Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d175b3d4c553d6c…

MALICIOUS

PDF

74.1 KB Created: 2021-09-17 23:01:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ffbad7015d5405c55fe869fa9aa63d2e SHA-1: bd73d486587ecfa8bf0acdc0c4f97227b92feb32 SHA-256: 3d175b3d4c553d6cf1d2d001db2167c631149f02f93871999bfdc32acf17fa66
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. It contains numerous links pointing to compromised CMS upload storage and disposable hosting, suggesting a link farm designed to redirect users. The PDF structure and link farm behavior indicate a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

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 http://seoulsquare.com/userfiles/file/jowifudiberapakapew.pdf In PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/d9b8bqnqqjropp245og74lbr1e/goravusurepi.pdfIn PDF document text
    • https://confeccionesruiz.cl/UserFiles/File/toxobijopobenibadunoxof.pdfIn PDF document text
    • https://huaku3c.tw/uploads/files/202108312151341507.pdfIn PDF document text
    • http://kutscher-customs.de/gfx/userfiles/files/1446095811.pdfIn PDF document text
    • https://mimpiindah168.com/contents/files/20316863526.pdfIn PDF document text
    • https://rowanmkt.com/Uploads/ckfinder/userfiles/files/kuxolulajijobelof.pdfIn PDF document text
    • http://www.jasolasia.com/image/upload/File/pizotizulinatezixubera.pdfIn PDF document text
    • http://www.contal-farmer.com/uploads/files/kajebexafuwerifek.pdfIn PDF document text
    • https://bucatariizidite.ro/printuri-fi/files/xirabudukowixamaz.pdfIn PDF document text
    • https://www.truck-transport.com/ckfinder/userfiles/files/72510608785.pdfIn PDF document text
    • http://dogomanhnghia.com/uploads/files/87735489325.pdfIn PDF document text
    • https://deniz-sogutma.org/img/userfiles/file/36172709396.pdfIn PDF document text
    • https://marblo.marblobaths.ph/app/webroot/img/files/22264146205.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/71599599679.pdfIn PDF document text
    • https://powerliteaac.com/userfiles/file/wukesi.pdfIn PDF document text
    • https://rabudiagnostic.com/userfiles/files/butatujesomirux.pdfIn PDF document text
    • http://hondasushi.com/uploads/files/zulomedex.pdfIn PDF document text
    • https://zibarajabi.com/cache/fck_files/file/73882349924.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/d673b6bc44bddc642d1eb8cf5844e292/50919151727.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16141d24655fac---76243880871.pdfIn PDF document text
    • http://studioaba.net/userfiles/files/lokulobazuz.pdfIn PDF document text
    • http://fpole.ru/sadm_files/mijobuzozujipebubumo.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613e30c86adce---naxabidomo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=peliculas+gratis+inkaPDF 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_off0000be6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE6F 10476 bytes
SHA-256: 9b96a87ac4fc45e87c31674effcdd67df9c55901d0cb66a0158fcba6087e8f3a
font_01_sfnt_off0000d65b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD65B 17364 bytes
SHA-256: 45136ce0475a5d0a8185410bc34bad8662e7154499d6f830c9f576c0ece6a909
font_02_sfnt_off0001034d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1034D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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