Malicious PDF — malware analysis report

Static analysis result for SHA-256 a31ba50a176127fd…

MALICIOUS

PDF

85.1 KB Created: 2021-09-12 12:00:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0f67fe454a4624fa514314967b4aa16c SHA-1: db47fae746e4349076a880ac1698dbd77ac3d0fb SHA-256: a31ba50a176127fdb1e50e6642a2dfdb7cabd743b18b8241b7d62763dde1bc0e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The embedded JavaScript and numerous external URIs, many pointing to disposable hosting or compromised CMS uploads, suggest it functions as a link farm. These links likely lead to phishing sites or further malware downloads, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://inwebjor.ru/uplcv?utm_term=pokemon+storm+silver+rom+download PDF link annotation
    • https://sagarexpress.com/userfiles/file/fubibowilowide.pdfIn PDF document text
    • http://captainkillmite.com/uploads/files/202109090606432854.pdfIn PDF document text
    • https://bunian-co.com/other_files/File/66577783009.pdfIn PDF document text
    • http://stringquartet.biz/web/images/fck/file/kolegex.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fcda03abd9---dikutuvigubotobofip.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/18038768511.pdfIn PDF document text
    • https://webmedcentralplus.com/userfiles/file/golebodigoweti.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/7244819187.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/majetevusajawukekizavapek.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/sonozexukefeligep.pdfIn PDF document text
    • http://mtsp.by/userfiles/files/10428439392.pdfIn PDF document text
    • http://gold-carsales.com/js/upload/files/vasurunaxen.pdfIn PDF document text
    • http://eprdel.cz/userfiles/file/nerujobuvolubunegajonag.pdfIn PDF document text
    • https://aedwea.com/upload/foto/lozepugesudutadusewetuz.pdfIn PDF document text
    • https://myclubowners.travelenvogue.com/userfiles/files/zazetefixodemi.pdfIn PDF document text
    • https://luiginoiobbi.com/userfiles/file/redarew.pdfIn PDF document text
    • https://www.xyoaa.org/sites/default/files/files/45281135599.pdfIn PDF document text
    • http://zeminyerkaplama.com/upload/ckfinder/files/99910715737.pdfIn PDF document text
    • http://slesnick.net/userfiles/files/zawala.pdfIn PDF document text
    • https://caraudioshop.ro/mm/file/vegaxigijugebowe.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/f585ffa5f70864cd38f8e226a8884c7d/fazafakofawamuwol.pdfIn PDF document text
    • http://szyuangang.com/UserFiles/file///gitujurisuni.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/14328aa7c3cb8370f2397588edec0f85/ramov.pdfIn PDF document text
    • http://thermcom.cz/userfiles/file/32352739991.pdfIn PDF document text
    • http://flamefitnessstudio.com/cewit/images/file/74762062217.pdfIn PDF document text
    • http://topup-fight.com/ckfinder/userfiles/files/lebebikerorufuzikumavo.pdfIn PDF document text
    • https://mygoaltv.com/ipp/images/uploads/files/jupulubaxazo.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_off0000e3f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC08 10652 bytes
SHA-256: b784842c5db5d27f3b0ead06ec5b4d6c85a3ab8568e79226d8329d08575db252
font_02_sfnt_off00011478.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11478 19160 bytes
SHA-256: a1a75af3ea5f66f43272d0ec1d6b8498622de1a1062484c7d3b8115c0d953b31

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