Malicious PDF — malware analysis report

Static analysis result for SHA-256 f61cd4ea3bda2e2f…

MALICIOUS

PDF

81.3 KB Created: 2021-09-18 04:32:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 879d939122943da4d9d673e5def32685 SHA-1: 2d33400f29b55c4bcb3a4fee6e490cd24553804e SHA-256: f61cd4ea3bda2e2f707b029b353bc0b2f4450af0e771abf61dbc860e89cb266b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, indicating the document's primary purpose is to act as a lure to these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://coretry.ru/uplcv?utm_term=how+to+share+screen+on+android+mobile PDF link annotation
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16133ac070a9d3---dazog.pdfIn PDF document text
    • http://likuidart.com/files/ckeditor/files/23059175560.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/lbkhtbd6authvsvmmkbutatlu3/53842682228.pdfIn PDF document text
    • http://trans-serwis.com/userfiles/file/39503171334.pdfIn PDF document text
    • http://seibyou-koujien.com/files/files/97849852049.pdfIn PDF document text
    • http://citysoupsbellevue.com/uploads/files/rumoxesuluza.pdfIn PDF document text
    • http://denprokhorov.ru/images/file/22894965830.pdfIn PDF document text
    • http://tlxzkj.com/uploads/file/100555535522.pdfIn PDF document text
    • http://poiskvod.ru/images/file/91350919422.pdfIn PDF document text
    • http://dfwsedan.com/nbloom/fckuploads/file/dekadagote.pdfIn PDF document text
    • http://gemculture.com/userfiles/file/dokebepimivizoxej.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/5a66483dc26e9e76051556a641036e62/gejimufalewonevar.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/66745970924.pdfIn PDF document text
    • http://himalayakebab.com/shipinc/userfiles/files/47640534509.pdfIn PDF document text
    • http://londonjip.com/userData/board/file/59833147599.pdfIn PDF document text
    • http://esenkardeslerinsaat.com/resimlerfiles/biwidudaxos.pdfIn PDF document text
    • http://bananamusic.tw/uploads/files/202109121058016014.pdfIn PDF document text
    • https://balbok.net/admin/ckfinder/userfiles/files/70598713688.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/161301ee842f72---18883741712.pdfIn PDF document text
    • https://florerialafloresta.com/ckfinder/userfiles/files/64783704310.pdfIn PDF document text
    • http://ecilingirler.com/resimler/files/30788352747.pdfIn PDF document text
    • http://nawooelcs.com/upload/userfiles/2021/09/files/210917173713.pdfIn PDF document text
    • https://luckyfood.itweald.com/uploads/files/6134426b7eb94.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16143675a9de3e---41526598436.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_off0000d8bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8BF 17776 bytes
SHA-256: 30acf080f6acda4476f1bb8395a5ecef9d1b58f7460ad1f1e0d8e2e1be79cf67
font_01_sfnt_off00010620.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10620 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E37 10852 bytes
SHA-256: e28fbba3056798647caf0cc57c4aeb551da92c74b37886cebdb0bb0e696fabc0

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