Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3591faf70be4425…

MALICIOUS

PDF

69.3 KB Created: 2021-09-30 19:38:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: d8876b436e35fdd719eeae75a436bb83 SHA-1: a72c43d743d493bfc016537d37e5916cf1db0673 SHA-256: c3591faf70be4425a81626797161c86f01885f0fca2962b376722d7d09fd21a3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed for malicious redirection. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. The presence of these links suggests an attempt to lure users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • 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.
  • 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://potya.com/60292789367.pdf In PDF document text
    • http://energy-labels.com/userfiles/file/35689349470.pdfIn PDF document text
    • http://chrislahoda.ca/userfiles/file/33260903840.pdfIn PDF document text
    • http://kiiga.ru/userfiles/file/dekedoxorefojigawa.pdfIn PDF document text
    • https://22importexport.com/eimages/file/dajisut.pdfIn PDF document text
    • http://studiotecnicodambra.eu/userfiles/files/46349027207.pdfIn PDF document text
    • http://ct-tci.com/cttax/userfiles/files/68928871594.pdfIn PDF document text
    • https://apexsafetyproducts.com/ckfinder/userfiles/files/78429454982.pdfIn PDF document text
    • http://vakantie-noordlimburg.nl/ckfinder/userfiles/files/fufegabakeg.pdfIn PDF document text
    • http://www.yevres.fr/ckfinder/userfiles/files/34233895827.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142b9a6cbcf9---68437707248.pdfIn PDF document text
    • http://sinostandards.net/upload/files/xemopubinokap.pdfIn PDF document text
    • http://arkystudio.eu/userfiles/files/selugugo.pdfIn PDF document text
    • https://ssmahavidyalaya.org/lion/uploadedfiles/fck/files/file/51911907767.pdfIn PDF document text
    • https://baxsporthorses.nl/userfiles/file/49554831303.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c7927e8ea3---37348665947.pdfIn PDF document text
    • http://temple.mo/userfiles/file/gosevakovefi.pdfIn PDF document text
    • http://ms-beauty.com/ckfinder/userfiles/files/75085421390.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161498beb0d5c8---sixafige.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/13912236706.pdfIn PDF document text
    • https://habibitours.net/ckfinder/userfiles/files/65326430797.pdfIn PDF document text
    • http://efuturesthai.com/uploads/file/tapev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=somewhere+in+time+putlockerPDF 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_off0000aedd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEDD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c6f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6F4 10660 bytes
SHA-256: a32b347c18e40b3e438a70df1733f24992cdd0b5e38bd06082f18114d715adad
font_02_sfnt_off0000df36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF36 15296 bytes
SHA-256: d881785c3c6b1633f1ed70f323a885ca72620f9bb0f3b303a29cee9902eb8319