Malicious PDF — malware analysis report

Static analysis result for SHA-256 785a54ef60b92218…

MALICIOUS

PDF

90.1 KB Created: 2021-06-20 08:54:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: f49cc123d92f16b765edb1e654177fd7 SHA-1: 4df6f1da83c5c90a37fb84fd4311bf0ddcedaf3f SHA-256: 785a54ef60b9221848be99d9c8bb5e326ef2d870db17b3f1957d990d462be00d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains a link farm pointing to numerous compromised websites and disposable hosting, likely intended to redirect users to phishing or malware download pages. The embedded URLs and the nature of the heuristics strongly suggest a phishing or credential harvesting campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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://coretry.ru/uplcv?utm_term=the+devil+and+miss+prym+pdf PDF link annotation
    • http://timnhanhonline.com/upload/files/xipuvekoxipimuten.pdfIn PDF document text
    • http://ketoanaca.com/uploads/image/files/66689160220.pdfIn PDF document text
    • http://cukierniabrzezinski.pl/www/artizam/fck/file/72110000672.pdfIn PDF document text
    • https://dakhoathienhoa.net/images/files/54049234556.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/c2ee9517b5020350621af473fcb144c2/golixusexetapupowaxo.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/2479147e9c830f7d5634098f2e67df40/xijonaxopi.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16074a380174b6---6226767179.pdfIn PDF document text
    • http://yngc.ru/admin/ckfinder/userfiles/files/41568744958.pdfIn PDF document text
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079b10a628f0---tosejelitarukakumu.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/1608d9e01216f8---56751989259.pdfIn PDF document text
    • http://highlandlynxotic.com/clients/7/73/73cf6ae24f8ea70eb1cbac1dff6b0f9e/File/fifutib.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098bf3a3ff91---virajawowikevagamim.pdfIn PDF document text
    • http://mazdooradda.com/userfiles/file/kuxawoma.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/b386df547e75da43c9ab12a5fa12e5d4/43297214273.pdfIn PDF document text
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/4dscfhg0mtlilcic5m5aeniseb/pomebilo.pdfIn PDF document text
    • http://businessdevelopmentcenter.pl/uploads/userfiles/files/31255967638.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0001342d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1342D 22560 bytes
SHA-256: da58c5062128daeb0d0d1b9353788d5c1bdd6a10def7c3cb1fd25ac2a6c3f289
font_00_sfnt_off0000f9d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D1 5392 bytes
SHA-256: e16d9f056c048eb624a161d350b746dfa0056c6ad131082cff50672fd68863d4
font_01_sfnt_off00010c08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C08 12824 bytes
SHA-256: 9fb299ba0da758f2f86f483bfff0d6215b5040685cbd044ad14ae90d95537fc2