Malicious PDF — malware analysis report

Static analysis result for SHA-256 0259b212cc097ad4…

MALICIOUS

PDF

83.7 KB Created: 2021-07-20 06:30:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 98d0b0cfd4eb9bf89cc7161295ebd22b SHA-1: ad0649db70b09925993ec4497199197f884cc4ae SHA-256: 0259b212cc097ad49f3d8dfbbe527b75e2218d4cd8ad9aa0c661343e682446d2
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The heuristics indicate it functions as a link farm, directing users to multiple potentially compromised websites hosted on disposable domains. The primary attack pattern involves leveraging these links to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://nanyangtextile.com/userfiles/file/8787026745.pdf In PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a69f67a2d8b---98004781362.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/gixumuf.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/87edccgbq5bc4mv13m9gjfkno3/12972345490.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/c6435b1444b256395884fdc433db7e0a/26582383841.pdfIn PDF document text
    • https://whitesal.com/data/images/file/5524_20210713045032.pdfIn PDF document text
    • https://loyallcanada.ca/editor_files/file/tewalomefabovebimixibite.pdfIn PDF document text
    • http://rafaelokazakov.com/file/33388093998.pdfIn PDF document text
    • http://myshopgroup.com/userfiles/files/33272826393.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160e06c766a459---gapigetiv.pdfIn PDF document text
    • http://kovacsoltvaskerites.hu/images/file/38342403896.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/qvac2189nqec5p4p8eqkpfthkd/meroluzaniveledo.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/xaxogejupelebivegebesoro.pdfIn PDF document text
    • http://55thocscompany.com/clients/62662/File/30207545062.pdfIn PDF document text
    • https://store-connector.com/_upload_bilder/_filemanager/file/26203401211.pdfIn PDF document text
    • https://www.westcountrystoves.co.uk/wp-content/plugins/super-forms/uploads/php/files/d935f6ed87e9e3e6a4195ef3d1eebd12/71405735666.pdfIn PDF document text
    • https://bravo-hk.com/userfiles/file/woratinafatuwes.pdfIn PDF document text
    • http://aprendanow.com/wp-content/plugins/super-forms/uploads/php/files/e774d836b50b1b4ec017357371f4a0f3/74861056840.pdfIn PDF document text
    • https://catbasailing.com/upload/fck/file/91750252512.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160772874af570---tibekatujesanodo.pdfIn PDF document text
    • http://fygl.net/uploads/file/300940442004.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/ravurawebokuvaruvami.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084235ab088d---folokumajabigok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=check+car+battery+voltage+with+multimeterPDF 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_off0000e188.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE188 11036 bytes
SHA-256: 5f072c94270b780398f8d3f9e80a4fa827b182d0129be7e16f685cbb8fdf6bd8
font_01_sfnt_off0000fb50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB50 17612 bytes
SHA-256: 323cf014698aacd7befd286ef48d7eae8f2e69aec83e214df138b5cf659ef280
font_02_sfnt_off0001297b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1297B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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