Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4a854baab8a271b…

MALICIOUS

PDF

76.2 KB Created: 2021-09-03 05:20:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 75c4676c770b648fd8a33079b67f64f1 SHA-1: 36ed6a5616943c61cc9ded4496abbbb862e83ab3 SHA-256: d4a854baab8a271bc68873879c09706e57fa0ce13ab29056a65dc3a48d3ae3c5
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed for malicious redirection. The ClamAV detection and ML classifier strongly suggest this PDF is a phishing or malware delivery vehicle. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://synerhu.ru/uplcv?utm_term=anemia+y+tipos+de+anemia+pdf PDF link annotation
    • https://sjamsul-hidajat.id/ck_uploads/uploads/files/46440539080.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec2fbd73b9---76794623516.pdfIn PDF document text
    • http://brixtontaxi.com/survey/userfiles/files/35289257324.pdfIn PDF document text
    • https://tepihtrava.rs/files/fezekoja.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/7bb42ce33017cc798dc0a5b442301352/tujikukope.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/5bo5gt8geot309l6f1gq2ke4ug/80609782984.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/142113016827.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/si5smahg0kle4jj36d7a1mfgj6/63555656521.pdfIn PDF document text
    • https://kuzeyilac.com/resimler/files/rirumanizapizofov.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/pt3q5i442v85pq3kb5c1b6cas2/wexifakosopekipodap.pdfIn PDF document text
    • http://bugaboo-buffalo.eu/UserFiles/File/71152444346.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/oric3p3s4bjcuaa0bb3mhivdud/38690589043.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16090796c1f544---87505325663.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607cca7802096---29965448320.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/98cfbd41938e771020394de9709dbf76/16787941583.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4f088f076---lazekufuna.pdfIn PDF document text
    • http://gazosilikatnn.ru/uploads/files/45031819327.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c901429447---89216218769.pdfIn PDF document text
    • https://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/ed87e25500c9e0fff87c0ec7fa52a968/81740613355.pdfIn PDF document text
    • http://psychanalyste-gard.fr/ckfinder/userfiles/files/wawetek.pdfIn PDF document text
    • https://astefin.ro/ckfinder/userfiles/files/tunikatuzakoni.pdfIn PDF document text
    • https://stotex.rs/files/80205774407.pdfIn PDF document text
    • https://kozhikodedeaf.org/admin/my_files/file/xejoxidelupipifeneduji.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/853ed09a1db84f2309d67634f9094e7c/jixedagazajedusokami.pdfIn PDF document text
    • http://wilkinsconnection.com/clients/9/94/94ba1e7d864c5c8af3bb481f5f9f31de/File/18085362407.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_off0000c78f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC78F 10608 bytes
SHA-256: 7b30df076a89724f9b432393e4a9723e01ce4f6a77bcb991d0678b47001b856f
font_01_sfnt_off0000dfd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD8 17032 bytes
SHA-256: cbf2d079ad3241564a9ae1a0a4ac7cb0ead057f78fd2a34413cfb4910659d4fb
font_02_sfnt_off00010b80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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