Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b6d6189f38c37b8…

MALICIOUS

PDF

87.9 KB Created: 2021-09-05 10:53:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 9e133751b11d730cf2e05d148f423fb9 SHA-1: 61aa92ae2a8e7e9879c99da9468871f7c4e8ce94 SHA-256: 8b6d6189f38c37b8ecf4f00268093ca68e6f5565898b9d20f6f3fbbea9520de6
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised CMS upload directories, indicating a link farm designed to manipulate search engine results or lead users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/8df27a497cb782edb18cb3c8bec439c0/56799904918.pdf In PDF document text
    • https://boumqueur-edition.com/upload/fckeditor/file/79340675330.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1609420c2313cc---rakegazakuzigavuguxuxi.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/3b4d2c656059a0c1309393645e04c2f8/vowazi.pdfIn PDF document text
    • https://kingdomofgodmn.org/userfiles/files/negawizazalepubedodibidi.pdfIn PDF document text
    • http://meteosputnik.ru/userfiles/file/punaxewuw.pdfIn PDF document text
    • http://helder-effect.nl/userfiles/file/34034998939.pdfIn PDF document text
    • http://testplanet.nl/uploads/files/lurivufewobiduxujifuj.pdfIn PDF document text
    • https://marljivo.hr/UserFiles/files/32563412392.pdfIn PDF document text
    • http://biurod9.pl/public/userfiles/file/35532495959.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/72e2d8e193ec2352548a8fff5c6a887c/55803676966.pdfIn PDF document text
    • https://cremyco.com/app/webroot/docs/file/43756152969.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/c0939dd76db93ff100969d4daaa51eae/12261047635.pdfIn PDF document text
    • http://frickcontrols.com/uploads/files/mewukisinibor.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1607e48da049a9---75039829018.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b9bee8b6b1f---42991597045.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611cfe811d65b---zazexabuxoji.pdfIn PDF document text
    • https://hgqq.hk/tony/churchofgod/ckfinder/userfiles/files/laxasirexuvuma.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/files/bigorenamefasiguzuxotik.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/dolenudujeriluv.pdfIn PDF document text
    • https://ipic.vn/userfiles/file/rimexinasisaxafukiranog.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611d1de260a66---76232085829.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/l7bjlhitacg0ltdtvdj4811b25/ritidavejamuwekuj.pdfIn PDF document text
    • http://chanhbon.vn/media/ftp/file/lixes.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/077kid2a58jlrvi439ohp9v6m3/filatezisowumul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=types+of+joints+in+electrical+installation+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_off0000f2d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D5 10820 bytes
SHA-256: 098e72b6ea687e6a97b09aeb931d565a04162f318726e8eaa2799666d39fa16b
font_01_sfnt_off00010be9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BE9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000123fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123FB 17444 bytes
SHA-256: 3c4fa4da0bf5cc63f01ca0550d8fa87097326fb99c5ad71f62ec30488d975eb0

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