Malicious PDF — malware analysis report

Static analysis result for SHA-256 654026b247da1c2a…

MALICIOUS

PDF

75.6 KB Created: 2021-08-02 08:06:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4421d126217f09a055ed27368176b130 SHA-1: 56efa6bc18735fbf2a1d8f0f98b6f074b9a7bb5d SHA-256: 654026b247da1c2ad5cb679cc29d471efd95490773b9f7165f6ca432a70ee50a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external PDF files hosted on various domains, some of which are associated with compromised CMS uploads. This pattern suggests an attempt to distribute further malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://uralinteh.com/uploads/files/97834070512.pdf In PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a03b3d1d78f---tupurezazud.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/gikuwagib.pdfIn PDF document text
    • http://rasmesafar.net/basefile/basefiles/85964529547.pdfIn PDF document text
    • https://eminencesolutions.in/resources/userfiles/file/setifitanuxesekoxoto.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160901431326f6---pimawesozufepexolaxap.pdfIn PDF document text
    • http://saxons99.com/clients/5/5f/5faa49e4155ddd0d4faf97b0d7aa3dde/File/30677918732.pdfIn PDF document text
    • http://jingluo.net/uploadfiles/files/81119002588.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075c569992b0---kanawuvuwedujolog.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/8e68c5ef41dd9aefd05608aee561c9c6/temejitivifiziwet.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1607686c0b9354---7165880883.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16075a53f7d513---14242510591.pdfIn PDF document text
    • http://www.specemc.ru/upload/files/noxeratukegigakomelajewir.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607216523f991---33540814939.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cef4de1dc5e---18541958305.pdfIn PDF document text
    • https://museos.comarcadelasierradealbarracin.es/ckfinder/userfiles/files/xulokaj.pdfIn PDF document text
    • http://www.aamuhsv-madisonalumni.org/files/files/114686838.pdfIn PDF document text
    • http://rayanchem.com/d/files/22386973429.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6849d66f3b---dibakobepo.pdfIn PDF document text
    • http://hpworld.hu/data/pic/Image/file/92278361876.pdfIn PDF document text
    • http://hzbmsj.net/images/upload/File/gavaluxurimolididu.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/wuzenetode.pdfIn PDF document text
    • http://uctodane.cz/UserFiles/File/76848226381.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=primaria+quinto+grado+geografia+libro+de+texto.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c132.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC132 17980 bytes
SHA-256: c6a2edf78f10f661e80a8ecc0d2ce0d778102d784aa943f9a23422234ba45999
font_01_sfnt_off0000ef55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF55 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001076c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1076C 11228 bytes
SHA-256: acf12b448b84722131a9132124ca58c8e289f2485e08b094fca59ec7d7518428

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