Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a65657f604a8413…

MALICIOUS

PDF

103.5 KB Created: 2021-07-07 08:51:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3d9f6a156192d9da64799fc1f048ddca SHA-1: 7b95e4e00dad1072ca53ddd505b96af6eb76d048 SHA-256: 8a65657f604a84136dbd58ca46498c4d54b3a86ae12b66870a7a93d1efd0f789
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing users to multiple URLs, with several hosted on compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL targets suggest a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9910

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 http://a-mega.ua/images/uploads/file/munufojife.pdf
    • https://guijek.com/userfiles/file/fiboxutevifuvowujid.pdf
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6be9d7f744---sutematimewizunimesixato.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c96424b6c4f---72008640135.pdf
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d1b69cb39c---39295649918.pdf
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f020fbc7a0---vesenuzesizegotuvomeb.pdf
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0d2a80787f---92738219755.pdf
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dad898cd5af---88703487602.pdf
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9d06138b67---67455751328.pdf
    • http://agendatourvietnam.com/hinhanh/file/21648963111.pdf
    • https://alshamiltrading.com/alshamilfiles/file/34675440915.pdf
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/vphtpoklb0fe8hkmui41dti56q/50109885112.pdf
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16099babf23a7d---ruvulexavuwoniz.pdf
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/v11lvcasp4rm813p311pqjeg3k/tariveveromifa.pdf
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/qp4ietsgallsdioj3p8j3f4p1b/devetup.pdf
    • https://krono-original.vn/Images_upload/files/kibujegofubakukarenitub.pdf
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4d614592f---54987569356.pdf
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/bd337720b0e7523db82984c98972ce13/40118960176.pdf
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/6ba76448277d2b17c1febec7eaa15925/zemutarifuxafokevuzox.pdf
    • https://havanic.com/cache/fck_files/file/bagenimale.pdf
    • http://itnetworkconsultingsf.com/helpdesk/app/webroot/img/userfiles/files/muragogasezaramuzu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=funniest+racist+jokes+of+all+time
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000127cd.bin
c5ad3f80012a0ad5bb4c1659e9ed7630ee189db2a4d3f23a9566835926d94bf7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x127CD 17708 bytes
font_01_sfnt_off00015623.bin
c469bfeb68c14fa4d2626ccd466cbc061fcdeaddbbb3ec8b4a0994ea78fe020d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15623 10796 bytes
font_02_sfnt_off00016ef6.bin
3c3247882b5181b012272319048767ba8c18ca2405c674584a34d28e45de8df4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16EF6 2028 bytes
font_03_sfnt_off00017832.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17832 16792 bytes

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