Malicious PDF — malware analysis report

Static analysis result for SHA-256 783ca91a89d93047…

MALICIOUS

PDF

73.3 KB Created: 2021-07-02 08:51:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4cbef4771a5ba13a9abe429ca8cbd688 SHA-1: 5b75735ef6dcda15cf0874a41f53509d24f308f8 SHA-256: 783ca91a89d930477f120ddb039b0b75036c2c8dfdce5c40f7865d7b4ef2e8c5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many of which point to websites hosted on compromised CMS platforms or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://stepasidemedical.com/images/uploads/file/dazoxumerodojefonuku.pdf In PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/c190efb796fe944c56679cfc590d7437/jumorotaxedikakegibukeg.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/44e832a1f6ba9b016f2f5fb272979e52/93161985233.pdfIn PDF document text
    • https://samarpanbharat.org/trila/userfiles/file/72936475507.pdfIn PDF document text
    • https://thekolkatapackersmovers.com/ckfinder/userfiles/files/25176879078.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b35a1fb4b7b---35652469935.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/37848108113.pdfIn PDF document text
    • http://cortabellanews.com/userimages/93214906880.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/2d21b9cede0b147298bfc833d8ffc338/66296094989.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/40e951242412d4191f0e523de3496e6b/78427029665.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074f7934f7e9---21924625965.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160810bc1240dc.pdfIn PDF document text
    • http://xn--80aaffebba2apgigwiiececnggk9e4k.xn--p1ai/pict/file/42243901631.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160b47d40b0196---74257657789.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/2ab9586fa59ddb51e0fe6f69b594a67c/vilipo.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2fa102411c---lovogarililodubo.pdfIn PDF document text
    • http://mawaevents.com/uploads/file/kizezosadar.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/2abb5b22a6ecd5ab1e5b89a2b55caf7d/sekedabusu.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac2e2b310fa---60900046596.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/0b2539caefe6d5c0dbdacf293c3fc621/jijunag.pdfIn PDF document text
    • http://ugrctrani.it/userfiles/files/70937708009.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16081b3cdf307d---5925742585.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073a08c74278---63542779360.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=old+old+countryPDF 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_off0000bdd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDD1 10048 bytes
SHA-256: 6d2e2ce5f4daf1f9068a2a13cf72347afb288c71f912519fa93b558f6d6d88ed
font_01_sfnt_off0000d44b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD44B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ec5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC5D 16372 bytes
SHA-256: b556ec4750304f68d0a1ffbd7766a1719e71ca6117c9a9c878bb2f52ed9397c7

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