Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac7dd564e94f8ee0…

MALICIOUS

PDF

75.5 KB Created: 2021-09-29 06:16:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 28190b9a5aa6555e598ab71e106e29b4 SHA-1: eec3e68577749c47ccc33dcc65bb882f5dd1a8f0 SHA-256: ac7dd564e94f8ee02e01b159d5c96188312dd955bded16c7c73067fffd56135b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF contains a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The document body was unreadable, but the presence of numerous external URLs strongly supports the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://huntic.ru/uplcv?utm_term=dlna+app+android PDF link annotation
    • https://rosycaffe.com/file/vazipero.pdfIn PDF document text
    • http://nicenpos.com/userData/board/file/zakojuw.pdfIn PDF document text
    • http://phuquytravel.com/nguyenvanlinh/files/bukijezemapemava.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/vb8llb0v5a8q5uajkugt4v3r3u/sukotu.pdfIn PDF document text
    • http://nawooelcs.com/upload/userfiles/2021/09/files/210916050039.pdfIn PDF document text
    • https://kocarbonag.com/luutru/files/74212113664.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/161319027912e3---jarorofofuranapumazoxalid.pdfIn PDF document text
    • http://architettotamborra.eu/userfiles/files/finajanekon.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/161533a88dd007---20336428166.pdfIn PDF document text
    • https://www.kindspring.org/inc/ckfinder/userfiles/files/82486543740.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131c60e94721---najukiwuj.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/83770911632.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134e363be44f---4119419757.pdfIn PDF document text
    • http://servis-hradec.cz/files/file/89037073268.pdfIn PDF document text
    • https://rosebankprimary.co.za/inc/ckfinder/userfiles/files/53892460991.pdfIn PDF document text
    • https://www.gico.ge/ckfinder/userfiles/files/34595598849.pdfIn PDF document text
    • http://ramenhajimetustin.com/uploads/files/1957400635.pdfIn PDF document text
    • https://baxsporthorses.nl/userfiles/file/52468815656.pdfIn PDF document text
    • http://client.diffuse.info/files/belelikulakegerupibusi.pdfIn PDF document text
    • http://kanomax-nsk.ru/images/fegobamugubozamupo.pdfIn PDF document text
    • http://annamsaigonlaw.com/upload/files/41592489832.pdfIn PDF document text
    • http://kfbma.org/files/fck/file/81552993461.pdfIn PDF document text
    • http://proreferee.ru/uploads/ckfinder/files/penumupajubokuwot.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_off0000c098.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC098 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d8ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8AE 9988 bytes
SHA-256: 4fb1afbae9a4b6e3f7df9d90477ae9490721667cf6db3c3d2551b1e309b80799
font_02_sfnt_off0000eebc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEBC 19140 bytes
SHA-256: 2346461f734997ed78a8a5c6b24fc2a447576dd59c2ea29ca08efe94d0bd541e

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