Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f6e5c8beefae6aa…

MALICIOUS

PDF

92.6 KB Created: 2021-09-05 06:18:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: fc7217735ff7b19e49dac09a2120661b SHA-1: 5c81c3c8b9a3c24303a613df88967b6f0f36f78a SHA-256: 7f6e5c8beefae6aa105e211aa9c945cacdd5b343e7aead7ea158178ae1317956
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to compromised WordPress sites utilizing the Formcraft plugin for file uploads. This structure suggests a link farm designed to redirect users to potentially malicious content, likely for phishing or malware distribution. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfa8adbe2b7---basexasa.pdf In PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161195f0d6e808---dametowulogumisuxuvoje.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609042f7c779c---1102106913.pdfIn PDF document text
    • http://dotacjedlaoze.pl/userfiles/file/rilanamulitajisa.pdfIn PDF document text
    • https://tolgyesvolgy.hu/userfiles/file/24454167721.pdfIn PDF document text
    • http://gibkrakow.pl/uploads/files/21764780583.pdfIn PDF document text
    • http://www.aluvascientific.com/UserFiles/file/tulisuxot.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/9993vcuj19g0q03gfrpce7lqmt/80638994028.pdfIn PDF document text
    • https://elpollopaulino.com/cenavarra_userfiles/files/mawurezufafijogixizuva.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/f2d3a3ju6r8p51ai7db8l4ufoo/50615503773.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/3537b06686a716db07fa5d2bc931792c/16198519251.pdfIn PDF document text
    • https://barcelona-health.com/files/galeria/files/ligalax.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160788432b13e0---fosasegivo.pdfIn PDF document text
    • https://santehsevast.ru/userfiles/files/podesidugo.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609ff7771df79---8248019252.pdfIn PDF document text
    • http://www.agenbenangbandung.net/file/50310239549.pdfIn PDF document text
    • http://zge-led.com/luodan/images/userfiles/file/63674803645.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c14fe7e3c70---29691182285.pdfIn PDF document text
    • http://buddhavehicle.com/userfiles/file/85082700562.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/92292487086.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b83a7628bbe---9062837496.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/075278565f9f2017c7fad21058c157c8/vijubofobodun.pdfIn PDF document text
    • http://beiwendq.com/userfiles/file/lodorotomatamipex.pdfIn PDF document text
    • http://tscyw.net/userfiles/file/20210615214933_itn34s.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=b%E1%BA%A3ng+gi%C3%A1+c%C3%A1p+cadivi+2019+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d94e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD94E 11128 bytes
SHA-256: bde1ce5124c36b5d499ff98507d3aad429bda6b5eb492f5c6d6f71984c0af92f
font_01_sfnt_off0000f279.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF279 33316 bytes
SHA-256: c4d11a06e3db89aa2626c9d9216b28f2233ff5089d2f977398cae1d249dfd696
font_02_sfnt_off00013202.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13202 16892 bytes
SHA-256: 7bb558c053dc4e043e6ec2b99395c9865f054a5c24d8cc6c1cc1224a35179b35
font_03_sfnt_off000149c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1