Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7d57991c392cf2b…

MALICIOUS

PDF

83.2 KB Created: 2021-09-18 15:29:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e3714e01798f4a49016b36072d13e176 SHA-1: 4367b3354ff6f7560f3a006bd45c0909df487301 SHA-256: d7d57991c392cf2b22dbc45504209e3fe5be4da45bf060c1202167fad02f0383
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, flagging it as a phishing trojan. The document functions as a link farm, containing numerous URLs pointing to compromised WordPress uploads and other potentially untrusted hosting. These links are likely intended to redirect the user to malicious content or further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/161325bf44ef09---sugebijoreragalu.pdf In PDF document text
    • https://webbsoil.com/home/webb/public_html/ckfinder/userfiles/files/37769312111.pdfIn PDF document text
    • https://elitstroycraft.ru/source/file/rilogazabezazaf.pdfIn PDF document text
    • http://diamant-x.sk/UserFiles/file/41152879072.pdfIn PDF document text
    • http://adec-interiors.net/Uploads/file/gunavitobifer.pdfIn PDF document text
    • https://mhreng.com/userfiles/file/71868542327.pdfIn PDF document text
    • http://studiocommercialedelpiano.it/userfiles/files/vifiwupuxavupiwesevebo.pdfIn PDF document text
    • http://gruppocinofilomarsalese.com/userfiles/files/jujexinexubofud.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/156908a98e5173389f38d196288c679c/komon.pdfIn PDF document text
    • http://studiotecnicoarduini.eu/userfiles/files/xegikipu.pdfIn PDF document text
    • http://goodfortune.hk/UpLoadFile/file///72488947256.pdfIn PDF document text
    • http://oawebserver.com/piceditor/file/50344574573.pdfIn PDF document text
    • http://itfkarnataka.com/cvsprojects/SSK/Source/2.0.0/images/files/260744274.pdfIn PDF document text
    • http://prplus4u.com/ckupload/files/mowibiba.pdfIn PDF document text
    • http://facilitymanagementassociates.com/survey/userfiles/files/97377533111.pdfIn PDF document text
    • http://luchetti.it/userfiles/files/jorugifivet.pdfIn PDF document text
    • http://boki.hu/editor_up/23431215273.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c5cda46464---pumukowanozorumipi.pdfIn PDF document text
    • http://resumesfromabove.com/userfiles/file/28152485924.pdfIn PDF document text
    • https://kominove-centrum.cz/media/files/file/14742944978.pdfIn PDF document text
    • https://mayxaydunghoangphuc.com/userfiles/files/risezanovomufetabemak.pdfIn PDF document text
    • http://perksys.com/userfiles/file/nulafovepolisonabane.pdfIn PDF document text
    • http://mijinmotor.com/fckeditor/userfiles/file/12550865881.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=what+is+the+best+video+player+for+androidPDF link annotation
    • 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0FC 17240 bytes
SHA-256: 335d68d440d2677a1fa18ceca7fd7ca1eaea5ed66673504fadd89fef548314f6
font_01_sfnt_off00010dbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DBE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000125d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125D5 10908 bytes
SHA-256: b5f9e4b07fb6f461b51202dcb0a70903cb473ac2d3bff8cb55b4080ff161fd45