Malicious PDF — malware analysis report

Static analysis result for SHA-256 671e61ad130a7504…

MALICIOUS

PDF

88.8 KB Created: 2021-08-01 11:11:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: af59bc12666e2b0341d1676bfcb7f3c6 SHA-1: 393a7ad6c6f12a25196b7a3b42037d9eb9aadd40 SHA-256: 671e61ad130a750438609220ca78d43bd0a2bfacb859782c281ab453194bb00a
192 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document contains embedded JavaScript and multiple links to external resources, many of which point to compromised WordPress upload directories. The presence of a callback lure heuristic suggests the document is designed to trick users into a fraudulent interaction, likely leading to a download. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 9

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.bufolari.com/public/immagini/file/68426494259.pdf In PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dbb5609fd95---zuduk.pdfIn PDF document text
    • https://bomberosdenavarra.com/userfiles_nexo/files/61570031480.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ae52840f1e2---97492278935.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c630764b5d2---75689393050.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/71dub9la0e1nhtdrs9dr5qnha9/gaxuruvemokowaz.pdfIn PDF document text
    • https://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/267aa11e074c4457f4a4f0730331f8c5/fufozabirivomikodinijegif.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/kexajewimufubufajewagoja.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/663n7pli451uqbvu1e8pngva7d/89693465312.pdfIn PDF document text
    • http://geose.ru/userfiles/file/jawesopuj.pdfIn PDF document text
    • http://partnercable.hu/files/legikubu.pdfIn PDF document text
    • http://haumeaonline.com/userfiles/file/zeluduxegigitubanufosapad.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba5a06b4e21---sotiwipituxise.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5093d8c6e---75543421259.pdfIn PDF document text
    • http://tfforming.ru/d/files/bemupikodetawavajufir.pdfIn PDF document text
    • http://www.iece.in/userfiles/file/latavupageval.pdfIn PDF document text
    • http://drjoecarver.com/clients/49355/File/877329389.pdfIn PDF document text
    • http://cohensevents.com/clients/74638/File/96947392729.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609769f765e64---90609326100.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/vpnm81v1mltt8ss6n15ea7m14s/lozesixidipo.pdfIn PDF document text
    • http://budoprojekt.eu/obrazy/file/98729696157.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/240763d89f04b2a0f2cf4f4e01a77efe/39296001291.pdfIn PDF document text
    • http://technoauto.jp/js/upload/files/43616372733.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=how+to+apply+for+ews+certificate+in+delhiPDF 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_off0000f37c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF37C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010b93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B93 10908 bytes
SHA-256: c0612d6dc3443ca53f76570a58357f80d850874bc6d33d6bbc446b6da16834b5
font_02_sfnt_off000124ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124CA 18400 bytes
SHA-256: e9fd37043c673515dc7f5bda3c9ea97ca88e7d5c5fcb6fd26274d08ca6fcd945

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