Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5a12b70e303b19b…

MALICIOUS

PDF

80.4 KB Created: 2021-09-08 10:30:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: cd9a1936285a6978619c3c8d02f2d2de SHA-1: 98ee85591cb1f6c1297079a2d62a46c1a4d2db7e SHA-256: c5a12b70e303b19bbf5e85093c3cb7db2682da0c319b3f2aba6db7045b4c6ca1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to domains that appear to be compromised CMS upload storage. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for these links. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • 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.
  • 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://cngwalk.com/fckeditor/userfiles/image/38561526250.pdf In PDF document text
    • http://budoprojekt.eu/obrazy/file/fiduzivet.pdfIn PDF document text
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/44479814958.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/77789821722.pdfIn PDF document text
    • http://notariocprietoa.com/notaria/documentos/files/30514683216.pdfIn PDF document text
    • https://telewebmarketing.com/FCKeditor/file/76613766827.pdfIn PDF document text
    • http://pressvaluation.net/userfiles/file/45057256769.pdfIn PDF document text
    • http://architetturaurbanistica.it/userfiles/files/liwovaporawowog.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160822c5d42c7b---59748379260.pdfIn PDF document text
    • https://www.ideaklinikankara.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071e81ce5b63---kogazejofa.pdfIn PDF document text
    • https://idealist.ro/userfiles/file/33136958142.pdfIn PDF document text
    • https://tungqibiotech.com/upfiles/editor/files/19526362138.pdfIn PDF document text
    • http://metrocars.london/survey/userfiles/files/33952335708.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ed9d0c748de---neletinevibudonaxex.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/2dc86fe66cd197081959a4b58018f609/42397130823.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/161214ecbc384c---tixajarumisogomusowagas.pdfIn PDF document text
    • http://mexvp.com/ckfinder/userfiles/files/tikofowulawapabotipo.pdfIn PDF document text
    • https://schmitz.cz/res/file/5312483103.pdfIn PDF document text
    • https://hostsolutions.ro/app/webroot/files/userfiles/files/42537940031.pdfIn PDF document text
    • http://elmbbq.com/uploads/files/nanosoxerixivabupezawud.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16070b7d5923bd---60218703523.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/1p0gfnmg8vs9kmgl3qv85fobtp/61393476329.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=warszawa+mapa+turystyczna+pdfPDF 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_off0000d59c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD59C 10744 bytes
SHA-256: 9fc4c906d4f3c08bc10848718052f8641e8db9a628dffc03afa357aea66fb895
font_01_sfnt_off0000ee73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010685.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10685 18124 bytes
SHA-256: 39823d071844b121cd3555891a0efca8b8557ab31a35998c83ad3f8cb28ca78b

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