Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0f17b227363c990…

MALICIOUS

PDF

70.4 KB Created: 2021-09-25 21:24:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 76d4dd11c59463604d45ff8efd0886ea SHA-1: 2c0b48b3cf6e6a1330f92477df6567612960200e SHA-256: b0f17b227363c990e666c3d5599fbd39327faeee47deac08b6a4ad5d876a4e4d
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. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery through these links. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://philabc.ru/uplcv?utm_term=react+native+simulator+ios PDF link annotation
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/616292652d00254d8ef6bd2de8087bd7/8655833648.pdfIn PDF document text
    • https://slotpt2.com/contents/files/36003739767.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/2099164576.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/fuwibazagogikinada.pdfIn PDF document text
    • http://sbkf.org/files/files/19182358335.pdfIn PDF document text
    • https://dawnraytech.985.tw/data/file/userfiles/files/kugesuxiragetibakifin.pdfIn PDF document text
    • https://iqmuseum.mn/uploads/files/zedabojeleg.pdfIn PDF document text
    • http://kbidc.kr/upload/editor/file/1630989676.pdfIn PDF document text
    • https://lemarko.com/userfiles/file/50421979793.pdfIn PDF document text
    • http://archi-m.ru/userfiles/file/726847786.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/kunivamoj.pdfIn PDF document text
    • http://spc1991.com/ckfinder/userfiles/files/kipobegujesabi.pdfIn PDF document text
    • http://szermgrt.hu/uploads/ckfinder/userfiles/files/96459913831.pdfIn PDF document text
    • http://sheilahancock.net/blogfck/file/5165622381.pdfIn PDF document text
    • http://maremania.net/img_pagine/file/59638997164.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16143533ef2dd3---pelojuwufanugafufovotin.pdfIn PDF document text
    • https://vettercycles.ch/userfiles/files/87441410132.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/161368e458fb43---45989119754.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/161428b5e7df52---85000532044.pdfIn PDF document text
    • http://519pf.com/userfiles/files/kasujupitodajagufi.pdfIn PDF document text
    • https://textolinguisticsolutions.com/upload/editor/file/sidafixobezuwumitakutewet.pdfIn PDF document text
    • http://aci-immobilier-douai.fr/userfiles/files/21923733346.pdfIn PDF document text
    • http://kondicionery-lobnya.ru/upload_picture/file/fezuximizigenesasuwawejo.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16136bb18df72f---35381711282.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_off0000b24c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB24C 16356 bytes
SHA-256: c9c6c9eb88636bbaf02433c59cf51460b9168dc9f3e7a5952bda824330b9d26e
font_01_sfnt_off0000dc1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC1A 10604 bytes
SHA-256: 36e93f3e8b3bccea2d11999fce2a3308e49cd32d996c18198695bf1d4cbb7fd5
font_02_sfnt_off0000f45c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF45C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1