Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f2a6f4233010ff4…

MALICIOUS

PDF

72.1 KB Created: 2021-09-23 05:12:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5bcabec0927c8f5cbc8fcbff2a4249ec SHA-1: 128d33d1a7c179a2419a137e52bee7cf15e86fd1 SHA-256: 9f2a6f4233010ff459926727ad811434080dd43e958b9f7a9a6f8a143c99243e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and links to compromised CMS upload storage, suggesting it functions as a link farm to phishing or malware distribution sites. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating a tactic to distribute links across disposable hosting for SEO manipulation or to obscure malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://crysiq.ru/uplcv?utm_term=gta+vice+city+cheat+apk PDF link annotation
    • http://attlas.center/userfiles/file/87275085693.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/161487b9d2e6e3---getosonaxujosumaju.pdfIn PDF document text
    • http://veszpremlizards.hu/_user/file/62673197973.pdfIn PDF document text
    • http://clinton.abwingsmd.com/uploads/files/jadamomubijebasevebujufos.pdfIn PDF document text
    • https://habibitours.org/ckfinder/userfiles/files/97043460546.pdfIn PDF document text
    • https://postelezmasivu-olomouc.cz/ckfinder/userfiles/files/73489100605.pdfIn PDF document text
    • http://sbriz.ru/userfiles/file/kopifafej.pdfIn PDF document text
    • http://chernogolovka.inhome360.ru/admin/ckfinder/userfiles/files/73094927534.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/54438870502.pdfIn PDF document text
    • http://thermcom.cz/userfiles/file/89927346707.pdfIn PDF document text
    • http://shrlie.com/upload_fck/file/2021-9-12/20210912215758316819.pdfIn PDF document text
    • https://www.whoamiandwhyamihere.com/ckfinder/userfiles/files/1291466049.pdfIn PDF document text
    • http://sushikyototogo.com/uploads/files/5189874693.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/1650352364.pdfIn PDF document text
    • https://www.gurkhasfinance.com.np/ckfinder/userfiles/files/84235417165.pdfIn PDF document text
    • http://www.sas.edu.mn/ckfinder/userfiles/files/99023390515.pdfIn PDF document text
    • http://space-edge.com/upload/files/39324551695.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613a85ccc71e8---bajasalominozi.pdfIn PDF document text
    • http://doo-san.com/userfiles/file/20210912192024.pdfIn PDF document text
    • https://portugaliaimagyarok.com/ckfinder/userfiles/files/91823245702.pdfIn PDF document text
    • https://www.alugutader.fr/ckfinder/userfiles/files/91152851837.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/24d81ad3e6b559787902ad2f41a91682/3448159426.pdfIn PDF document text
    • https://kluchar.net/klucharnet/images/file/32641248521.pdfIn PDF document text
    • 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_off0000b92d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB92D 10244 bytes
SHA-256: ee0419bf9bea88b345b0ba07ace8fdb80423dfd7f124df6f160dca7d29651b99
font_01_sfnt_off0000d06a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD06A 16556 bytes
SHA-256: a30ee49d9122a1620fed2c4dc127323e161d4cfb3dcc0623dcc92a2ed5cc94c3
font_02_sfnt_off0000fad6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1