Malicious PDF — malware analysis report

Static analysis result for SHA-256 925d53c5f4c42f25…

MALICIOUS

PDF

69.9 KB Created: 2021-10-02 17:25:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c47c60305f1a7d3c4864d85eba9b91b2 SHA-1: adeb0502cfc54a05619305e166c75984d9cbaf86 SHA-256: 925d53c5f4c42f25ad403becf047191771d2a6764360ee2e425ddba83050448c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous URLs that point to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and the nature of the URLs indicate an attempt to exploit users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://archism.ru/uplcv?utm_term=charlotte%27s+web+chapter+19+questions+and+answers
    • https://mannoorpally.com/uploads/file/62885683801.pdf
    • https://tigapilar.com/upload/files/78723008916.pdf
    • https://0a3exp.com/upfiles/editor/files/69995582909.pdf
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/16151b355151bd---wemuzezunolifet.pdf
    • https://mancomunidadvaldizarbe.com/userfiles/files/golob.pdf
    • http://sangjeom.com/userfiles/file///posufasubovun.pdf
    • https://gozdekadife.com/resimler/files/36289937670.pdf
    • http://gurmanosypsnys.lt/userfiles/file/muwiza.pdf
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141b543028cd---27833193287.pdf
    • https://chasehr.in/userfiles/file/82929673083.pdf
    • http://licausi.it/userfiles/files/41844186093.pdf
    • http://aquatherm-graz.at/files/kepevovaxupifutem.pdf
    • https://umiyawoodworks.com/fckdb/userfiles/file/43012011426.pdf
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/c72c1fcd007d3be5896c6e7aa13f0bbe/xodujujuwenute.pdf
    • http://terredellamagnagrecia.com/userfiles/files/bewuselumujugako.pdf
    • http://pho32shabu.com/uploads/files/doxoxalofupatujunawozif.pdf
    • http://receptlap.hu/files/naporebopovipo.pdf
    • http://geosond.pl/userfiles/file/pujumebukorexeme.pdf
    • https://flims.atelierleuthold.ch/userfiles/files/butiwupasigegadu.pdf
    • http://cx-gl.hu/images/files/vejomesojalubumi.pdf
    • http://crystaltrade.hu/data/file/609440053.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ac83.bin
c4d2b57b3407b418de70b62c183b2a79d0c2858ac84509ad3ec274af9a36e1e7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAC83 15960 bytes
font_01_sfnt_off0000d55c.bin
0fee24478b2c8a9b2b19d8a09a845c2b73d7375ce468814f26dcbd0521c1bcd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD55C 11368 bytes
font_02_sfnt_off0000efda.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFDA 16792 bytes

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