Malicious PDF — malware analysis report

Static analysis result for SHA-256 979e06abf35568d2…

MALICIOUS

PDF

80.5 KB Created: 2021-09-04 23:38:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 17fdecae98271148d8a0ff6c0d1b42b4 SHA-1: a72f6888627877aa482f773d18c31b31a2bb544e SHA-256: 979e06abf35568d2ac091205d3728e12ac3d127f4c1e9c561802177f81bd476e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains numerous external URIs, many of which point to compromised WordPress sites. This structure suggests the document is designed to act as a link farm, potentially leading users to phishing pages or further malware. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://krisoc.ru/uplcv?utm_term=saving+all+my+love+for+you+chords+pdf PDF link annotation
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/eb182dba8d611601867dbcc103e0306d/36383903131.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b36ca554497---7386306198.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b62a1fe248a705b7bb4e2d30d9625c85/nepivatatozepe.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac8d68490e4---84135886984.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/ss759s71or375iose0v9iha2tc/87717786692.pdfIn PDF document text
    • https://ascend.sut.ac.th/ce/2017/src/plugins/ckfinder/userfiles/files/89763951421.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160765e1f8a1ae---46358317844.pdfIn PDF document text
    • http://netdepphunu.vn/images/userfiles/file/vukirewevozi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b489011103d---xexiwaremigexinikopolo.pdfIn PDF document text
    • http://thegioivaigiasi.com/Images_upload/files/makexip.pdfIn PDF document text
    • http://dansecyr.ca/pdf/file/romuxutarika.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/161236386ccffe---20881604951.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/a1266cf853fa8e0dee174c2e2949d9e5/xebafepelefabojekiw.pdfIn PDF document text
    • https://fonixkoncert.hu/upload/file/renuwikomejamopa.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/hb6q47am8nk3ddqblqo7hks8av/11766513175.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/tikojofonetaroruxovag.pdfIn PDF document text
    • https://wittnebel.dk/file/29737527475.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/3908ed68321e4878d1c3d63b7b15cc17/44469514104.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16082d9ddf3b82---10812838606.pdfIn PDF document text
    • http://dangkydoanhnghiep.org/hinhanh_fckeditor/file/serugaxina.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1611eb7f69cc58---59499241714.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/0332d37f72904727414f1cd1c1d50a60/nigaxufaxavoke.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_off0000ceb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEB0 20060 bytes
SHA-256: bd2fa0dbafdaf41a1f7141d4d367879370d828d51d5296b1828238229f40c41a
font_01_sfnt_off000101cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101CF 11324 bytes
SHA-256: 7b8c37ab72aa4e4ce93447f0a3b55289645b8ce94491a5748bdff61c9c7c8e4b
font_02_sfnt_off00011c08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C08 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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