Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7a95e95c852270a…

MALICIOUS

PDF

69.5 KB Created: 2021-09-14 12:35:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c7a8c750c1e5dc01123bdbb1cbd2ab76 SHA-1: dea0a1ffb2b801fab0ccce2a6ce07732c2daf570 SHA-256: e7a95e95c852270a6f73c1ac4644d1b3e522c28ca80de24c44289d43ae2e58d6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://synerhu.ru/uplcv?utm_term=hunter+x+hunter+chimera+ant+arc+ending PDF link annotation
    • https://kit-veron.my/ckfinder/userfiles/files/xofubakalefepifuvamawis.pdfIn PDF document text
    • http://chono.mn/uploads/userfiles/files/90958303159.pdfIn PDF document text
    • https://majubesar.com/contents/files/50827078628.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/67ki7jfahmpr4e8nk5ei0ijdie/xizobufere.pdfIn PDF document text
    • http://mlight.cz/archiv/file/bizufapurejekas.pdfIn PDF document text
    • https://netron.pt/app/webroot/media/files/73228712188.pdfIn PDF document text
    • http://ylplj.com/ckfinder/userfiles/files/pexudijejafalodoz.pdfIn PDF document text
    • http://espaciocultivarte.com/ckfinder/userfiles/files/64746232842.pdfIn PDF document text
    • https://jmtours.co/aym_image/files/jixewimogiluronu.pdfIn PDF document text
    • http://colegiosantarosa.com/uploads/imagem/file/79467275866.pdfIn PDF document text
    • https://makenie.com/upload/files/34880831274.pdfIn PDF document text
    • http://forglory.cz/ckfinder/userfiles/files/83127739001.pdfIn PDF document text
    • http://food-cloud.com/home/food-cloud/www/site/site/data/files/18367361216.pdfIn PDF document text
    • http://thegioixedap.net/upload/files/tipigenirugekutom.pdfIn PDF document text
    • http://chinazzjx.com/d/files/kodixigepawanebada.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/c3f65bf433083322ec0cd9a2832ce7a1/nawuti.pdfIn PDF document text
    • http://nhakhoauytinhaiphong.com/upload/files/67822388529.pdfIn PDF document text
    • http://iltorg.ru/upload/file/kugokuwizaguvalanaromewef.pdfIn PDF document text
    • https://mayphotocopydogia.com/upload/files/65974162283.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/86tp6hqggdkp7k3sjisdulle9p/zizidizeredaxugigebudat.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613c5e781f8b0---22077297271.pdfIn PDF document text
    • https://subded.org/userfiles/file/mareginovejufogi.pdfIn PDF document text
    • https://negaratoto.com/contents/files/49333513834.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_off0000b261.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB261 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA78 10676 bytes
SHA-256: 773de1350d9d2d6293eeb093cf718f23b930047b30783dce647981dc17a95e97
font_02_sfnt_off0000e27a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE27A 15036 bytes
SHA-256: 86eccc0898377f7bc354f71edf10a05a53296fb515d170540cb5b1da803b1c9a