Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c954423be1dd3d4…

MALICIOUS

PDF

80.8 KB Created: 2021-09-19 01:15:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: fcfa8870cf0ddd31bd6abbb958aac7a3 SHA-1: 3877069e62409ee82010390ed7bddf5582de4dd2 SHA-256: 0c954423be1dd3d471d254419c28302bcb7ba346e76d084922a3242fd4b2443f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs pointing to various domains, many of which are hosted on compromised CMS upload storage or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially malicious content, likely as part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://careersourcechipola.com/files/public/nefonusutilokovexogovanum.pdf In PDF document text
    • http://plise.org/userfiles/file/dugegegetudazi.pdfIn PDF document text
    • http://nattukoottam.com/userfiles/file/44571412221.pdfIn PDF document text
    • https://miet.hu/kepek/rolunujilewotedukimo.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/161465ed81e762---ravukefu.pdfIn PDF document text
    • http://dalnoboy.org/data/filestorage/upload/files/mikefopod.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210903180346570197038.pdfIn PDF document text
    • http://yangs-ns.com/ckfinder/userfiles/files/20210908012024.pdfIn PDF document text
    • http://monthclean.com/uploads/files/202108311720143935.pdfIn PDF document text
    • http://www.smwiarus.pl/ckfinder/userfiles/files/19240659733.pdfIn PDF document text
    • http://karate-talence.com/newsite/userfiles/files/16873942872.pdfIn PDF document text
    • http://1yunnan.com/ckfinder/userfiles/files/39590660561.pdfIn PDF document text
    • http://sun-tes.ru/files/file/nilakixogo.pdfIn PDF document text
    • http://855solution.com/htdocs/cljr/data/files/77262029848.pdfIn PDF document text
    • http://sportingfoundation.com/uploads/file/90728027152.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aab534c9cb---rexeguzesedegixovitun.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137ab692df4c---57656412269.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140936d10977---52427893915.pdfIn PDF document text
    • http://vekosgroup.ru/userfiles/file/biriluman.pdfIn PDF document text
    • http://abwingsbuffalo.com/uploads/files/lojupox.pdfIn PDF document text
    • http://www.dr.schure.net/ckfinder/userfiles/files/58188786388.pdfIn PDF document text
    • http://kondicionery-pushkino.ru/upload_picture/file/97227199586.pdfIn PDF document text
    • http://shardamedicalstore.com/singhania/downloads/file/molafamejosatoxidanegu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=ros+free+diamonds+pcPDF 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_off0000d761.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD761 18020 bytes
SHA-256: 21c884a743552e7e54c704fbc708d699d0049bb1d7b09a39e708a0d275fbae6b
font_01_sfnt_off000105a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105A8 10680 bytes
SHA-256: 9c50b405956579e90c44c0721780d5931cd7a6c226153bc1bd71877ead3c8df1
font_02_sfnt_off00011e1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E1E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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