Malicious PDF — malware analysis report

Static analysis result for SHA-256 572f09a0b0dedd85…

MALICIOUS

PDF

88.3 KB Created: 2021-07-22 12:44:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a9cf51b4b887b5bcaf102445bfa29f8b SHA-1: f671e3a5dd4fc42195c63c53dc6c4b056ff4f2d6 SHA-256: 572f09a0b0dedd85b05195e9c7894cb3ca6ee649e018c880781c89150b16b2b3
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable domains, indicating a link farm designed to lure users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The document body is unreadable, but the heuristic firings and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://18554080.com/userfiles/file/49793703529.pdf In PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/fjbiirp1f2qj8vq5ihfmd3ojm3/bikerojepanowipikigiko.pdfIn PDF document text
    • http://espacioschillout.es/images/admin/file/dujifepakuzebemufasep.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/vt8pb7kv0ra2dtd1kgp3vkr7b3/gefudefadulodijogegi.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160cff9177ee62---vezijuremivovepegemavoz.pdfIn PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/tokmqee4o1u8mkja5q6rbmc5nr/32773334032.pdfIn PDF document text
    • http://myafmc.com/clients/a/a5/a51d49d85de18111a3d718c63a5e5081/File/sexojojoro.pdfIn PDF document text
    • https://clove7.com/userfiles/file/porex.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/5e98ff82aa63463cd5bf06c0a1c4736b/57944389225.pdfIn PDF document text
    • http://memphiscentral1969.com/clients/865565/File/91449615845.pdfIn PDF document text
    • http://abwingscolley.com/uploads/files/63518686623.pdfIn PDF document text
    • https://suma.ca/upload/editor/file/vopezavenapewilufinobe.pdfIn PDF document text
    • http://vandervalk.reviews/app/webroot/files/userfiles/files/79368280800.pdfIn PDF document text
    • http://laboratoriodiprogettazione-ve.it/userfiles/files/rezujozazesuzif.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/9c2c6ed7dbc1d459252585bd508cad62/85776373546.pdfIn PDF document text
    • https://juvelyrikoscentras.lt/Files/file/72894064612.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/2b43cc8e9c101e21d6f98da12582b470/5771957605.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609974ec963fe---57215778558.pdfIn PDF document text
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/5c0abed7673e9ca28efd56b5ea573daf/natarakifalisemipujinimu.pdfIn PDF document text
    • http://bocghedanang.com/media/ftp/file/59749780138.pdfIn PDF document text
    • https://ndmoyun.com/calisma2/files/uploads/vixisefojalezo.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/c7bc7a4e261fc4b0c9b8a998f8d7c049/gutipagitudexezuxedilakor.pdfIn PDF document text
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/bf0bed29b054593e72e330bfdb7a2aad/81470470829.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=thomasites+to+a+new+landPDF 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_off0000f65f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF65F 10460 bytes
SHA-256: c90c54b15b0bc71540c8324fa9b25b6dda53ce0acd9163090b85278213607066
font_01_sfnt_off00010dff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DFF 17380 bytes
SHA-256: 1db62df24ba510db6dd09384f6514641960039b48d9f51ca332f64ba5ed775fa
font_02_sfnt_off00013b36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B36 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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