Malicious PDF — malware analysis report

Static analysis result for SHA-256 79b7799b0353b78f…

MALICIOUS

PDF

85.9 KB Created: 2021-09-02 22:57:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a5457249c8a2f873f998f3c563f8ae44 SHA-1: b91aaecb07ebfe3740c379b4879add3fea9d9c3f SHA-256: 79b7799b0353b78ff99401bd48a9f36df7aed0194da0e9268fa1964c5879178e
156 Risk Score

Malware Insights

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

The sample is a PDF document identified as malicious by ML classifiers and ClamAV. It contains numerous links pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute malicious content or phish users. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://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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