Malicious PDF — malware analysis report

Static analysis result for SHA-256 467b8c5bc03840e8…

MALICIOUS

PDF

130.9 KB Created: 2021-07-13 17:15:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 21ef07ddcf90a5faa865b6d6f52e4f53 SHA-1: f85d281afbff61697a1572743ccca4e69d266663 SHA-256: 467b8c5bc03840e8252bb48c0933eb2d36e1ea4876763039c769fffa961badf5
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 pointing to compromised WordPress upload directories and other potentially disposable hosting, suggesting a link farm designed to redirect users. The PDF structure and embedded URLs are indicative of a phishing or malware distribution campaign, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://wastran.ru/uplcv?utm_term=taurine+in+cosmetics PDF link annotation
    • https://pubs-icfas.org/icfas_new/dev/ckfinder/userfiles/files/58824079090.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/2ecd7480799d0bdbc751d47d54796445/30812843520.pdfIn PDF document text
    • https://btsmstlucia.com/atomicsteps/upload/userfiles/file/56004130459.pdfIn PDF document text
    • http://beautybybelief.com/admin/images/file/47434144238.pdfIn PDF document text
    • http://myxroad.com/upload/userfiles/file///vipelibetetazusafaf.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/47a9c0ba8dce2de6bbd72b46a1a971a6/2165612815.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160708ef153b8a---52779361090.pdfIn PDF document text
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/50757be8446d09163f9619c9586c54d2/80084197136.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/d8632bb479f5c4e6f1c3a16ca89367ed/dasumakalimajavarerexej.pdfIn PDF document text
    • https://www.autodepotperformancegroup.ca/wp-content/plugins/super-forms/uploads/php/files/t9cbphvn3563pij1a4lnkgpccq/rapidijarotaxokuv.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/59062235ff106ea475182bc2b06e0558/38383831041.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/16094676e09c2b---gozuleramagasexij.pdfIn PDF document text
    • http://donateagift.eu/userfiles/file/rutoti.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/da6mluc3g5b93rcm5f3lnn2mm2/begoridufeni.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1608f07d1a8796---pulumob.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160876d8544997---pobuzonitubadaw.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/9a4406ed5cf71009d6df3344a4dc1a7d/10042000599.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/37705538733.pdfIn PDF document text
    • http://dominoliberec.eu/images/file/files/dugatavokidi.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160b320cf570e1---52833093326.pdfIn PDF document text
    • http://cabini.it/userfiles/files/83326969111.pdfIn PDF document text
    • http://bangtaisay.com/uploads/userfiles/file/78042790595.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609735036ef53---pafukob.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_off00019fa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19FA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001b7b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B7B7 17320 bytes
SHA-256: 13a848471d9dc321fb0fb797151a6fe57803fbfb2b766b235c3c8e71abb06c34
font_02_sfnt_off0001e51e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E51E 10408 bytes
SHA-256: edd2d20fb0ea6cd04c0b686ca6516e9af567cde342755ae627471fdb7f49d970

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