Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2f1527882c08818…

MALICIOUS

PDF

87.3 KB Created: 2021-07-02 10:16:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: ad80e174bb73496961594b33f039c415 SHA-1: bbd07a4ad4cf6c5e88f8235e16237b843f79a6e3 SHA-256: d2f1527882c0881830b4896ff2104d33488b1cb6f3a581738816d3968a6817c2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or trojan delivery mechanism. The document functions as a link farm, with numerous URLs pointing to compromised CMS upload directories, suggesting an attempt to lure users to malicious sites. No scripts were extracted, and the document body was unreadable, limiting further analysis of specific payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/rumb1pbre2i9tesn9vjn6mnrv3/zufawesowabojerunamu.pdf In PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/5j4buc327m01bpeiue7ch5fg3i/noriwozidesusivepajo.pdfIn PDF document text
    • http://www.makattakasinti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd7b324e2a---visufafetebovaruwusimo.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16078351b50766---11076425095.pdfIn PDF document text
    • http://pogservice.ru/userfiles/file/78338836661.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bda7226fde7---91943698820.pdfIn PDF document text
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/8b72dc4b9af103d2806610e28e303447/41387707596.pdfIn PDF document text
    • http://www.pics4us.de/userfiles/file/40145810420.pdfIn PDF document text
    • http://kimbuunguyen.com/uploads/userfiles/file/dujas.pdfIn PDF document text
    • http://cpbnatation.fr/fckeditor/userfiles/file/detosijanolevimex.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160c0ee3f18e5e---tologotikonobagewiloraga.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/fpqbnicl58mqej9urlcujag7c8/6388007158.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072aa1832d5d---38285904872.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606fcc47e9014---tuwolefimebu.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160bb40fae6009---23340455010.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d30e3a3ee82---tajitasarotoruzudin.pdfIn PDF document text
    • http://autavrabek.cz/obrazky/file/nudofojomegodokeweto.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/20612196856.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aec4302bfb8---20989394598.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/9433946921.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/wakisipumuvujobanuwa.pdfIn PDF document text
    • https://ceccarbotosani.ro/userfiles/file/95798049098.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/sjpkmf1936f635k019fao8j0cr/pijopalomo.pdfIn PDF document text
    • http://hy-concrete.ru/d/files/50434612546.pdfIn PDF document text
    • https://ppuhperspektywa.pl/files/edytor/file/79236776555.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=benzene+with+alcoholPDF 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_off0000f5b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B3 10260 bytes
SHA-256: 0527868e6c969c09acacd886c7182c369117d9c1d18b9d8386de8576d2a06fdd
font_01_sfnt_off00010ccf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CCF 16672 bytes
SHA-256: eddbb9cbef684a099a57b0f374cc5c5e4e0f3d61a7eae1c4d81b1a64546da199
font_02_sfnt_off00013842.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13842 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1