Malicious PDF — malware analysis report

Static analysis result for SHA-256 777bcb8ec20ca6f9…

MALICIOUS

PDF

83.3 KB Created: 2021-06-27 10:19:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1947d2979f38f6ff8073711e0eb7e904 SHA-1: de82d29347aabfcea120068d683de2123a5b01a9 SHA-256: 777bcb8ec20ca6f9a04d7707581be6a34890c1c7073a01ce262fff86120321af
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress sites. The presence of a link farm on disposable hosting suggests an attempt to redirect users to malicious or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607aef64ee7cc---18536422616.pdf
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/450bdd7ead6cae6845551b71857e14ce/xegeta.pdf
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/894f4239c515b864e196b3c13cdaf2a3/vepikuxu.pdf
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2c4a08f47---novikorapigokob.pdf
    • http://webdulich.com/js/ckfinder/userfiles/files/kuzomifoti.pdf
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a1856c503fc---powagotabinor.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/4njdqs6c60pjjtp45c8tlb7bt0/58699453544.pdf
    • https://ukdirectremovals.com/wp-content/plugins/super-forms/uploads/php/files/74c8fc61dcbaae4ea60d298847729256/90427691856.pdf
    • http://www.gesas.it/media/mailinglist/file/pupizuwafediwajifeki.pdf
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/9711c355286f9cf0f036f72cefa5f45f/julavelokarugoradij.pdf
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/pn62mtpd9i5358knujr641dc09/sisuxajazejijeman.pdf
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7743f57942---xezotazewo.pdf
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e492b69d90998d705399abf2d1b5b367/rolovok.pdf
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b3b368bdab0---jeditevajereb.pdf
    • https://capitalsyndic.com/userfiles/file/53037673416.pdf
    • http://jjinline.org/file_upload/file/xisisifilik.pdf
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/12b0eebeab67890b2a3fcef94ce27e79/dogufofeboxoxudul.pdf
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/2gbfa7r3ijfjrhu8arhvk22m61/83400131747.pdf
    • http://kolasinprevoz.rs/slike/files/91406721314.pdf
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/2befh9qr2nqc1vj8u51ftpieu8/22759275245.pdf
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/cbd8e7d161697b188f3bc50494494a0d/57298667508.pdf
    • http://kaupa.cz/userfiles/file/daluwububoxutu.pdf
    • http://yilip.net/userData/board/file/30463815873.pdf
    • http://jhdjt.com/images/upload/File/84273173883.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=lcm+of+48+and+72
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ccbf.bin
c099a6d28883d9ae41d5bdf4550fda4e85ea812554d6699b5104d60590169ce0
pdf-font-stream PDF embedded font (sfnt) at offset 0xCCBF 16848 bytes
font_01_sfnt_off0000f8a9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A9 16792 bytes
font_02_sfnt_off000110ba.bin
bfc7ce51a1a9b37382af61f0075eb0cdb972126da031002d338643432d80e6e4
pdf-font-stream PDF embedded font (sfnt) at offset 0x110BA 16252 bytes
font_03_sfnt_off0001269b.bin
3e68bffa1ca506176ff8b8862802ce773752d25b0c0c028bb156a70bd6ae14e9
pdf-font-stream PDF embedded font (sfnt) at offset 0x1269B 10416 bytes