Malicious PDF — malware analysis report

Static analysis result for SHA-256 2afab7eba53ef5c0…

MALICIOUS

PDF

93.0 KB Created: 2021-08-05 15:56:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 49e227ab910ad133373071b4b169741e SHA-1: b18ee40da9fbdab7dd37b69cf06dd6cf051f368c SHA-256: 2afab7eba53ef5c0bba49da6e187d4929addda536e0fbd977e0d2af2ce4efd79
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The presence of multiple external URI heuristics further supports the attack pattern of directing users to external, potentially harmful, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9959

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://eobliecky.sk/userfiles/file/duxiradarasim.pdf In PDF document text
    • http://matras-devison.com/upload/file/pubuwinafe.pdfIn PDF document text
    • https://www.pharmawell.eu/ckfinder/userfiles/files/45867196469.pdfIn PDF document text
    • https://creteotels.gr/FCKeditor/userimages/file/pagiruragipudapof.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/pawaretuwaranexezereg.pdfIn PDF document text
    • http://nessium.fr/userfiles/file/xolukoxesafube.pdfIn PDF document text
    • http://tecsun-moscow.ru/docs/file/21394290261.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/c52d554ce33cfeb45e514c4d72b24394/dogadogex.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/9658b560a338db755bec56b75da2d498/90145478488.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/5fd13be9254b8f7c8223bd6895914eb4/53940739832.pdfIn PDF document text
    • http://farmaciafici.com/userfiles/files/60554102042.pdfIn PDF document text
    • http://kapli74.ru/upload_picture/72777148868.pdfIn PDF document text
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/7cde9ab3aa58ebe21f2fd9db3d711eee/bovinetojex.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/f3f318fba0ca39bd24a86a338e946d3b/27475332907.pdfIn PDF document text
    • http://cnokorea.com/userfiles/file/95282393950.pdfIn PDF document text
    • http://md-servicios.com/userfiles/file/femimozawazatoregi.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/3k9dntaot19ramgk2vlj3u33me/nenilusuzugex.pdfIn PDF document text
    • https://eventpro-kontraktorpameran.com/uploaded/files/81323296016.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ddda7ae74f---nodugufuzuxukevofuxe.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/9e534d38598c682cc9c3071a5e791fa8/93091953608.pdfIn PDF document text
    • http://greece-ex.com/images/blog//file/5406970928.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+use+bluedriverPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f238.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF238 17696 bytes
SHA-256: 2b948620c8dd1bb228ae46fb573e16e37faf7896b661ac7f5cd952e5740af910
font_01_sfnt_off00012105.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12105 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013916.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13916 16144 bytes
SHA-256: fcca37035df06e555c2991ff65faa0e8497ca6423bee408ebc46b3aef925b516
font_03_sfnt_off00014e96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E96 10356 bytes
SHA-256: 9b666dc1b359842bd6e1a9cf218ae7f6502c1d1c10e5038bb4b4e5bffb167702

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