Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4124f956fa22e49…

MALICIOUS

PDF

71.5 KB Created: 2021-09-08 20:16:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5087894b308341f3fdd95423ec0fe6a6 SHA-1: abd87b046334504cbf5efb7601dda25f63fd9ad5 SHA-256: b4124f956fa22e49bec27f68113483e8b3281413f667eef86abd6ead1e23c80c
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's likely a phishing or trojan delivery mechanism. The heuristics reveal it functions as a link farm, with many embedded URLs pointing to compromised CMS uploads and disposable hosting. These links are likely intended to redirect users to malicious content or further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://inter-travel.hu/_user/file/sifilusoxosati.pdf In PDF document text
    • https://olterus.info/contents/files/8633034917.pdfIn PDF document text
    • http://wtmongolia.com/materials/file/gedorirafugiwivefef.pdfIn PDF document text
    • http://iraneto.com/basefile/iranetocom/files/4681023767.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613299d1eec8b---16519767288.pdfIn PDF document text
    • http://bacsiha.com/public/ckfinder/userfiles/files/47638461361.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161361e0d767d3---mepuvakejovawozura.pdfIn PDF document text
    • http://wuxihemei.com/ckfinder/userfiles/files/20210902_094540.pdfIn PDF document text
    • http://goodfortune.hk/UpLoadFile/file///fobinozuvazaboz.pdfIn PDF document text
    • http://bbpcosmetics.com/admin/upFiles/2021-9/file/wofevitupopikagokobavoda.pdfIn PDF document text
    • http://mousike.it/img_ins/files/81740980439.pdfIn PDF document text
    • http://tatvideo.ru/ckfinder/userfiles/files/lujuvirufologaxamerofuma.pdfIn PDF document text
    • http://masan315.net/board/imagefile/file/91011546634.pdfIn PDF document text
    • http://ohdiabo.net/images/ckeditor/files/43094755996.pdfIn PDF document text
    • http://lnv-cnc.com/userfiles/file/nivelejok.pdfIn PDF document text
    • http://agriturismoilnoceto.com/userfiles/files/42546823281.pdfIn PDF document text
    • http://olgapolyakova.com/files/files/42809884943.pdfIn PDF document text
    • http://jmlukanich.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/76618078765.pdfIn PDF document text
    • http://laibros.com/ckeditor/userfiles/files/fenipixawaxugakekixasad.pdfIn PDF document text
    • http://massimomoroni.it/userfiles/files/72437973610.pdfIn PDF document text
    • https://gretajensen.com/ckfinder/userfiles/files/feroxamivopapejufepe.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/161300afcb9f4b---nanufibiwi.pdfIn PDF document text
    • http://dsraxys.com/uploads/zasimiredarutafo.pdfIn PDF document text
    • http://czernavendeghaz.hu/admin1/file/63891867387.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=gurucharitra+14+adhyay+in+english+pdfPDF 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_off0000b3c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3C1 11160 bytes
SHA-256: 0e42835c2a1e05a2a1faadeb687538f525bb5593804accd0aa3c48e75466d4c8
font_01_sfnt_off0000cdae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDAE 16852 bytes
SHA-256: 57ea2a14fc8633ea1a48d35184e35d4e092926b730aaa21d292edb2316f48ef9
font_02_sfnt_off0000f807.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF807 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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