Malicious PDF — malware analysis report

Static analysis result for SHA-256 f92377084172716c…

MALICIOUS

PDF

80.1 KB Created: 2021-09-10 23:10:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c7d29fe47a5ebd0dff173d84c6635c28 SHA-1: a9e64174b015fe21760bde0caaa885aa51186c05 SHA-256: f92377084172716ce4323246ce80d822d72b7f960aabaf58ec5ae72aaaf3b7b4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URLs, many of which are hosted on disposable domains or compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://medvor.ru/uplcv?utm_term=the+forever+purge+123movies PDF link annotation
    • http://4rrecycle.com/files/file/wikikazi.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139ad93d959f---35953194688.pdfIn PDF document text
    • https://zhongzing.com/uploads/files/202109041557234252.pdfIn PDF document text
    • http://geoplan.su/userfiles/file/58273751051.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/40615577925.pdfIn PDF document text
    • http://adriennemason.com/assets/files/wokatapazovikavogezas.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/6c0dc3847dfdc685d7c4bf993a963a80/22711985536.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/71370350639.pdfIn PDF document text
    • http://er-trans.com/img/produkty/files/tofebid.pdfIn PDF document text
    • https://theatresaucinema.fr/uploads/file/70453342762.pdfIn PDF document text
    • http://kovovyroba-nosniky.cz/UserFiles/File/jokaxutexokod.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/161340824a50cb---vuzakugebip.pdfIn PDF document text
    • http://thuocnam.xyz/images/files/56756033915.pdfIn PDF document text
    • https://shriayurvednagpur.org/public/ckfinder/userfiles/files/raxak.pdfIn PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-9-9/20210909013855858775.pdfIn PDF document text
    • http://pjteam.hu/uploads/xivoneb.pdfIn PDF document text
    • http://traslochimontalto.it/userfiles/files/80591400853.pdfIn PDF document text
    • https://suacuachuyennghiep.com/uploads/files/41980017351.pdfIn PDF document text
    • http://sanarina.de/ckfinder/userfiles/files/ragujadomawupubo.pdfIn PDF document text
    • http://nemochem.cn/upload/files/wawogemojafigarugiv.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/77122797382.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613b8cde2a380---67016682180.pdfIn PDF document text
    • http://clingac.com/d/files/wefase.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_off0000d332.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD332 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB44 17868 bytes
SHA-256: 6ab1fea763ba25cc5d512af52efae5a65574fbcba0a064e309820fdf1458f524
font_02_sfnt_off00011a16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A16 10868 bytes
SHA-256: cb1672ca059db62ee2792d410eb8c0a5fee72445bd45a5497f956ee03f14d6d7