Malicious PDF — malware analysis report

Static analysis result for SHA-256 d54babd694cd189b…

MALICIOUS

PDF

84.6 KB Created: 2021-09-10 00:20:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1f1c67f74ec01d9ecf035bd54b3dff17 SHA-1: ae48496ba6302cc1319a5e343a0d112b6ddbf596 SHA-256: d54babd694cd189bcea0d3412fbc0456ed970a96f9357ce642588ae37f417243
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS uploads. The embedded URLs and the nature of the heuristics strongly suggest this document is part of a phishing campaign or a malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://synerhu.ru/uplcv?utm_term=racing+in+car+unlimited+money PDF link annotation
    • http://meyanko.com/userfiles/file///laxavizajavuw.pdfIn PDF document text
    • https://12shio4.com/contents/files/bironusas.pdfIn PDF document text
    • http://nomayaku.com/userfiles/file/72156394157.pdfIn PDF document text
    • http://dailymaytrogiang.com/userfiles/files/39222882790.pdfIn PDF document text
    • http://yey.uw52.com/upload/files/9458437583.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16133ca05a48a9---jibevu.pdfIn PDF document text
    • http://terhautz.com/upload_files/files/60952154743.pdfIn PDF document text
    • https://tpk-m.ru/files/file/76028937400.pdfIn PDF document text
    • https://anjingliar2.com/contents/files/63367016890.pdfIn PDF document text
    • https://hbphoto.ca/resimler/files/roturorujopoxasabifovebox.pdfIn PDF document text
    • http://khunghinhdepphuctin.com/media/ftp/file/valolizomu.pdfIn PDF document text
    • http://www.arborvitae.cz/ckfinder/userfiles/files/29397664478.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133e554e2a67---bosesevibezezekegigup.pdfIn PDF document text
    • http://hotdeals24x7.com/ci/userfiles/files/49008105724.pdfIn PDF document text
    • http://nguyenthaotech.com/upload/files/11262156110.pdfIn PDF document text
    • http://vigova.vn/Images_upload/files/visiruwamokigitofulokux.pdfIn PDF document text
    • http://rungruangsteel.com/public/upload/userfiles/files/perupivet.pdfIn PDF document text
    • http://trungnguyenjsc.vn/uploads/image/files/limabegozorefuzepipaxetu.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16136f88d368c5---19407181940.pdfIn PDF document text
    • http://studiolegalezullo.eu/userfiles/files/5081370584.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/16130904732256---37190240518.pdfIn PDF document text
    • http://skolicka.eu/foto/images/file/6943703068.pdfIn PDF document text
    • http://menifee.hanasushichoice.com/uploads/files/nolegoposixajomod.pdfIn PDF document text
    • http://aweibel.com/Photo/file/59515211487.pdfIn PDF document text
    • http://orderkai.com/uploads/files/70668354438.pdfIn 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e624.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE624 10804 bytes
SHA-256: 4a798d93d6e10152e82bbca88a067f502a2a977a4a9d33b3967ddc4ccc6c6450
font_01_sfnt_off0000fedf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEDF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000116f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116F1 17564 bytes
SHA-256: 276f043ccc1b7c77cc8161cf521a0025a563b7c6668fa84d407107222dcfa050