/images/upload/file/8691905788.pdfIn PDF document text
    • https://istocdukkan.com/userfiles/files/59363831468.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=thompson+center+triumph+owners+manualPDF 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_off0000efd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD0 10788 bytes
SHA-256: 63bb1033e3cb06b2bc462baf8c9ac9f528dc09865d041e80979da08315b599bf
font_01_sfnt_off00010891.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10891 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120A3 17280 bytes
SHA-256: 6ca4da634489dd8b22747a2b52e0308ecf4dbdd11948014f6cfa832ec7b69735

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