Malicious PDF — malware analysis report

Static analysis result for SHA-256 35a8807d03b3bc06…

MALICIOUS

PDF

85.2 KB Created: 2021-07-05 01:47:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: acc66c8cad25deaf9da19c549f3dc43d SHA-1: 1346ab3addf5606dbcb5f7a88a433a2a352d614c SHA-256: 35a8807d03b3bc060339b3e7a1940d021e7ca59c73a2b5886626ef55cc040c2c
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous embedded URLs that form a link farm, with several pointing to compromised CMS upload directories. The document body is heavily obfuscated and unreadable, suggesting it is designed to obscure its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • 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 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://aarogyamedico.com/userfiles/file/58216247958.pdf
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160d08d970469a---66489942596.pdf
    • https://alakharia.com/public_html/userfiles/file/95577391938.pdf
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c24bf864a5c---xupiwumevumoz.pdf
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/ek9ajfnp5o5a9h2hrjkk9q3ac7/44977142625.pdf
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160938796a99c3---mebisaxuzo.pdf
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/d3f8ccdcdde993f1b3fb478a435889ea/xogajukajusi.pdf
    • https://digireg.at/upload/suboxudiru.pdf
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609c85c2162f6---64636996638.pdf
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1846b0e34---sijufajinuxaparona.pdf
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/c807f8bed0e214c72d34aa9e10cf52c5/21221057896.pdf
    • https://badrivishal.com/media/77809994268.pdf
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/e1c061579d6213b9ecc03efde2e8590e/nidakuxufezopuzufuponamo.pdf
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/4mml57n2m3bf9fccuf77va0e9c/gedowotitij.pdf
    • http://nuovartea.eu/userfiles/files/6379570360.pdf
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/tqgqmst88drkum2qe76srrj31c/19608906969.pdf
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16081d26b0a178---30873751892.pdf
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/16078042173c83---nasonufilesetakev.pdf
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f40a45e270---73923758166.pdf
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/271ba433d944b5541f6dd1e0cd24a5f9/weledesefalofidanetenuw.pdf
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d4836cc2284---61055986371.pdf
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608ea3f5456da---83172364781.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=day+by+the+pool+phoenicia
    • 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_off0000ed93.bin
be276cb858efb78b52d6256c9cadff935ef52e3bd12d308b9e77be825b7b6af0
pdf-font-stream PDF embedded font (sfnt) at offset 0xED93 10456 bytes
font_01_sfnt_off00010515.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10515 16792 bytes
font_02_sfnt_off00011d27.bin
44bd18f64c3bce59d697114c0af6adc96fbad56da6308ed1e53f34b163410943
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D27 16560 bytes