Malicious PDF — malware analysis report

Static analysis result for SHA-256 3801171e4d83c1b9…

MALICIOUS

PDF

89.2 KB Created: 2021-08-23 14:14:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ab34ac2755fcd6bc2f66295176c89a2a SHA-1: 9e9044c12b5d7574f767673ae502323d4f03b760 SHA-256: 3801171e4d83c1b90fc87608669d42288f9ccae233fc9d5fe7ae7af3c83965d4
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of numerous unknown URLs supports the conclusion that this document is part of a larger malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://k-yoga.org/file_upload/spaw_upload/file/20210519133717.pdf In PDF document text
    • http://integrotech.pl/zdjecia/file/97024598475.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/72646faac7a18c2429a207da87ff51d0/57201016578.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/losujoxujuratojux.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/zesiwetoruxudaparatenu.pdfIn PDF document text
    • http://avsa.org/sites/default/files/images/files/pomowekimidawivote.pdfIn PDF document text
    • http://shyjjc.com/v15/Upload/file/20218141753371179.pdfIn PDF document text
    • https://cafesca.org/ckfinder/userfiles/files/62001565599.pdfIn PDF document text
    • http://dobrasekacka.cz/userfiles/file/2989475911.pdfIn PDF document text
    • http://wheatland1971.com/clients/25033/File/25561790717.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1607a7254b5191---kemobukugonifenoxepir.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a54e9caf19d---66267804359.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160cc63088ba35---xifuvejupolepenivapudub.pdfIn PDF document text
    • http://heyibnb.com/CKEdit/upload/files/1863705853.pdfIn PDF document text
    • http://assytekservizi.com/userfiles/files/lopulajukerupo.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/b41f736659588eb1ef851f280ba23aa6/92696546971.pdfIn PDF document text
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/8ce50615117870d93d5135fd19ac147a/36989459997.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160796b5bbe64d---retelej.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/8116b21d8d1e5c0ce32dfc577a7905cc/logob.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/48fp93np4c05jc73rig2cd28i1/22709873354.pdfIn PDF document text
    • https://magazinul-de-instalatii-sanitare.ro/app/webroot/files/userfiles/files/dosurasakav.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/bfd67c3dd47b584f1fb7c31e01b0b9f5/jobakuroma.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=alarum+in+a+sentencePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFA6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B7 17204 bytes
SHA-256: 44d3ecf8b85052b661cee5bd462a4f2a8a1b1c77c1a4e1af0dcb527a04d2fc24
font_02_sfnt_off00011189.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11189 17948 bytes
SHA-256: f4eec788f2e3e065a5e037e979e3aaeec7fcde0ee0d7c1bfa736e27248a1d3b0
font_03_sfnt_off00013f8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F8E 10352 bytes
SHA-256: 18036c26c1fd0e9ea05b603aabb255a315e5a3963adc8627bbd8da60a620e5d5

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