Malicious PDF — malware analysis report

Static analysis result for SHA-256 b58a1fa1d4fb0ae4…

MALICIOUS

PDF

76.3 KB Created: 2021-06-25 13:54:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3d687b17d879026d14b0013a9836e800 SHA-1: 2d88f649352135e06785e0bfe8cbae92a5ecc700 SHA-256: b58a1fa1d4fb0ae43c5ec61a02da50d344d011f7c8f52e049ae89453c32adbc4
196 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely involving exploitation of PDF vulnerabilities to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://theemasternetworker.com/ckfinder/userfiles/files/runuzekamojovefos.pdf
    • https://radmangroup-ye.com/rgfiles/file/pavuxosesima.pdf
    • http://china-engine.net/ckfinder/userfiles/files/vixezabativid.pdf
    • http://studiomedicoveterinariobellucci.eu/userfiles/files/77041731364.pdf
    • http://bethtikvahevents.ca/clients/2/20/20a91c0cb94b02964b0d1c5d980f1596/File/wojopododav.pdf
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609cf5bb3a6b8---80651163036.pdf
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/c0935aaf9dba1b1e0772e8f4eae4a2d8/tuxudubolila.pdf
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/f1b73dc464630ad40484fed672f305dc/wejorukutigegozezuf.pdf
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1d2e4fadd---febeguvekujiderurakarun.pdf
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/194807a82cf2f3522a62a55148c615f4/rewenotapolupu.pdf
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160a536ec6c85c---51997409377.pdf
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a47717245db---13464290099.pdf
    • http://dinskayarealty.ru/media/file/48243491489.pdf
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608e67d04ac69---zazabivajeze.pdf
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/9ec8deea04d6f4f63341f149f8858bf4/tetonuzib.pdf
    • http://alexanderjamesbackcatalogue.com/userfiles/file/41129691181.pdf
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b2cd3eccc01---46882453746.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=novena+of+confidence+to+the+sacred+heart+of+jesus
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c2e9.bin
29891ac3e3a1ee669ce7d9f68ceefc2ede5d0ea9e313b77a3ce6c06bb4e4e6da
pdf-font-stream PDF embedded font (sfnt) at offset 0xC2E9 10800 bytes
font_01_sfnt_off0000dbbf.bin
99d8b4b823bdff0a731238be879a34d270db72e32a1d4a07b3099f93666c18f4
pdf-font-stream PDF embedded font (sfnt) at offset 0xDBBF 18960 bytes
font_02_sfnt_off00010c28.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C28 16792 bytes