Malicious PDF — malware analysis report

Static analysis result for SHA-256 dff61f3b60b19e2a…

MALICIOUS

PDF

113.6 KB Created: 2021-06-26 14:19:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 3ab57051f76baea902fbf7cd97fc65b8 SHA-1: 7da1306ce09068590395dce875fa9a3182ef9f91 SHA-256: dff61f3b60b19e2a682409d397db71043443c35c399c6c3c6bb7802f540c9a4e
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting it's designed to redirect users to malicious sites. The presence of urgency and callback lures further supports a phishing or scam-related attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

Heuristics 8

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://oniceh.ru/uplcv?utm_term=commercial+vehicle+valuation+guide PDF link annotation
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/pblmhler1gpnvguqrnc1b2u17o/wumejisajuzinukufotikor.pdfIn PDF document text
    • http://proxima-design.cz/files/file/61942823686.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16071d52b55f22---9839181065.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/kiwekeligegewimexa.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16076be724e3fd---87668438815.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160be33823fa9b---63218973852.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081baf54810c---82840558954.pdfIn PDF document text
    • http://avgdesign.com/userfiles/file/patot.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/531b7fd3aab53ef24d6bf3a6d0c7067d/pisupomusitin.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086e0ee056a3---97297648670.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/5eu9lbi4sns5vcvf4q99kris95/xorabegobusapagojom.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/57d83c73b4684735bba0c18d84340333/gaminemugugulite.pdfIn PDF document text
    • https://cremyco.com/app/webroot/docs/file/puxiborisamenej.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/9dd2d9eb5bc32506230d7ea32cc2059f/81908424378.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/291d753625deb471cd6c13b00895751a/sefogomononu.pdfIn PDF document text
    • https://sjalikave.hu/pictures/file/65717550220.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f285d0ba20---68296741497.pdfIn PDF document text
    • http://vishwkarmaenterprises.com/webroot/img/userfiles/files/85304701099.pdfIn PDF document text
    • http://espacioschillout.es/images/admin/file/zodulewafugiwudegez.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/616bb5be01abf251e7c062d17cfa9d1e/ronexageki.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/a6228d005b1c15cabcd56ff19c257eeb/7981306235.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1471c9bce3---jajugisobafilab.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c3e70798a85---jafalejuvutibaruf.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/28510307954.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/37ccc66eaf74d768339f2a022c21e5b9/gudoduf.pdfIn PDF document text
    • 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_off00015996.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15996 10848 bytes
SHA-256: b30a05b0175205a3a486956ed8bf5dc47a0dd51b3e717e1003f1a063909bb3cc
font_01_sfnt_off0001723d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1723D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00018a4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18A4F 17840 bytes
SHA-256: 61cb3d3382ceb28aa5f5f95b97a785cd2c331bb3cfa4a3a79f6d08074222c1b2

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