Malicious PDF — malware analysis report

Static analysis result for SHA-256 389c074fef17dcd1…

MALICIOUS

PDF

92.9 KB Created: 2021-06-30 09:56:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 607412b0c731c5f1981d3120f5c80b11 SHA-1: e0ba1bfda51112f9a6af2076bc0cf6d7754a8bb5 SHA-256: 389c074fef17dcd101b754f5182218ec0875fdf2f49350e5b93342700bc893b4
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document's structure suggests it's designed to lure users into clicking these links, potentially leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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://oniceh.ru/uplcv?utm_term=the+complete+reloading+manual PDF link annotation
    • https://autotrans911.com/thread/admin/uploads/file/tenumere.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16091edf2c39c7---pipubigomifakesiduvufoj.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/4b8ca6ef604c1bb1a4bf578a2a217272/65298906210.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/32bjmurfdf9fg732j6l5lsqr91/digarejevenikokinanejeteb.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a07c748f76e---16305301819.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/tb870p4i26fisli3bj5dssi42i/kopimorezowolafas.pdfIn PDF document text
    • http://www.rify.us/cms-uploads/files/15398294322.pdfIn PDF document text
    • http://slhs1958.com/clients/18590/File/83142882566.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d5df9462643---xufabusageda.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a6182feddbb---bitaluviwuned.pdfIn PDF document text
    • https://dijitalsanat.link/upload/files/71109961833.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/bk3mgk4kpfnmoo97nm9dmivlvf/wagiwan.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3462a39704---befivorapuxumazoruzok.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0cdc2a9e7---42915740013.pdfIn PDF document text
    • http://giaoducvietnamtv.com/images/ckeditor/files/xixila.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160887a814f5a5---rilagoxemipitem.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/af83838bec93268fabc485fc5992a60f/votogudakabuwan.pdfIn PDF document text
    • https://ebooksweb.net/files/file/13562295957.pdfIn PDF document text
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/8a135fee69ed5dda7826f95445bcbb71/logudu.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/16099b5d36082b---sojezesigikoki.pdfIn PDF document text
    • http://remproekt-m.ru/admin/ckfinder/userfiles/files/11448354331.pdfIn PDF document text
    • https://optimustelecoms.com/ckfinder/userfiles/files/jedifolaru.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fcb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB1 10856 bytes
SHA-256: f5e8ebfdc7180b78a4fbdb6e70290749a3e8a60ff4e390a4e94774b7bae08233
font_01_sfnt_off00011555.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11555 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D67 18060 bytes
SHA-256: 344b5a7e86970f9bd924ea3a8480ad0dd68b7e66942bd2864173d9c8c6d23eb0
font_03_sfnt_off00015c7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C7B 1728 bytes
SHA-256: 164b17f13be751c428b8a7847bfef4401e4c17c2bf41cfc2fceec83f5d69c6ba

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