Malicious PDF — malware analysis report

Static analysis result for SHA-256 85da435d05cbaa21…

MALICIOUS

PDF

76.4 KB Created: 2021-10-06 20:27:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 7e9de7da293e0eda0e4d0c3f4ebaf6c1 SHA-1: f1aef25e2efdf7fa1dc184bc8099f063415092a6 SHA-256: 85da435d05cbaa218f5272b8e8546420a5732782e1340ebd4ab237fb3dee0cb4
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to various domains, many of which appear to be part of a link farm designed to redirect users to potentially malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for these links, further suggesting a malicious intent to obscure the ultimate destination.

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://wastran.ru/uplcv?utm_term=game+of+life+c+code PDF link annotation
    • http://kondicionery-domodedovo.ru/upload_picture/file/niwojegazigib.pdfIn PDF document text
    • http://businesslegalgroup.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/serojuvibedusapasebiw.pdfIn PDF document text
    • http://electriccityusa.com/images/fck_uploads/file/15619876453.pdfIn PDF document text
    • http://www.eau-msu.ru/ckfinder/userfiles/files/jadipiwesekopawalibele.pdfIn PDF document text
    • http://piqiso.ru/userfiles/file/77989299265.pdfIn PDF document text
    • http://clarksville.net/wysiwygfiles/file/mivelomepifelozirax.pdfIn PDF document text
    • http://charivne.info/images/file/75777681133.pdfIn PDF document text
    • https://jackinthegym.com/uploads/files/202109131335338558.pdfIn PDF document text
    • http://salondebellezaanamariaromero.es/ckfinder/userfiles/files/69782090703.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16139703478c01---naguboto.pdfIn PDF document text
    • https://nnt52.ru/userfiles/file/62378672443.pdfIn PDF document text
    • http://arqing.es/ckfinder/userfiles/files/19003271407.pdfIn PDF document text
    • http://kalmi.ru/upfiles/files/2202202063.pdfIn PDF document text
    • https://purevdavaa.mn/uploads/ckfinder/files/kukikilavoxugoxusatixodo.pdfIn PDF document text
    • https://dhrc.in/userfiles/file/36032843929.pdfIn PDF document text
    • http://kedehg.com/ckfinder/userfiles/files/69985638459.pdfIn PDF document text
    • https://namratalakhotia.com/userfiles/files/rajisupu.pdfIn PDF document text
    • http://kiko168.com/UploadFile/file/20210925214251707.pdfIn PDF document text
    • http://bennett-legal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/22466909017.pdfIn PDF document text
    • https://lederstuhl-shop.de/ckfinder/userfiles/files/fusaz.pdfIn PDF document text
    • http://assotechne.eu/userfiles/files/1383384067.pdfIn PDF document text
    • http://dexgerm.com/data/file/userfiles/files/razubaxojanutilipo.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615dd562d099c---xawob.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/16134096cb16da---77340763488.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_off0000c456.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC456 10208 bytes
SHA-256: 1e9b4497cce75f3720a8c8d0ed20d3aa17f5346b60d40743e6af7a7aaad8d117
font_01_sfnt_off0000db31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB31 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f343.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF343 18436 bytes
SHA-256: e15817e82b2091617850c2ede5e1b68c9bfcbdfb22874bdf8a733c039d052f07

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