Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5391e83a38411f9…

MALICIOUS

PDF

82.5 KB Created: 2021-09-12 14:26:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 30bb38ed0b5078278a068b0d528fb4cf SHA-1: 56805a46e3a980449321ffc292ec3ecff213de79 SHA-256: c5391e83a38411f9808f217f882d36964bf6d8e5b7278a0eb36a8e66a8b4e725
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and is identified as a link farm, with many links pointing to compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via the linked sites. No scripts were extracted, but the document structure and URL patterns are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://coretry.ru/uplcv?utm_term=free+psp+games+for+emulator+android PDF link annotation
    • http://seteo-dechets.com/images/file/18359988495.pdfIn PDF document text
    • https://sledovani2.gpshlidac.cz/www/userfiles/files/fopag.pdfIn PDF document text
    • https://projekt-lesen.de/userfiles/file/jojapabezomex.pdfIn PDF document text
    • https://tspinstruments.com/cache/fck_files/file/37615381933.pdfIn PDF document text
    • http://cancercareresearch.com/userfiles/file/1666701995.pdfIn PDF document text
    • http://trumoi-khutrung.com/upload/files/zebofavevovuva.pdfIn PDF document text
    • http://thainightjob.com/ckfinder/userfiles/files/39779201147.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/16132b77b2daa4---62764191062.pdfIn PDF document text
    • http://hp-cnc.de/uploads/files/20529025203.pdfIn PDF document text
    • https://jagamimpi.net/contents/files/35136554323.pdfIn PDF document text
    • http://schoonhovensvrouwenkoor.nl/ckfinder/userfiles/files/96967797223.pdfIn PDF document text
    • http://rqconsultores.com/userfiles/file/kilafelixiva.pdfIn PDF document text
    • http://www.pes.edu.mn/ckfinder/userfiles/files/xazuwexukimawa.pdfIn PDF document text
    • http://eiak.org/upload/editor/files/41155859226.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133c4d0bed27---28033559221.pdfIn PDF document text
    • http://agriturismocorteerbatici.it/userfiles/files/14240414077.pdfIn PDF document text
    • http://vnationwide.com/userfiles/files/60682374483.pdfIn PDF document text
    • http://vonschickenfremont.com/uploads/files/lewonasekiwutivagi.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/dff6ecab13960588768c67afc79b07c0/pufoxogugujubidonurifurub.pdfIn PDF document text
    • http://zehanbiopharma.com/upload/files/56629713067.pdfIn PDF document text
    • http://skupka54.ru/upload/m/22283773468.pdfIn PDF document text
    • http://www.impactit.in/ckfinder/userfiles/files/733716676.pdfIn PDF document text
    • http://flapboxes.com/userfiles/files/jamokef.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_off0000dfe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F5 17004 bytes
SHA-256: 4dc168e8c89ee8df7a11f1e3e721f6f9ff23386961dda7b5970d753c4919282f
font_02_sfnt_off0001235e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1235E 10920 bytes
SHA-256: 63087d7b08a6553f039e070eca8634745daa506d285194bfe666d4985bb69040