Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad5869de6deaf89f…

MALICIOUS

PDF

93.8 KB Created: 2021-09-07 07:14:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3c3ebddb0caf4e40d2f4dcdf1957fc5e SHA-1: 5e447587535dd8c29d407677b28277b2b4d75ea7 SHA-256: ad5869de6deaf89f1d0b3e3194520789adb1b8bde531289d72cfed0f36c6409c
192 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that exhibits characteristics of a phishing lure, including urgency language and a call-to-action button, designed to trick users into downloading further malicious content. The presence of numerous links to potentially compromised WordPress sites and the ML classifier's high confidence score indicate a malicious intent. Although no scripts were directly extracted, the PDF structure and URL patterns suggest it acts as a dropper or redirects to malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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.
  • 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
  • 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://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160f31a884e9de---83454203726.pdf In PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/qvac2189nqec5p4p8eqkpfthkd/meroluzaniveledo.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/51239109168.pdfIn PDF document text
    • http://oresteruggiero.com/userfiles/files/85566556482.pdfIn PDF document text
    • https://copab.tn/216mag.svn/uploads/files/409648260.pdfIn PDF document text
    • http://sns.hu/_user/file/61318283973.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/fe1b705d996d6d4b36c130a76b2721ad/rifujovajupejital.pdfIn PDF document text
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/96715e664ffdb1ff82acc81417be57c5/58157328544.pdfIn PDF document text
    • http://logistra.fr/ressource/site-image/files/40381660019.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/f031f1189a9ebdab3ebf8457c935b134/vufuwogebazawe.pdfIn PDF document text
    • https://www.micd.edu.np/ckfinder/userfiles/files/damolov.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/7301f176781fd31babdb87d9d9739114/21623524280.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/848f1d87ee22e3b354c88d97f355083b/83402895813.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088463f667a8---lajasuxanap.pdfIn PDF document text
    • https://brs.jo/userfiles/files/28444403993.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/vlucteubeck52q1p855i9s7bv4/bukifunor.pdfIn PDF document text
    • http://universalestetic.com/userfiles/file/xatogeroki.pdfIn PDF document text
    • http://blesk-stroy.ru/userfiles/files/potimozadax.pdfIn PDF document text
    • http://careerdynamic.com/clients/3/3d/3d9dba0a3645e5854abf1db7654b9c86/File/samefawub.pdfIn PDF document text
    • https://barrierball.cl/ckfinder/userfiles/files/zobup.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/52b915u0ffmhafbcvtjs8n7q6b/83224518266.pdfIn PDF document text
    • https://vanvoorst.info/uploaded/file/radob.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1612a5c86cfc45---diviwu.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/86862f1151759d9ec2593f824e00233c/84502383604.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=rrb+ntpc+official+syllabus+2019+pdf+downloadPDF 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_off0000fdff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDFF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011611.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11611 21240 bytes
SHA-256: 32b5cd22216766b031ce0abbe2f65d080c36fe792b417e58444c6710d4e28e1b
font_02_sfnt_off00014e5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E5E 11428 bytes
SHA-256: a40b5e20dd3512e97020006e4d4a597674df7059d025cb604f2f4c8eedb77d8b

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