Malicious PDF — malware analysis report

Static analysis result for SHA-256 61e5172ff1dbc24c…

MALICIOUS

PDF

87.1 KB Created: 2021-07-03 13:00:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8b3ded0738363721f7708940b4edb2b6 SHA-1: ebc7ed5240cc6e88f044df932076efdc2b9e9f53 SHA-256: 61e5172ff1dbc24c4dc7dd62e05f10e5d2f0928b49f79fab61ce1c12330353ff
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the links and the PDF structure point towards an attempt to exploit users via external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://cructi.ru/uplcv?utm_term=you+got+the+feeling+that+i+want
    • http://ackerviewguesthouse.com/userfiles/file/soxes.pdf
    • http://burnettefamilyreunion2021.com/clients/867108/File/79770952858.pdf
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1607b7426a863d---96615283882.pdf
    • http://atdawnwelift.com/userfiles/file/ruxujixarakifulepalula.pdf
    • https://bangprice.com/bangprice.com/beta/cms_image/file/31906668912.pdf
    • https://sanidom.pl/img/file/gamefenunofuxotozu.pdf
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/474061677e574a5ac323b58969bfef8f/22749101038.pdf
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/343e922419ddb972a1ee02c48aab6800/majelizi.pdf
    • http://alemotta.com/resources/original/file/48680971382.pdf
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/16acebdeb8ed87cabc5a1f5b0543de76/dawofujogoruravarutopo.pdf
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607564356fb2d---tojagobukixuk.pdf
    • http://hzdshg.com/images/upload/File/bikanulutekusezetorip.pdf
    • http://sugarfree-gelato.com/upload/file/11288885558.pdf
    • https://www.dartmusicfestival.co.uk/wp-content/plugins/super-forms/uploads/php/files/693987c04ed4f564cb182b8083dc093e/8613406096.pdf
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/hgugorml1hrgk404v57fgfgtq7/jasozimidivudoxebojibez.pdf
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b2611757ee5---fotikor.pdf
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/o6ttvh911mibp5n0b85ldfq4lk/wefamasolunivosaza.pdf
    • https://denizlihorozu.com/resimler/files/89567829314.pdf
    • http://trevelsi.ru/ckfinder/userfiles/files/81217436205.pdf
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/667a07afb748a01dd98e39057d4510ab/41374201523.pdf
    • https://gtselect.fr/ckfinder/userfiles/files/73301645541.pdf
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160caccb8761fa---16657315132.pdf
    • https://szabobuszberles.hu/files/files/55168983586.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f396.bin
38fe984e5728aceab24d457a28a3e38bf09102cf13991a0a5c890093de53b779
pdf-font-stream PDF embedded font (sfnt) at offset 0xF396 10392 bytes
font_01_sfnt_off00010b19.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B19 16792 bytes
font_02_sfnt_off0001232b.bin
341927dc58beb9fd9236d88d193d15e2cebdb8a852fe65b0ec8e025b40c4dc0d
pdf-font-stream PDF embedded font (sfnt) at offset 0x1232B 17024 bytes