Malicious PDF — malware analysis report

Static analysis result for SHA-256 76389e608f16047c…

MALICIOUS

PDF

80.1 KB Created: 2021-09-05 18:46:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a1c72329bd3a2e5a01d141e531d8df67 SHA-1: a5d5ebc771db6a22cabed0aafac6ea8e48c98a25 SHA-256: 76389e608f16047c574cca7abaa4fa8b1a87125de4434136ca3993e9fcd3043b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or SEO abuse. The document body is unreadable, but the heuristics and URLs point to a pattern of directing users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://archism.ru/uplcv?utm_term=2+dimensional+shapes+worksheets+5th+grade PDF link annotation
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/cf92d3dlfd101o5uamodr7jjo7/88751970386.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/8efd5628b5b0272db3cf71371640f794/rataduwogujik.pdfIn PDF document text
    • https://twinslock.com/ckfinder/userfiles/files/zofubenolonejosuvunikube.pdfIn PDF document text
    • https://cupanghitam.com/contents//files/suremudeweberezesaba.pdfIn PDF document text
    • https://hagepoorter.be/files/files/nixugejokigojonojovuvuzus.pdfIn PDF document text
    • http://svaz-podnikani.cz/files/file/nosadepunaf.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/b19e0f9e727d3376d87033197ba8de19/34993701822.pdfIn PDF document text
    • http://happyorderfood.com/uploads/files/loweligizotajunaxib.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160aca37ef1ad0---72793097962.pdfIn PDF document text
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/ad281e97da500c6d2c580d0ad53347f2/wedogobupun.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b1d5d96a6---27206973065.pdfIn PDF document text
    • http://xn----7sbakif2a3azdub.xn--p1ai/admin/ckfinder/userfiles/files/34163993668.pdfIn PDF document text
    • http://dcbestwings.com/uploads/files/xajefadenitilojirezuxiwup.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/sh0g2fq96v0di6ipdodddn9p3n/bozomafupotutimime.pdfIn PDF document text
    • http://peggylittlelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/12151363861.pdfIn PDF document text
    • http://samuiluxurytravel.com/Uploads/file/53418081992.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/95577391938.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608b5404a12d1---74954119934.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/k80r7b5q2g53516qmo8t62v21o/90306071088.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/61971dc2687c0e71186340be9eb10675/66769096630.pdfIn PDF document text
    • http://pantipplaza.com/userfiles/file/sudedu.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608c3cea87169---14098898696.pdfIn PDF document text
    • http://www.radanhorse.com/resource/files/23972264879.pdfIn PDF document text
    • http://world-housing.jp/ckfinder/userfiles/files/45925674220.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/16087356041f81---zexuwiziguvodofufadev.pdfIn PDF document text
    • http://minuspk.ru/minuspk.ru/userfiles/file/dikerev.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_off0000d269.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD269 18016 bytes
SHA-256: 3eea1300dc14303686ba561347ef48c123649299b2f3e91378d416daa3accc24
font_01_sfnt_off00010100.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10100 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011917.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11917 11176 bytes
SHA-256: 3c399141677102d228a378de58d06abcf2912404e69127e80bf08a8c4ae7a305

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