Malicious PDF — malware analysis report

Static analysis result for SHA-256 177a002fbf42cb63…

MALICIOUS

PDF

81.3 KB Created: 2021-08-19 09:50:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 17a1a2a79f45a418c917e3c0c9d558ef SHA-1: 1ccbec4f1db8ee2a4d27c6c09cb78441b306d5e8 SHA-256: 177a002fbf42cb63032b1f67a5d65d153ed120d269a648a52ba8bcbe21b64e8d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. The heuristics reveal it contains embedded JavaScript and acts as a link farm, directing users to multiple compromised WordPress sites and other potentially malicious domains. The embedded JavaScript likely facilitates the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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.
  • 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://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/ed3b28c2b26ad1402d92e1c5a64ccb4d/34126795988.pdf In PDF document text
    • http://extintoresorigen.com/images/editor/41584339899.pdfIn PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba999d1dae9---tipusewipumetimar.pdfIn PDF document text
    • http://gapp.fr/medias/files/visazanu.pdfIn PDF document text
    • http://auburn-properties.com/userfiles/files/95001671530.pdfIn PDF document text
    • http://www.como-grup.ro/fisiere/file/41180998288.pdfIn PDF document text
    • http://ricarda-allegra.de/userfiles/file/35922294702.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/nidikutekemowuzupus.pdfIn PDF document text
    • https://octvads.site/js/ckfinder/userfiles/files/34293153005.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/4445e29da39b5db2bc725791e704b3f3/20805490121.pdfIn PDF document text
    • https://www.traitagri-solutions-alternatives.fr/ckfinder/userfiles/files/14728966634.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b18d1e3f7ee---68984900014.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/332f1b674c043876d113bac2a96a9762/gibosovezawu.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d4ddcc51805---wanedinawazazebufozatipu.pdfIn PDF document text
    • http://arablift.net/userfiles/file/netusotogemugufulizupo.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/bf3ef6e05bb57033033d01ad584bdbb9/tonuvabitifavikiraji.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/87060293464.pdfIn PDF document text
    • http://everbeenmagnet.com/js/upfiles/files/botupizojifabokem.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/jg612d0dchottoai6q3p70e4t6/bexulomasesefazimuzex.pdfIn PDF document text
    • https://x-software.cz/data/file/67013200412.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+program+rca+universal+remote+rcr414bhzPDF 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_off0000da5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA5B 11396 bytes
SHA-256: 1b954de1d0ec66dec1354acc6ef6857029c6a2e4a588293983e54e4dfad0a2eb
font_01_sfnt_off0000f500.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF500 16380 bytes
SHA-256: 3aa82c9e3ea2c942154356c3a87afa2ded7b3cd8357aa96d8f4bb0f267f341bb
font_02_sfnt_off00011f2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F2F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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