Malicious PDF — malware analysis report

Static analysis result for SHA-256 420cb2b880199e7b…

MALICIOUS

PDF

73.4 KB Created: 2021-06-25 12:18:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0900eec4441ae7ccf78be9d34dd5aac9 SHA-1: 7cc6dd234ebebc673b5554b1540754d23d70b643 SHA-256: 420cb2b880199e7b92bdba286f6cf46ea92d0683484622fecdab669a3717ac26
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress sites utilizing the Formcraft plugin for file uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to external sites for further compromise or phishing. No scripts were extracted, and the document body was unreadable, but the link farm structure and heuristic firings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a771adab0d---jazalorufawaxu.pdf
    • https://emilline.dk/ckfinder/userfiles/files/suzovikazififebosinu.pdf
    • http://agiteam.org/clients/b/b0/b0c4817036ef1cb73596cc935f3fa86d/File/sujemaforutuvimezarumo.pdf
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16076fd65bd54a---65701665892.pdf
    • https://menu2uplus.com/images/file/76843317219.pdf
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b259c483340---tidakekitojebazagode.pdf
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16078a31a96347---buvitadek.pdf
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/kmcd0jnj0v3djb8khvkup4bg95/pubirapovaro.pdf
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/2b3ad1bcd5cc62d3e45726b752617689/duvatitarel.pdf
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/uutk2tka6vu7ueluvq1g8pftfm/91698336632.pdf
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160905d5917660---76888622106.pdf
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160734d51ccf92---nubuxuf.pdf
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/a7l7b4dc09o9fr0fsdk2526r6s/mogezukamewupuratatajewop.pdf
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160821a2389878---36905737958.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=enterprise+1+grammar+book+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_off0000b752.bin
a8ac02f9dc259cc4ea4b28dd65529381644ec60f14802e71b0abfc42df3571bf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB752 11060 bytes
font_01_sfnt_off0000d0b5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD0B5 16792 bytes
font_02_sfnt_off0000e8c7.bin
b66be36a0df593f2d5ae83a0ae0146488b295ad21fa5c24533e9cf0f5cdeb742		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C7 19232 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.