Malicious PDF — malware analysis report

Static analysis result for SHA-256 b56680bb3d0a4eda…

MALICIOUS

PDF

79.9 KB Created: 2021-08-11 20:44:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1a949e703ac507fedf78bb90364eb6d0 SHA-1: c46c81b6b2803536753773f315a78953fc971450 SHA-256: b56680bb3d0a4eda4a347986366d301ab59fa0008aabc063e8ce8db7b60c984c
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload directories or are part of a link farm. The presence of a 'Password-protected archive lure' heuristic suggests the document is designed to trick users into providing passwords or downloading password-protected archives, which often contain malware. ClamAV also detected this file as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://cructi.ru/uplcv?utm_term=falling+up+by+shel+silverstein+pdf
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/16108925be6d37---vakajitavafoxokikumoferi.pdf
    • http://xn--b1akwe.xn--p1ai/userfiles/file/86029195020.pdf
    • http://agcslohian.com/userfiles/file/jolijedoxidesosewotizawon.pdf
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/2ef4d85ff3f1d3f458abf8e6dd54f54d/vuwun.pdf
    • https://www.travelknowhowscotland.co.uk/assets/js/ckfinder/userfiles/files/27788236530.pdf
    • http://fermobkorea.com/userfiles/file/20210801145842.pdf
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/83fpjtf6m0jubjcpcirpts407b/pegunefemivegux.pdf
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606da187d8925---wedavelibavusozag.pdf
    • http://tdbakademi.org/userfiles/files/rowasekatavot.pdf
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3fc9be5994---78378451736.pdf
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160807ce497376---misegonunev.pdf
    • https://cosplay-expo.it/ckfinder/userfiles/files/topubav.pdf
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/7384f98b9dc0407172d26e159d178e00/58475913456.pdf
    • http://zimaletto.com/uploads/file/75376009111.pdf
    • http://cukierniabrzezinski.pl/www/artizam/fck/file/16689980818.pdf
    • https://afra24.com/basefile/afra24/files/xidevasuret.pdf
    • http://thesecurityguardunion.ca/userfiles/files/gujedadujipo.pdf
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609d200e38e43---3308928555.pdf
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/529f2593a989a7295fa356df5521bb72/2544353226.pdf
    • http://www.multigacos.com/admin/uploaded/fck/file/dosafixifevegazafemovuse.pdf
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d707638ed70---kapinikezigupigan.pdf
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/b22471abb139688fec128e1892d0c321/lulonegugofi.pdf
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/f3f4088a2fdd62ad5ee32d6a1e02b0cc/96028045443.pdf
    • https://www.naabelectric.com/userfiles/files/jiwonumomufexoxibebonu.pdf
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/kjv9tbtlf08eg45jpqhhi03rjg/kexukemeduxutisanipemox.pdf
    • http://nationalcoopadvisors.com/userfiles/files/zasekesulufagapij.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_off0000d2aa.bin
5665c698ba4dd89ef1418f274130449e1b9bc4683e74daa32163615d12e54b53
pdf-font-stream PDF embedded font (sfnt) at offset 0xD2AA 17008 bytes
font_01_sfnt_off0000fdfb.bin
69cfed73e06f0d34514e89b8aced34f97dbbf1f4750169592dfcb4712bc972a4
pdf-font-stream PDF embedded font (sfnt) at offset 0xFDFB 11056 bytes
font_02_sfnt_off0001173c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1173C 16792 bytes