Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f3f3a969dda8b10…

MALICIOUS

PDF

84.2 KB Created: 2021-10-08 01:37:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 6ba57574b8a77808b700b5f14982c1ca SHA-1: a338655fa391c841adca8cabc93a1fce5153fbaf SHA-256: 7f3f3a969dda8b10992b20208913dcf3b82cac296ee1c8b6854375c7b9247ad8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains a link farm pointing to numerous compromised WordPress upload directories and disposable hosting sites, suggesting an attempt to distribute malicious content or conduct phishing. The presence of embedded URLs and the nature of the heuristics indicate that the document is designed to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://laborke.ru/uplcv?utm_term=abcd+2013+tamil+movie+download PDF link annotation
    • https://ipkameros.lt/userfiles/file/kakuvafelaxokeganep.pdfIn PDF document text
    • http://gd-weimi.com/upfolder/e/files/20211006024954.pdfIn PDF document text
    • https://jagamimpi.net/contents/files/76721380330.pdfIn PDF document text
    • http://centroolosprato.it/userfiles/files/jikaxejegefetixovexu.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613546ba2034d---2476501327.pdfIn PDF document text
    • http://tentauto23.ru/ckfinder/userfiles/files/bixodanifipezefuleput.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145ab28870dd---zesebotuxe.pdfIn PDF document text
    • http://aliguoriarchitetto.eu/userfiles/files/24693882826.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/e8fdaf637d82f42bec3b6bb6d8fe76da/mikomutaxa.pdfIn PDF document text
    • https://atarentacarburdur.com/userfiles/file/tiwimovubotitagigezusuw.pdfIn PDF document text
    • http://jedwines.com/cmsCart/upload/file/29414010019.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613f85e59b4f0---kemik.pdfIn PDF document text
    • http://www.heatandgas.com/EditorImages/file/6527710624.pdfIn PDF document text
    • http://zzfcw.com/file/fkimg/file/17396403774.pdfIn PDF document text
    • https://xyoaa.org/sites/default/files/files/sigiranejevefadixivom.pdfIn PDF document text
    • https://matricula.hssanesteban.cl/files/99359935810.pdfIn PDF document text
    • https://ww150002.linebot.net/upfile/files/20211007235248.pdfIn PDF document text
    • http://alisawedding.com/upload/users/files/89746819820.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615ef0b8b49e0---labuvenasasefe.pdfIn PDF document text
    • https://peoplesmodelinternational.com/ckfinder/userfiles/files/27077817257.pdfIn PDF document text
    • http://cee1968.com/ckfinder/userfiles/files/47793273827.pdfIn PDF document text
    • http://bloemenwinkelindex.nl/images/uploads/41856785057.pdfIn PDF document text
    • http://cgpreceptor.com/ckfinder/userfiles/files/mopariva.pdfIn PDF document text
    • http://patrickstaxi.fr/userfiles/file/69033057227.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_off0000dbbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBBE 20512 bytes
SHA-256: 0739d7df2c5c4ade70066f3eb38af24b38ea29b2c90591273e70c675856f52ef
font_01_sfnt_off00011107.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11107 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001291e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1291E 11004 bytes
SHA-256: ee0b8ae96d36241d3f3923417dd5968aa9a5ccee67808ac49c627b5c01155ce8

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