Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8f9b268f100a2df…

MALICIOUS

PDF

82.9 KB Created: 2021-08-27 12:54:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 84732c8f33d4cfaf3e1988032fe5c98d SHA-1: 42cedcceb469455adecf671bd7414a12c6534123 SHA-256: d8f9b268f100a2dfb348c55424b827e3c79170a0e3d0a6c1be3c361f0e010870
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users. The ML classifier strongly indicates maliciousness. While no scripts were explicitly extracted, the presence of numerous external links and a 'download button' heuristic implies an attempt to trick the user into navigating to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 7

  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://nomylo.ru/uplcv?utm_term=love+does+chapter+summaries
    • http://sotel-perm.ru/site/file/50175475795.pdf
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/agg6hahflrjvf8s4590c71nkv3/43533267136.pdf
    • http://mtecommerce.it/public/news/file/92260915687.pdf
    • http://circuitoinsulargc.com/documentos/file/domovofigex.pdf
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca81b6c8ee---nazetivodisejesub.pdf
    • http://longearedhounds.com/clients/65743/File/44298468761.pdf
    • http://minuspk.ru/minuspk.ru/userfiles/file/87613834907.pdf
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160ec41fcefb37---neruvadanojivavixevane.pdf
    • http://harmonie-avion.fr/actualite/files/kuxumexukajatirenamif.pdf
    • http://cngwalk.com/fckeditor/userfiles/image/xomikenumawi.pdf
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/rk97ehvfkqmplpec7qe6f9ft85/gokewixixipofotupupikipow.pdf
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/484035621535ad983a6ec69b877e9b42/bagopaxofetulomekuwa.pdf
    • https://www.carrentchiengmai.com/files/47006041554.pdf
    • http://web5gstore.com/Files/files/rogemejonujunitubipafajob.pdf
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/7dca374b472de9a438fbe278b3442e6d/37835228925.pdf
    • http://djarkitek.com/temp/vinney/HTML/userfiles/file/rirejofasok.pdf
    • http://hkacca.com/userfiles/31734076469.pdf
    • http://armanetti.com/images/revisu.pdf
    • https://campermagazine.tv/public/file/35604042586.pdf
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/d7f40cbb857d102482b5ed5068987318/rufebiguwu.pdf
    • http://dalnoboy.org/data/filestorage/upload/files/fufodasirituregex.pdf
    • http://127.0.0.1/kardelenemlak/upload/files/gositum.pdf
    • http://travelport.pl/userfiles//file/96524974592.pdf
    • http://eau-msu.ru/ckfinder/userfiles/files/xibedaruweganarebexobe.pdf
    • http://cke.hk/userfiles/96342739455.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_off0000e224.bin
36886cc31d9322042356e622ab2fcef6e7b0ff0fbb0172b1d47853f598d77ce0
pdf-font-stream PDF embedded font (sfnt) at offset 0xE224 16424 bytes
font_01_sfnt_off00010c83.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C83 16792 bytes
font_02_sfnt_off0001249a.bin
70af3817a6e3b175906b591beafeba63ad43d9fc2d8a57371f301f8015da2593
pdf-font-stream PDF embedded font (sfnt) at offset 0x1249A 10752 bytes