Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0f9e5b4510718c9…

MALICIOUS

PDF

79.8 KB Created: 2021-09-05 06:27:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c15e304bf76e36adde90e20087244f0c SHA-1: 8237d6049ff49a29d3e787846ff6044fc0c8f537 SHA-256: a0f9e5b4510718c95f10550fe79b2be55cd887e359f7cfd8a7adf278d053295a
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and is flagged as a link farm, with many links pointing to compromised WordPress upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns suggest a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://oniceh.ru/uplcv?utm_term=accident+manual+central+railway PDF link annotation
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0fd8951695---78989401130.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/d1bc6a76d0c7u9ld07imm09q72/gasekasilofuvitokijaxip.pdfIn PDF document text
    • http://micronforgacsolo.hu/UserFiles/file/zogevozakaketiruxa.pdfIn PDF document text
    • http://filtrydokoparek.pl/img/all/jaxofuworogemosupiwexufo.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/160f397bb99699---71942154245.pdfIn PDF document text
    • http://bm-shower.com/userfiles/files/90118100160.pdfIn PDF document text
    • http://pvvc.cz/files/butamoberituzizoboteraj.pdfIn PDF document text
    • http://gpmpoolandspa.com/ckfinder/userfiles/files/fobiruz.pdfIn PDF document text
    • http://stewartreunion2020.com/clients/2/2a/2a0d9dcdd57715375c9f4393c24df0f2/File/soluxinufikasaxezusi.pdfIn PDF document text
    • http://93564497.com/userfiles/63462961462.pdfIn PDF document text
    • http://novo-foto.ru/ckfinder/userfiles/files/40222925618.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/821d460d2c2f80b89f2a3856907d4f1b/viroti.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/16113049623ad8---81514653534.pdfIn PDF document text
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/eece7e2668573553afbdee232febdafb/27302269968.pdfIn PDF document text
    • http://ihdbd.org/upload/files/54302984819.pdfIn PDF document text
    • http://yilip.net/userData/board/file/9731529732.pdfIn PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/a551483fdc09effa2402d3413f4d1176/vajiro.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e2486e66334---zasaxewasavubadexajogu.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/84375972620.pdfIn PDF document text
    • http://okulsanmalatya.com/imgup/file/vamisavet.pdfIn PDF document text
    • http://klubbelgickychobrov.sk/editor_uploads/files/46043342451.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/enn8iv6ec7d63i84l5mkb890j8/vuredax.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607db3b2957d9---tonaledolajabik.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_off0000d60a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD60A 16880 bytes
SHA-256: 73cd2702d27d8604f3432e71c2a0cf5771322992e6efa2cbaa7b742509fa1d4f
font_01_sfnt_off00010147.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10147 10524 bytes
SHA-256: e042ee5ee053d308c9ccffa0c7b6636e982ce763ea4743264acb21e2fd63e117
font_02_sfnt_off0001194b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1194B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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