Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e42ca6ff2c0eca4…

MALICIOUS

PDF

76.9 KB Created: 2021-09-03 18:56:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2d56db7c0ffa8f7b41b5ab4f78e04c45 SHA-1: e9e94035a2f31156c5762fa68724145482addfc1 SHA-256: 8e42ca6ff2c0eca418bcd05bad29a470aefdc72a372adac6a39e66d2a5b2dc08
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress upload directories and other disposable hosting. This structure strongly suggests a link farm designed to redirect users to malicious content, likely phishing or malware distribution sites. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f60171f252---funumefegawazumek.pdf In PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083973fe8f2a---rixidujuvufakuxawojosev.pdfIn PDF document text
    • http://intelekt.biz/uploads/pages/files/98881776124.pdfIn PDF document text
    • http://csc025.com/userfiles/file/20210819201217_05nphx.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acd4d905de3---wegod.pdfIn PDF document text
    • http://styropapex.pl/userfiles/file/makadudiz.pdfIn PDF document text
    • http://appli-veolia.net/ckfinder/userfiles/files/10187350372.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609c63d55c7c1---jaxavikedojug.pdfIn PDF document text
    • http://balogmihaly.hu/UserFiles/file/17741904930.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160775c1108ea5---zopigidagakimegomewa.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/7j1vppqfoqb82rs0ldkd656p39/34677162740.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160db6ede9df9e---bezivewoxuvowutizodera.pdfIn PDF document text
    • http://trekkingsapatours.com/upload/files/luviwezegez.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/90624644759.pdfIn PDF document text
    • http://iwort.de/userfiles/file/12496144374.pdfIn PDF document text
    • http://cestovni-postylka.eu/userfiles/file/kalupetotebarezimo.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/9mvvogu4m43g04diild769s3vl/60773504873.pdfIn PDF document text
    • http://mrybalko.ru/files/82198993109.pdfIn PDF document text
    • http://adirondackseafood.com/ckfinder/userfiles/files/finan.pdfIn PDF document text
    • http://chiangmaicharmingtravel.com/ckfinder/userfiles/files/59614107267.pdfIn PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/buduxasubabupiradogufalug.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608562c46c2c1---43842687437.pdfIn PDF document text
    • https://confetti-seasons.ru/upload/files/84363662935.pdfIn PDF document text
    • http://optikametuje.cz/userfiles/file/xebopetizinugirajimorola.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=1st+order+low+pass+butterworth+filter+pdfPDF 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_off0000c62e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC62E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000de40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE40 17952 bytes
SHA-256: 5072e9025713c36b4c55825d83d6d928fac69e30aa572ddf2eda0e13a20ca8e6
font_02_sfnt_off00010cfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CFC 10772 bytes
SHA-256: 208bad07eda691816953495bd800333f14b35fbff98b5d897652ef80854c9ae1

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