Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d2ff87b0a41732b…

MALICIOUS

PDF

78.4 KB Created: 2021-09-18 04:37:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b4b33e75293dd456476a0706ade08678 SHA-1: 76a1df579d10fe41deac945e7e5038a4f050ccfe SHA-256: 5d2ff87b0a41732bfcb08c07cac67ed01342269a569d9d6159aac55e0d4df537
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting it's designed to redirect users to potentially harmful sites. The embedded URLs and the nature of the link farm heuristics strongly suggest a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://www.findvoters.com/userfiles/file/sefamosanajejej.pdf In PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/4bb6b176698a6c0405140d65fed7fe9c/bovinokugozupiwinizu.pdfIn PDF document text
    • http://rudolphalexander.com/uploads/files/7137658877.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/16136db0a865ea---rarezomo.pdfIn PDF document text
    • https://profm.hu/files/file/begejefasomifirawobemi.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/e1702f277b5da2b530c336d80bbc64ad/wenimogiva.pdfIn PDF document text
    • http://polipadel.com/userfiles/file/nabikesobebezer.pdfIn PDF document text
    • https://regiefranchet.fr/userfiles/files/gonuziwazumoxijamim.pdfIn PDF document text
    • http://reflita.lt/uploads/files/jamuvidalibosirusiwev.pdfIn PDF document text
    • http://ipsaix.com/ckeditor/ckfinder/userfiles/files/sudita.pdfIn PDF document text
    • https://organicfertilizerproduction.com/d/files/32508163802.pdfIn PDF document text
    • https://cardion.dk/gfx/fckimages/file/98994406631.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/wojule.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/ou452ijj55m9eddkcv4enrqkc9/40817958383.pdfIn PDF document text
    • https://dialogueinpraxis.net/files/docs/95643410403.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/nelatanotupurasupetenaza.pdfIn PDF document text
    • https://shiprapublication.com/uniformkontakt/userfiles/image/files/fixewikodireda.pdfIn PDF document text
    • https://ms01bet.net/contents/files/85326497373.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/files/vonogapev.pdfIn PDF document text
    • http://chiari-web.com/ckfinder/optimist/files/44159316433.pdfIn PDF document text
    • https://hoatuoi360.vn/uploads/files/56734894455.pdfIn PDF document text
    • https://ikorti-iao.com/userfiles/files/buraruxidixuf.pdfIn PDF document text
    • http://avvocato-callegaro.it/public/file/41015440989.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=unix+terminal+for+androidPDF 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_off0000cdfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDFD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e614.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE614 10456 bytes
SHA-256: 36d40430813457c039ace78274514da8d606b264ff74632ddbc23995f3a11219
font_02_sfnt_off0000fdc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC3 18048 bytes
SHA-256: 2b6cfe90fb1b3be1bf98c528e00f44e3067ce282b41b6691c7ad11685f76b396