Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ea463e65af586a0…

MALICIOUS

PDF

83.6 KB Created: 2021-08-15 02:43:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 336d0b959552f87c5b3320faf0bfa405 SHA-1: dfb602bd0ceff249febdb58ad59cbda259efaee5 SHA-256: 2ea463e65af586a0f4efe4d58f800c61f7561a67ebeda1f30c943ebadd64e70b
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple domains, several of which are hosted on compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL analysis suggest the PDF's purpose is to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/8dbb7a031c80b0f2319572a14b54b8b9/52340478149.pdf
    • http://tw-go.org/files/vajufawifakisikisir.pdf
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160aa56d011409---48897554449.pdf
    • https://www.libyamonitor.com/sites/all/libraries/ckfinder/userfiles/files/90904020914.pdf
    • http://nature-revive.org/files/file/fezapovolorex.pdf
    • http://teranor.com/ckfinder/userfiles/files/zopadokotifeso.pdf
    • http://csim.jp/ckeditor/uploads/files/vanutetixe.pdf
    • http://www.oneworldkarate.com/fckeditorimages/userfiles/file/bowibupaxisivoramaratopa.pdf
    • http://sanfrancescovet.com/userfiles/files/gakakuxuzirusogufimofal.pdf
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/bf2c66d84ec40c9f17f1054576e08d18/wakobigavojato.pdf
    • http://cs-golfclub.com/ckupload/files/lajowig.pdf
    • https://magnificenttreks.com/userfiles/file/46293272355.pdf
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/d92475b0e17eaf6642a16116ef707a04/67041836037.pdf
    • http://spain-ex.com/images/blog//file/78676600218.pdf
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160963e3331894---7008805649.pdf
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/a690700d07e52e0630e8c32f2406a9de/pagokamariwez.pdf
    • http://plncse.hu/php_data/file/49329222617.pdf
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/16072123b10429---79447722609.pdf
    • http://technology-mp.it/userfiles/files/vilub.pdf
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b498640d498---24313112200.pdf
    • https://aplusadvance.com/naver_editor/data/file/lulurerikis.pdf
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0e71d443ab---54246654823.pdf
    • http://erbamedica.org/userfiles/files/47014177089.pdf
    • https://ietc-oman.com/userfiles/files/33992477385.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=2007+arctic+cat+650+h1+owners+manual
    • 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_off0000e109.bin
099c0f31d130284e21ea5bdc6bdbf45e2a3911d79953c0b6c736d42f94500153
pdf-font-stream PDF embedded font (sfnt) at offset 0xE109 11232 bytes
font_01_sfnt_off0000fb7d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB7D 16792 bytes
font_02_sfnt_off0001138f.bin
1121574734a090f9496142787a338d55c880699bfe16e420b62bafad9192aca8
pdf-font-stream PDF embedded font (sfnt) at offset 0x1138F 17244 bytes