Malicious PDF — malware analysis report

Static analysis result for SHA-256 712df5244bf4d60f…

MALICIOUS

PDF

72.9 KB Created: 2021-09-15 12:53:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c6c57d0f1a2d7a554d87cf528a9e28b2 SHA-1: 62b0f726f340e2652d6cae4d0324b7917994c4e6 SHA-256: 712df5244bf4d60f5bad67f1ef62ef5b2e7705f99202047abc3351f7b246140d
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with numerous external URIs pointing to various domains, some of which appear to be compromised CMS uploads or hosted on disposable infrastructure. The presence of a 'utm_term' parameter suggests a phishing or tracking attempt. No scripts were extracted, but the overall structure and URL distribution strongly suggest a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://pixomot.ru/uplcv?utm_term=danganronpa+download+ppsspp PDF link annotation
    • http://fitsiluet.cz/data/file/6184794536.pdfIn PDF document text
    • http://rsti.biz/files/fck/file/punavuxofeburukuwonemo.pdfIn PDF document text
    • http://fantasymusic.it/userfiles/files/84034582714.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16134ff2f3110a---xudamuw.pdfIn PDF document text
    • https://optimumquestsolutions.com/ckfinder/userfiles/files/panewilalawaxowesakum.pdfIn PDF document text
    • https://iphone-odklep.si/vsebina/40386881079.pdfIn PDF document text
    • http://citygclub.com/ckupload/files/wozazere.pdfIn PDF document text
    • http://hoclaixebinhthuan.com/upload/contentFile/file/viraxodapiw.pdfIn PDF document text
    • http://jr.ac.th/ckfinder/userfiles/files/97149699039.pdfIn PDF document text
    • http://helder-effect.nl/userfiles/file/nemabubaguziza.pdfIn PDF document text
    • https://kiptep.ru/file/88249653453.pdfIn PDF document text
    • http://freeorden.com/media/file/xaxuwiwogotaxiroxobadi.pdfIn PDF document text
    • http://yanartekstil.com/firma/files/fewedu.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/6c4c1aba24dd3443d1b66c47bfc6c324/44888193585.pdfIn PDF document text
    • https://alsultantrading.ae/userfiles/files/63347870608.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139e3144b8d4---46522667732.pdfIn PDF document text
    • https://quatcongnghieput.com/uploads/files/2173437969.pdfIn PDF document text
    • http://bosch-elektronarzedzia.pl/catalog/file/ziziraz.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613a21949fe30---60651414295.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/70771589719.pdfIn PDF document text
    • http://www.prunay-en-yvelines.fr/ckfinder/userfiles/files/warudefopijagonano.pdfIn PDF document text
    • http://visit-pune.com/userfiles/file/fimugozawivabivagadosa.pdfIn PDF document text
    • https://colegiumaniucarei.ro/ckfinder/userfiles/files/16948069301.pdfIn PDF document text
    • http://togul.org/sites/default/files/file/ximadudopokupapofoder.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_off0000b703.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB703 10332 bytes
SHA-256: 43813429eb2441607deeb0694d1878d11dbc6e1cabe022d12647040a34df71e8
font_01_sfnt_off0000ce3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE3D 18236 bytes
SHA-256: 770676ca19474e5ad0854cc324531e2d1cdae25dff0c84b7d99620fc59516ec8
font_02_sfnt_off0000fdcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDCD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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