Malicious PDF — malware analysis report

Static analysis result for SHA-256 92e11474f68cac27…

MALICIOUS

PDF

82.6 KB Created: 2021-09-06 15:25:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 134297c1033614e43ad26f99c43f0461 SHA-1: a53de57609fff5d3529f055632a0395301ec47c6 SHA-256: 92e11474f68cac27ae39bcfe9a67e2bb90f7065ab4808db5c53896926852ff3e
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL analysis point to a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://baaningdoi.com/file_media/file_image/file/merumizivozupazebixabi.pdf In PDF document text
    • http://modero.vn/upload/files/75165377992.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/finaketazixubi.pdfIn PDF document text
    • https://masukpt2.com/contents/files/277219169.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc428e24a3---5042220237.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/sopaxepara.pdfIn PDF document text
    • http://floramarble.com/uploads/mixusenopavibidam.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a5d62eb179f---7827140606.pdfIn PDF document text
    • https://alarrabnews.com/images/content/content/file/xurupetafatebed.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/v99r06n4fph6jtk27g6gri8fn6/3600869553.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb5da0be9cd---8319954009.pdfIn PDF document text
    • http://studiovalecchi.it/userfiles/files/rexumabix.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-7-26/20210726074112733064.pdfIn PDF document text
    • http://studiotecnicoprato.eu/userfiles/files/23308725527.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///retisowunomizen.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/4fed6c34d1a4bdc09d8898e74896d084/nenubiwamiboxud.pdfIn PDF document text
    • https://dotcomtravelegypt.com/userfiles/files/92709330589.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b8572dac903---19553957921.pdfIn PDF document text
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/c9spm9q3uk73juaevbhj94qjm7/wofamopik.pdfIn PDF document text
    • http://lpc2529.com/piceditor/file/wigut.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/e4b56b2caf770f6a439115d0df6f57a8/55072972347.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/5497d8d50c39178e295744cf3dd8d68c/22755910879.pdfIn PDF document text
    • http://fli.edu.mn/ckfinder/userfiles/files/9056236427.pdfIn PDF document text
    • http://winfielddeli.com/ckfinder/userfiles/files/dexomarum.pdfIn PDF document text
    • http://donateagift.eu/userfiles/file/42189807222.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=calendario+2021+pdf+gratisPDF 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_off0000dcc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC3 10996 bytes
SHA-256: 3950c82378bc5227d3a36f0adf27f73c2a4805016931cb91720833795fcfdb3f
font_01_sfnt_off0000f646.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF646 18232 bytes
SHA-256: dda3a1e60e14b650461a7d81877c8c3abac11e8ae4c692bf888c81f2eec64793
font_02_sfnt_off000124b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1