Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9d5a0e37d6e3436…

MALICIOUS

PDF

87.2 KB Created: 2021-06-27 21:33:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0f5925e602c90987035dba93d10567b9 SHA-1: 43037d41bbf9b113734cbe2e022da587216e7b10 SHA-256: f9d5a0e37d6e343629f61c98dfac5fed82f62010b22fb4eee99e1c89a4eb76f4
96 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting domains. These links are likely intended to lure users to malicious sites for phishing or to download further malware. The ML classifier strongly indicates malicious intent, and the structure suggests a link farm designed for obfuscation and distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 5

  • 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://catamma.ru/uplcv?utm_term=english+kings+and+queens+since+1066
    • http://hopkins1983.com/clients/861771/File/lumat.pdf
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/2131c0c09c302da91661b1718f4b4920/serajexosogelofoziz.pdf
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4581f1a0e4---tiluwapozazarigekubov.pdf
    • https://inverpalmas.site/aym_image/files/nimadawufunixige.pdf
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ccfc47745d---dupubirefan.pdf
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16080f41218fb0---texawezuleporomasak.pdf
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16070c8a035c89---13762670922.pdf
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c3c79eb915d---pezosoda.pdf
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a28d4f477d9---kevamukukosixi.pdf
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/uuth3eksfst7nr09lq511jbdi1/letorusinizepi.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ce12d743c78---jolozakad.pdf
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e82d75f28a---pomevalibodarojela.pdf
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d31bbf30fe2---45248123643.pdf
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160cbd91541a99---67544601.pdf
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8627173a1---godawag.pdf
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd8961ac3e---milaxefepaxix.pdf
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/dc31463ba344fa89663821d5661db63c/bagakarufufekewapudiro.pdf
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607c393f08c31---28171500464.pdf
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083ea0ab185b---79415762658.pdf
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/fdb85ce410ebfcbee3a5eff11b6eeba0/72647315994.pdf
    • http://sonkertrail.org/clients/9/92/9260a3c387aed4615f72c72c3a1da295/File/24812855238.pdf
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a05880bc115---73514618153.pdf
    • 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_off0000f216.bin
776104b5a0a84dc1536f9931497763d8e9a18c47af2ba368fff439703e25192e
pdf-font-stream PDF embedded font (sfnt) at offset 0xF216 10992 bytes
font_01_sfnt_off00010b05.bin
48d3aa7d543170b5ffa33ae3754a38954ee61dac919374254525f51098324a36
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B05 16884 bytes
font_02_sfnt_off000136ce.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x136CE 16792 bytes