Malicious PDF — malware analysis report

Static analysis result for SHA-256 e52041e26a195329…

MALICIOUS

PDF

72.3 KB Created: 2021-09-07 21:58:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a2b602f19c5def137cbb5281e22fe3ca SHA-1: d23a0e1fc602be8ebfae3b755f89a25dd786cd9e SHA-256: e52041e26a1953294848ba0d1da6c5db658037b47717cbd81c9cbaa3b3d86f6d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised websites or disposable hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are consistent with a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://inwebjor.ru/uplcv?utm_term=environmental+applications+of+semiconductor+photocatalysis+pdf PDF link annotation
    • https://www.la-melodie-des-saveurs.fr/ckfinder/userfiles/files/sutifugazepomarabo.pdfIn PDF document text
    • http://ettorebelfioreliutaio.it/userfiles/files/11727833198.pdfIn PDF document text
    • https://sjalikave.hu/pictures/file/66350321259.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/e332e520a5365b4de945eb9601d2d996/36896896661.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160840a18d6269---90393011323.pdfIn PDF document text
    • https://taxforce.nl/userfiles/files/baxazeb.pdfIn PDF document text
    • http://effektfilm.de/files/file/luzewafidoru.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/624507d76aa3238746a4fab777ca2f77/xolonikodopuzaxes.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/834568206d0b32e319b088d9d5327e35/xavozegawejodisobatasuwi.pdfIn PDF document text
    • http://munsusa.org/userfiles/file/20210708200736.pdfIn PDF document text
    • http://kosmonautika.ee/ckfinder/userfiles/files/29074780752.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/8r6d3qkl58tf0jdmuibo1is133/36572328592.pdfIn PDF document text
    • http://finproekt-msk.ru/userfiles/file/xaxedozew.pdfIn PDF document text
    • https://istocdukkan.com/userfiles/files/nuvanumeba.pdfIn PDF document text
    • http://xn--b1agjlwjc3g.xn--p1ai/ckfinder/userfiles/files/fodidoneriporibegumizura.pdfIn PDF document text
    • http://kimwendelldesign.com/ckfinder/userfiles/files/kavumuwuz.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/33861916399.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/d2bd82ea99c1882fac667cc0f02d7bcb/53503435440.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a3071819e16---wijedojomawixiwuv.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072c281b78d1---fidodojafoseg.pdfIn PDF document text
    • http://lesmashclub.com/imgUpload/files/31957390218.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/19691645923.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b4c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ccd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCD5 16912 bytes
SHA-256: 5030b4ef8804a3ae3ed76959124a91ee1ab9e02e8f6fa7aed18b4f68f3a12e22
font_02_sfnt_off0000f803.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF803 11148 bytes
SHA-256: 2e84c801cbc0d02a3bf0e0e3114872cb85bf18ef36a5066e1a3a9ce027451a0b

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