Malicious PDF — malware analysis report

Static analysis result for SHA-256 2867bd91a9019fe4…

MALICIOUS

PDF

88.4 KB Created: 2021-07-04 01:00:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 34aa36ec7413af41789c7390601acae4 SHA-1: 501e0300fc5d0b9a795d4160574df4e0662a0c54 SHA-256: 2867bd91a9019fe4da3a742015974d7a480da877de3c7d901cae3a7d4f05b5ce
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://synerhu.ru/uplcv?utm_term=final+reflection+essay PDF link annotation
    • https://fallsplat.se/file/64823307983.pdfIn PDF document text
    • https://eobliecky.sk/userfiles/file/ropufubivoxabegeme.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/23863701262.pdfIn PDF document text
    • http://taeguektour.com/FileData/ckfinder/files/20210601_24664E6FB79B9B43.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/79854957077.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083c68ccb86e---judakiriwofisedul.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/108bf72dc526ad187b452bf3b41a1b2c/73734468394.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160929cdae1a5b---gilutobitetefiwin.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/th8lv5rvhduphigolareh89sq6/zepukepiduguvek.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/3cbk4v8o0ffeml8dq47ctf3iof/jabemesudopanirosuluf.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b7ddb4a3dc9---tazesevagerow.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a4584394f39---29395968179.pdfIn PDF document text
    • https://iringmalaysia.com/ckfinder/userfiles/files/foliropavaposojurasofoj.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3736a50009---99747317522.pdfIn PDF document text
    • http://k1a.ru/images/files/file/gujizazorife.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/valosamatafunagedajakor.pdfIn PDF document text
    • https://proektasis.gr/admin/spaw2/uploads/files/giluwuta.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160745736ed5dd---zoluwim.pdfIn PDF document text
    • https://misionesmedellin2030.com/wp-content/plugins/super-forms/uploads/php/files/f5opr086hd60ouhgf0670rjsn2/5001993874.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/9c5a5692ed333efde5c345be42b9baef/lemimure.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160822343ed82e---lepezozenepegamid.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16099c3c7553d9---kowilurulizu.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/ed4c556ebaab2918395295a6b28c9bc9/282720614.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_off0000f936.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF936 16840 bytes
SHA-256: 66d2e1f34e7c0afa182f2782f579d1a15841b2d3bd05dc82f4f2b29cbd4e8c11
font_01_sfnt_off000124d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124D5 10420 bytes
SHA-256: 70741a0b1a6c19cce2dc29ae38b94fec07bdba12d597f43f894a63ffc88a713a
font_02_sfnt_off00013c96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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