Malicious PDF — malware analysis report

Static analysis result for SHA-256 4895c514aa0d894f…

MALICIOUS

PDF

77.1 KB Created: 2021-08-19 05:47:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 7b342f4b8c912e283804d8c9a474ea4f SHA-1: 66963c90cb5662e83b8c22fcd609d5d0310d8237 SHA-256: 4895c514aa0d894fc1a8c591e4644f1dbc2bd58f37f8a462010a4b0636029c7e
156 Risk Score

Malware Insights

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

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites and disposable domains, likely to lure users into phishing scams or download further malware. No scripts were extracted, and the document body was unreadable, but the heuristic findings strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160b8e291319f1---biredajozanasimuk.pdf In PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094aa8dc7a43---vuzidosufibowobarunevu.pdfIn PDF document text
    • https://limblength-sldf.com/userfiles/file/kupidanuxemufisomug.pdfIn PDF document text
    • http://boschvietnam.vn/files/usersfiles/files/72145593069.pdfIn PDF document text
    • https://bititechnika.com/uploads/file/bugodosewujoju.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a73b3e9ff24---71726499987.pdfIn PDF document text
    • http://clair-environnement.eu/catalogue_dynamique/file/tiporudodosivegal.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/vkefsmrj83cibum6io521e2mkg/xezurekoxi.pdfIn PDF document text
    • http://nextgt.eu/uploads/file/7490045251.pdfIn PDF document text
    • http://evaemlak.com/userfiles/file///setowogafes.pdfIn PDF document text
    • https://hosvagyok.hu/userfiles/file/xudemuminokugikexogofar.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/1lbmevt1lllmlsp4pbu7tuleq7/kokugazefexuvewuma.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/9p55k77jsmg60j29srsbeu43e7/98102838018.pdfIn PDF document text
    • http://birizgardenhotel.com/userfiles/file/gojazisoditus.pdfIn PDF document text
    • http://yourhealthyanswer.com/ckfinder/userfiles/files/44930216823.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/16077f60aafac3---1862897927.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160eca19d180b6---xibuni.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/5db95h3fnourpuhpjm5h6lndh1/dapozugo.pdfIn PDF document text
    • https://atlanticcompact.org/userfiles/files/wakovagiruzujiwuluxejude.pdfIn PDF document text
    • http://showpalmedical.com/userfiles/75835157876.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083d401b485d---73126706496.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be41449095b---61986774711.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c57b19347f8---57007901102.pdfIn PDF document text
    • https://contact-house.com/fckeditor/upload/file/rudakafas.pdfIn PDF document text
    • http://kochamsushi.pl/UserFiles/file/37213136256.pdfIn PDF document text
    • http://easyliveconstruction.com/ci/userfiles/files/fejajevep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=braun+silk+epil+7+user+guidePDF 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_off0000c627.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC627 10644 bytes
SHA-256: 15aa0953261b18a21d8f6762c0be5cae899e5daa77b97ede38ccba074cfb1209
font_01_sfnt_off0000de6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE6D 18432 bytes
SHA-256: 99f9ca9280a3b8f50e9a80b3450e2c89218e00151c824912ab664f38f2c43adf
font_02_sfnt_off00010dac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DAC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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