Malicious PDF — malware analysis report

Static analysis result for SHA-256 65c0cfd6e5cb35d7…

MALICIOUS

PDF

87.3 KB Created: 2021-06-26 21:11:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2b0fa1fdacb47c40cd20fe3e633de417 SHA-1: b40973ceff3ffd46fe63c5af83001965f1536b32 SHA-256: 65c0cfd6e5cb35d7eeda6876572bb425d864b698f6cd751719acc83f1aa74147
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://airholic.com/UpFiles/WebEditorFiles/file/petelefikatexu.pdf In PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa9240850f---54631925589.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b2d8a55e82---nalixo.pdfIn PDF document text
    • http://imaginove.eu/data/Files/winigimipesinusotudiwuzof.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/budexi.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094d9dd5dc71---42420112261.pdfIn PDF document text
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/0a2025469e13d3c7fa33241634717767/netaxarakotelaja.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/vumevekovutinadudapuni.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609ba04d1c201---jeridab.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/c9306eaa0fdb79956feb4f705e768652/rajigabujewabusu.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/132d99024c0457cd77ae0a593d3518df/29248643241.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/54617333527.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/46366824020.pdfIn PDF document text
    • http://sbnjl.com/userfiles/files/84125222720.pdfIn PDF document text
    • http://wenxuezj.com/images/File/kudibexipunovoleraxabugo.pdfIn PDF document text
    • http://firegallery.ru/img/upload/bijewokebazitafo.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/2910329385.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/4f0768b091a36ef411695a49d433022d/gapufobajikegonenurevo.pdfIn PDF document text
    • http://abpaluso.com/upload/file/92377046558.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608713c34d84b---98768096419.pdfIn PDF document text
    • https://werbemittelag.ch/upload/file/20947081145.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608cb42510cbf---fefisinowolamalib.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/84366165564.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/19363175794.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=median+and+averagePDF 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_off0000f2b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B6 17816 bytes
SHA-256: 77fab94c99493f945e81a2e9e4d66a9bf1455a8ba8b4290d54a103b8a1738d87
font_01_sfnt_off000121b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000139cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139CF 10048 bytes
SHA-256: a737e9ad2dcdb6030c0d9a8a7c377f51e2412daa2c7f335437971df5a87d29bd

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