Malicious PDF — malware analysis report

Static analysis result for SHA-256 17adf7f32920edcc…

MALICIOUS

PDF

71.6 KB Created: 2021-09-16 21:27:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 98e7b9f2aaa8d7a4bcd1b26e8e68458f SHA-1: 276f3b26afd7854535876d703f8246dfa8d4f9cf SHA-256: 17adf7f32920edcca45575a7dd004d7806ea404e4d2e865b2ff0c81251b6e190
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm, suggesting a phishing or malware distribution scheme. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • 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://ketchas.ru/uplcv?utm_term=download+stumble+guys PDF link annotation
    • http://mgtofubbq.com/uploads/files/lusonororifewu.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/58888131775.pdfIn PDF document text
    • http://canshu.dlzj.net/upload/files/20210914093004400794.pdfIn PDF document text
    • https://hssanesteban.cl/files/86661265813.pdfIn PDF document text
    • http://asclyziarskyklub.sk/userfiles/file/nusefut.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba28d873ed---simufadadezegizisasaxo.pdfIn PDF document text
    • http://stensoproject.com/userfiles/files/20569369316.pdfIn PDF document text
    • http://f-kcc.jp/user_data/userfiles/files/gamox.pdfIn PDF document text
    • http://shceping.com/upFile/photos/2021-9/file/puzojobixazeja.pdfIn PDF document text
    • http://kazuma.ru/ckfinder/userfiles/files/jasesi.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/161321a7c94b04---9623640496.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/d17004c4e2f025af4af42c0d99531be2/83732725108.pdfIn PDF document text
    • http://xhiehchin.com/Xhieh_News/_file/laroj.pdfIn PDF document text
    • http://twgo8.com/uploads/base/files/202109012326122554.pdfIn PDF document text
    • https://congthuonghotel.vn/app/webroot/files/images/pages/files/ragutexu.pdfIn PDF document text
    • http://sgrappresentanze.eu/userfiles/files/tetunanitob.pdfIn PDF document text
    • http://nieruchomosci-swidnica.pl/userfiles/file/tifiledarexewutokogowapav.pdfIn PDF document text
    • http://xsteelstock.com/d/files/rogadunu.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/161425cf5cde9d---76608848048.pdfIn PDF document text
    • http://zuche0551.com/upload/file/60894928166.pdfIn PDF document text
    • http://teakdeck.pl/files/file/padunonejotiluren.pdfIn PDF document text
    • https://www.aaptuk.org/ckfinder/userfiles/files/39267412058.pdfIn PDF document text
    • https://maxlinder.com/admin/assets/ckfinder/userfiles/files/98908588551.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/c1f7cb93d08603bca442e207c614debc/91853797389.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_off0000b7bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cfcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFCD 15820 bytes
SHA-256: c80f4f0d03c4f2174573e2935f4ae10447e1e7694dd7a40343b7ca9d3c361b84
font_02_sfnt_off0000f82f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF82F 10840 bytes
SHA-256: ebecc3bf3576a8c0a5621d227a210e747896f9189043c481698bdc936213c05f

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