Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d3b2252bc9e96b8…

MALICIOUS

PDF

82.9 KB Created: 2021-08-18 23:57:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 46c9e9c046f533dbc8e6138d0cc8ac76 SHA-1: fb1cdca377564a0c9648c455fa24e548c5377ffd SHA-256: 2d3b2252bc9e96b8d861164e6c2b2d5a16bba2a1b64e6ff5817cab1b658ce2ef
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm with numerous URLs pointing to various websites, many of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the structure and URL patterns suggest an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://www.swissfillon.com/wp-content/plugins/super-forms/uploads/php/files/a3ca0e82b20a413b2cbe06b35fda3b79/95995417995.pdf In PDF document text
    • http://roycraft.ca/userfiles/file/nuvoxufalajarumumadafom.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/91617182058.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607f645ca09e4---60636455587.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/16371348120.pdfIn PDF document text
    • http://www.peretprod.ro/content-images/file/fimajuneledimoguzosom.pdfIn PDF document text
    • https://prospr.fr/ckfinder/userfiles/files/xufuvete.pdfIn PDF document text
    • https://topplene.com/upload/ckfinder_temp/files/20210620110448.pdfIn PDF document text
    • http://poorclarescork.ie/images/rujugebuditof.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16105b308805b6---72470260805.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb20e749542---kefazowilexok.pdfIn PDF document text
    • https://istanbulbalbir.com/upload/ckfinder/files/pigazox.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/160a7b3bd474af---94845488657.pdfIn PDF document text
    • http://tgtech-auto.com/userfiles/file/veripokepujufaxawef.pdfIn PDF document text
    • https://tedvandergulik.nl/userimages/file/67578947729.pdfIn PDF document text
    • http://abwingssuffolk1.com/uploads/files/22207853265.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d1311b849---82086178295.pdfIn PDF document text
    • http://waukeganeast1980.com/clients/877304/File/8396788196.pdfIn PDF document text
    • http://apsara.ru/userfiles/file/15326656188.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b939a0d2e2a---nenedoma.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/wurixozowamabiwu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=aquamarine+full+movie+in+hindi+download+720pPDF 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_off0000def7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF7 11168 bytes
SHA-256: 130a4ee413b9ae217508ca5653ff240fa07cf90f66d6fdb9d3d66154d8d6a3f8
font_01_sfnt_off0000f8b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B4 16900 bytes
SHA-256: 0dbaf7d8965b4111d2fae9ef4054489c124fb876fc03497a384d66ca8121c568
font_02_sfnt_off000124a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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