Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab12560c9918e61a…

MALICIOUS

PDF

127.2 KB Created: 2021-09-13 00:05:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3ab544684d0afa57f825a4693e7f32ac SHA-1: 63e5087ab65b84a5f170857c18424cd54fe21cb0 SHA-256: ab12560c9918e61a3e97871ac1ce538bc341327f9d7cbde4ebe9427a5b2d5ca8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to various websites, some of which are hosted on compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, but the structure suggests a link farm designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://inwebjor.ru/uplcv?utm_term=lost+and+found+in+tokyo+full+movie PDF link annotation
    • https://rsun.pro/admin/ckfinder/userfiles/files/jopurimowaxeralu.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/64010860049.pdfIn PDF document text
    • http://rothemtour.com/FileData/ckfinder/files/20210908_7ED5EA0C8D45A6BF.pdfIn PDF document text
    • http://amicissiapiemonteisa.it/userfiles/files/mikimekapujijiguresa.pdfIn PDF document text
    • http://mrspk.com/ckfinder/userfiles/files/rokegufoparexa.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/af3f7aa5331350e916c9c7aa83049946/zodolewiwewikanolupazer.pdfIn PDF document text
    • http://www.optimizecost.com/admin/ficheros_fckedit_subidos/22704649187.pdfIn PDF document text
    • https://bibonatura.com/ckfinder/userfiles/files/59984737363.pdfIn PDF document text
    • http://eaupureinternational.com/userfiles/file/tisixenisiga.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/tqt7psfvum2ouv2ji76284lbr4/72371151219.pdfIn PDF document text
    • http://romento.com/uploaded_files/userfiles/files/56472240143.pdfIn PDF document text
    • https://comtraining.cl/userfiles/files/fezolulu.pdfIn PDF document text
    • https://adtw1.com/ckfinder/userfiles/files/nuwukivimiwefigoxo.pdfIn PDF document text
    • http://lisaarkin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/60564752964.pdfIn PDF document text
    • http://birkhoffhi.com/userfiles/files/vurelevubezo.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c4544db02d---sagorodanekuxis.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fdc6dd3719---padikomib.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/366b3273704ee887f6690964c552cabb/kudugete.pdfIn PDF document text
    • https://www.tzounakos-insurance.gr/ckfinder/userfiles/files/sorujudakodalosose.pdfIn PDF document text
    • http://fulepmark.hu/nyebu/fulepmark/userfiles/file/xepodu.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16133c8d1e4dee---pokir.pdfIn PDF document text
    • http://www.northern-japan.com/image/upload/File/88490003341.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_off00018a0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18A0D 10744 bytes
SHA-256: 05520286b7cb73106ca3809712e46a1c12b08654f0910939c18b4951e25dc417
font_01_sfnt_off0001a2d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A2D0 19960 bytes
SHA-256: c4674bf709624f9bafe06dc2e58dc1e3ad73e50347de59f5ffc473a79cc3b6b2
font_02_sfnt_off0001d715.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D715 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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