Malicious PDF — malware analysis report

Static analysis result for SHA-256 7797209383178a09…

MALICIOUS

PDF

86.6 KB Created: 2021-09-14 09:17:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: eef4744e327c292e5ad66a8bb02f9520 SHA-1: efd05b1caad133dd54575ded0ce820f4b3649a35 SHA-256: 7797209383178a09b23845265a58c23abefb3c74ea50674966f824283145beed
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML and ClamAV as malicious, with heuristics indicating embedded JavaScript and a link farm pointing to potentially compromised CMS uploads. The embedded JavaScript likely attempts to download and execute a second-stage payload, while the link farm serves to obscure the ultimate destination. The presence of these elements strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 http://devison-matras.ru/upload/file/xizaxifobisivuli.pdf In PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd5dde7899---88095785779.pdfIn PDF document text
    • http://dissanna.com/temp/fckeditor/file/95283605531.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16134d60d79483---lojiw.pdfIn PDF document text
    • http://regalmotors-jp.com/js/upload/files/73685975227.pdfIn PDF document text
    • http://pes.edu.mn/ckfinder/userfiles/files/fizikunateger.pdfIn PDF document text
    • http://kraemer-duennebacke.de/files/file/magaxe.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/2476964861.pdfIn PDF document text
    • http://traktorpulling.de/ablage/userfiles/files/sedakofefibakezemuruma.pdfIn PDF document text
    • http://conditum.nl/userfiles/file/19180756535.pdfIn PDF document text
    • https://transilvaniafishing.ro/app/webroot/files/userfiles/files/47414049700.pdfIn PDF document text
    • http://bienbao.org/uploads/files/wafigeziwuvixuforuj.pdfIn PDF document text
    • http://96stone.ru/userfiles/file/notanapavumotevuteteb.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/d85ed5e6c7dce63fc4298971fdf3cdc7/77910197117.pdfIn PDF document text
    • http://arablift.net/userfiles/file/tijatevijiserojuros.pdfIn PDF document text
    • https://liepasmuiza.lv/userfiles/library/zabuwexiv.pdfIn PDF document text
    • http://theonejsc.com/userfiles/file/17495191158.pdfIn PDF document text
    • http://kubabus.cz/novy-web/upload/file/4687997298.pdfIn PDF document text
    • https://parc-hotel.info/file/6466138097.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/cictc8p30k3q1eacou0qvaoij6/13436135078.pdfIn PDF document text
    • http://sage-chem.com/image/files/20210909_010024.pdfIn PDF document text
    • http://svenskafik.se/uploads/fckeditor/file/kevonikawatipasuwejelat.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/dmq3ms32r8g24n8mn1tqnpbau5/75861957615.pdfIn PDF document text
    • http://lg-palette.com/upload/files/rabugenefunatogu.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/16138271d3cbe1---32228558680.pdfIn PDF document text
    • http://tentauto23.ru/ckfinder/userfiles/files/64354157195.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=pokemon+x+version+gbaPDF 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_off0000e281.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE281 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA98 10708 bytes
SHA-256: cb28e87d68bc36600f3157910d0701d4416d47d5f2f6dab9f55186a254527a76
font_02_sfnt_off00011339.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11339 21400 bytes
SHA-256: 52e1595bf1aa27ee8978d29b1437479b7bc34a78ea482b4fd936842b458cc7f7