Malicious PDF — malware analysis report

Static analysis result for SHA-256 26c60f25cccde919…

MALICIOUS

PDF

75.5 KB Created: 2021-09-06 09:14:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b3c47cc633d2e681d6c89e0bd5f65aa8 SHA-1: fdc118d1849b59d5969644d7e71c7766d892e327 SHA-256: 26c60f25cccde919d0967cde798dede4c668ba770701993d1eea253029e161dc
156 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as a phishing trojan and by an ML classifier. It contains numerous links pointing to compromised websites, many of which are WordPress uploads, suggesting a link farm or redirection mechanism. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a pattern of using disposable hosting for these links, likely to distribute further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609da543acf39---sotepakodoweluz.pdf In PDF document text
    • http://neenah1976.com/clients/17995/File/53124053757.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/lubovixarigujeposidij.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160943c9524301---pudafedufexan.pdfIn PDF document text
    • http://abwingsmd.com/uploads/files/nanoseriloxonitav.pdfIn PDF document text
    • http://girc.ncue.edu.tw/ckfinder/ckfiles/files/famuvedomudil.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/vmpp7ejtdsms8g8p0pgg79hdh7/46201095333.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/nupekagorutepedotodiwuf.pdfIn PDF document text
    • http://veiligheidssloten.nl/ckfinder/userfiles/files/4183252426.pdfIn PDF document text
    • http://cascinamana.it/userfiles/file/tudanupovorogug.pdfIn PDF document text
    • https://irisapp.cn/uploadfiles/fckeditor/20210703/file/16252991193342.pdfIn PDF document text
    • https://hgindustrial.eu/userfiles/files/91926597715.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3b6196bfd---zodobiletororurodokijosu.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607752be51051---59044495026.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/ed673d851e374988afcefc2a5928c325/29525132504.pdfIn PDF document text
    • http://nguyenquangcomputer.com/upload/ck/files/72636807947.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/vesotidosodofowakifotijo.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/62559e9c44965aea95b453798b06f38d/vizevi.pdfIn PDF document text
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/refalifo.pdfIn PDF document text
    • https://hijaulumut.com/contents//files/somogodutavavakanomita.pdfIn PDF document text
    • http://sriagasthiyarastro.com/FCKeditor/userfiles/file/sebofutujupum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=wake+hillsong+young+and+free+chords+pdfPDF 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_off0000c2b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2B4 11100 bytes
SHA-256: 5063c800affbdba08b9fe0f10ad1604187391cf412cdb3438f4beb5bfa1bb3af
font_01_sfnt_off0000dc57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC57 16948 bytes
SHA-256: cf24619356751efb9e0b490453589166c48236e1b0405e8bb7acedb68deef10b
font_02_sfnt_off000107f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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