Malicious PDF — malware analysis report

Static analysis result for SHA-256 3079f7985d9fa96d…

MALICIOUS

PDF

92.8 KB Created: 2021-09-06 12:21:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 66df0bf84a06d48e76fd8965a9d5d7a5 SHA-1: d3879181ea2c88d1a3cc452e5d9f389a8487a7da SHA-256: 3079f7985d9fa96d2848834e922db835ed023db57e751ef5a9368df1c5c03b9e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 7

  • 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.
  • 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 https://laborke.ru/uplcv?utm_term=rime+of+the+ancient+mariner+analysis+pdf PDF link annotation
    • http://maximaviajes.com/FCKfiles/file/32556894583.pdfIn PDF document text
    • https://anfauglir.com/images/file/72977134334.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/7d57f6be8598eb8eeb04a4acd2490362/sojugifofezov.pdfIn PDF document text
    • http://ttworld.hu/uploads/content_files/files/mafumelumovu.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/dq6el9isn2o74rqsnhdmro9s85/59344808501.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/48902181193.pdfIn PDF document text
    • http://hoangduy.vn/vn/files/63861097238.pdfIn PDF document text
    • https://photojet.bg/userfiles/file/912879075.pdfIn PDF document text
    • http://fiorenzuolatrack.it/userfiles/files/walagunekagaba.pdfIn PDF document text
    • http://struttur-arch.it/userfiles/files/wuzojelibedu.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/6fo05fofi3p2eqnpufa8jpn4sf/zizazapukeg.pdfIn PDF document text
    • http://foto-klub.dk/userfiles/file/2870920610.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a2b3925ff74---48765254768.pdfIn PDF document text
    • http://aluminial.pnh.pt/js/ckfinder/userfiles/files/78223578665.pdfIn PDF document text
    • http://agama-rc.com/upload/files/lozuxusofe.pdfIn PDF document text
    • https://iqmuseum.mn/uploads/files/46167523700.pdfIn PDF document text
    • http://geoscan.it/userfiles/files/jajuvugun.pdfIn PDF document text
    • http://personnelstrategies.net/userfiles/file/55752020630.pdfIn PDF document text
    • http://valleypainclinic.org/userfiles/file/wirigajutusasunagejemul.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4hmtkjp0m51hastd6rvbogsc17/64527037205.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/mogajasunijeresejijo.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1e422f02b7---209028962.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b0d4dda8d59---30374869210.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_off000104dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104DD 11044 bytes
SHA-256: 3e4a709d611d23fe6dd0d51aa1b7b8ae185a6f6d0a4c03b315317081db6f155a
font_01_sfnt_off00011e65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E65 18116 bytes
SHA-256: a7dc997e69c1195bb4ca9e0a4c862ebd4319e410a4916449b94b1a26295df134
font_02_sfnt_off00014d53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D53 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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