Malicious PDF — malware analysis report

Static analysis result for SHA-256 c51387ebbe8392cb…

MALICIOUS

PDF

84.6 KB Created: 2021-09-13 09:45:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4e96742d4a1c43d00582ed35435dfb5f SHA-1: f7620bf6a1865406d640fe112647b4aa68667ff2 SHA-256: c51387ebbe8392cba192708bb3e0737d6265f44464df46e5b495548c3dfac74e
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to potentially compromised websites or disposable hosting, indicating a link farm designed to direct users to external content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. The presence of multiple external links and the 'link farm' heuristic point towards an attempt to manipulate search results or trick users into visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://autoscuolemontagna.it/userfiles/files/92575177105.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136f0da40f7f---24527199724.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/fujowokadinizadejuli.pdfIn PDF document text
    • http://ilovehikari.com/uploads/files/ruwugibexoga.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/473fb07977d6060b2bc08b0b0a762511/28269845565.pdfIn PDF document text
    • http://jump360.co/upload/files/20210910191422.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/osahhnld813s2qjhis8anojopa/xokadufaloxegik.pdfIn PDF document text
    • https://eghamatyab.com/basefile/bainbookcom/files/7488632324.pdfIn PDF document text
    • https://mimpiindah2.com/contents/files/vuzopujof.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612efc4b6b51c---88719401957.pdfIn PDF document text
    • https://afmiletisim.com/resimler/files/21993869496.pdfIn PDF document text
    • https://webbsoil.com/home/webb/public_html/ckfinder/userfiles/files/sixinatamamigitabez.pdfIn PDF document text
    • https://vietrocknet.org/app/webroot/img/files/lepuges.pdfIn PDF document text
    • https://jairdefreitas.com/ckfinder/userfiles/files/55133565120.pdfIn PDF document text
    • https://canoe.ro/Extras/ckfinder/userfiles/files/sebinafunumabate.pdfIn PDF document text
    • http://coytex.net/ckfinder/userfiles/files/zisevatemosafadabilulolak.pdfIn PDF document text
    • http://extrastyle.ee/ckfinder/userfiles/files/92591669810.pdfIn PDF document text
    • https://sayurhijau.com/contents/files/sifaguwisotezemawokewojob.pdfIn PDF document text
    • http://superbarter.sk/media/file/19209749721.pdfIn PDF document text
    • http://klick-tipp.info/ckfinder/userfiles/publics/files/vedaxegogebepufuvesa.pdfIn PDF document text
    • https://fuoriscena.eu/file/zetajivotuwawemoxadekuku.pdfIn PDF document text
    • http://hk-keber.de/images/file/liniti.pdfIn PDF document text
    • http://virus-safe-zone.com/ckupload/files/nunidawanuzulatetubakela.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=zombie+catcher+hack+free+downloadPDF 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_off0000e2da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000faec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAEC 18928 bytes
SHA-256: 0eb0d5015358915c026d26366161f5177f1eba3174c561fd914cd9159063eea1
font_02_sfnt_off00012c0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C0E 10852 bytes
SHA-256: 94d2b443d2bef2cd3cd018dc267342ca4e4bcdc15c8734e56f693e3c92848b57

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