Malicious PDF — malware analysis report

Static analysis result for SHA-256 8670b951151fac27…

MALICIOUS

PDF

55.7 KB Created: 2021-06-01 15:11:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 99c73c6b747201b83eb3045516e97097 SHA-1: c2ee33bdfb163fce8816bbfd8c927d32ab6fd356 SHA-256: 8670b951151fac278d77ebcd1b661f70abda1bc116d33e6765412016f3e38e6e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to compromised WordPress sites, likely intended to distribute a modded application. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates the PDF itself is a link farm on disposable hosting, further supporting a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9677

Heuristics 5

  • 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
  • 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://coretry.ru/uplcv?utm_term=galaxy+space+shooting+mod+apk PDF link annotation
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/n0s3b5s0cmhhltv1jeedks6nd6/vazebuna.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3c489afe3---bapomo.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/16078e7163914a---99233082333.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/804ab49b4d840ba72b09ead08a7b1ea4/lalogebimofuzulireb.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/3a787273e674799de49eb8e8f2a743cf/33231767365.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606e32751d464---48224702245.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/ng7dl6g7h7hm5tbmfpl1nfe753/37905530213.pdfIn PDF document text
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/b64e093cd30cfefc824526cf6ee36e3e/87693075357.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/28ba3bfa5517a35fa34c2b07ebf00476/15802734188.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/c00fd049f58d617536cdfc21afdc88d0/24422783091.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/6bdf0f0002daf4ae2fb86a858d60a5b7/zufuve.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/7f4e12927734ac6268ac7fdaf002f50a/garozugoxujoseporufotix.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160883a0a46967---23531536027.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/s7f2g9tbtqg0ibdl1st17m10ke/zamasutifamokemabivaxete.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/457eru0us06qjq8isp4eqpm4sc/xafuxa.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d2d08a8a3a---tikibutezefa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cddc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDDC 5656 bytes
SHA-256: c522868c6cc928c82be1dc343b28e956ed05e585f96fa5078057e0a56562bce1

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