Malicious PDF — malware analysis report

Static analysis result for SHA-256 de9e8b843f3010f0…

MALICIOUS

PDF

89.1 KB Created: 2021-07-13 21:43:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d433ce7eff411844f0c23e6e3a39a2de SHA-1: 7670939d17c6d6669cc70fb34ffac179a511b960 SHA-256: de9e8b843f3010f0755a8c48511e8ad2dd2b90aafe4767965e1463f4240f08e8
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm to distribute malicious content or conduct phishing. The presence of embedded URLs and the 'link farm' heuristics indicate a deliberate attempt to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://cructi.ru/uplcv?utm_term=the+power+of+now+bangla+pdf+book+download
    • http://abwcoliseum.com/uploads/files/22618846726.pdf
    • https://unosms.us/userfiles/file/2414848451.pdf
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609f6ad9b90a7---89110896324.pdf
    • http://atthaya.com/file_media/file_image/file/kakukepemuzalik.pdf
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/pbbf3kb3fj24clal0egskqfbcr/xajopujitevufirolabetugo.pdf
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/pqugsmuqu06h07kqhaj5dc3ad2/sezimuturafamonugu.pdf
    • http://indyztyle.com/ckfinder/userfiles/files/62295402877.pdf
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad128ab070f---lorakojogiju.pdf
    • http://scheiden-maassluis.nl/uploads//file/getunuxuxekixumuteki.pdf
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608309874f2e2---18742476541.pdf
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/o0ph22dv01j94i5o5sv82k0c24/buvuximoronasurogoja.pdf
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/5be5085efcc3d6326cb899f8e93486fb/kisuremumividegapukepujoz.pdf
    • https://noblacklist.pro/web/img/podborky/files/xesejivugumetapabufofo.pdf
    • http://gvs-russia.ru/admin/ckfinder/userfiles/files/newumixinelu.pdf
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16095fba02f7d5---pavagitujubavidebugifakas.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607951ca7c819---tikizopupigunotid.pdf
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/s5rn11ktlnqbv0g5lv3tirbpu1/tarubudi.pdf
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b64b67e8096---vogegorojejiw.pdf
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/hv9n3pnp6epi3vm717vffe7kk7/34539700238.pdf
    • https://sonarmusic.hu/up_image/file/tapaxizexipu.pdf
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/e2972236cc724e1b2f82021ac2b94a76/pexekizuganujivepar.pdf
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16093d7885e607---13427480978.pdf
    • http://jlm-kg.com/uploads/file/37745761855.pdf
    • http://liavanhaeringen.nl/userfiles/files/purotamevetikunava.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_off0000f69d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF69D 16792 bytes
font_01_sfnt_off00010eb4.bin
661e5da6720f3746ad9be612ba2ec021ca5e5e9d0c61c803a7ed5dd100e42b4b
pdf-font-stream PDF embedded font (sfnt) at offset 0x10EB4 10700 bytes
font_02_sfnt_off000126cb.bin
2e53df12b8e8c2eae9469fe142bc287387072580ba85b9acb8058072afbfdcca
pdf-font-stream PDF embedded font (sfnt) at offset 0x126CB 18352 bytes