Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf3d36472bfaf979…

MALICIOUS

PDF

76.4 KB Created: 2021-09-20 21:05:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2e4e7f2bfc3d220fea7851a0d6c2c6e6 SHA-1: bfebf3762956d19ee2183f83c5d839003dea4c5e SHA-256: cf3d36472bfaf979e184072a5d1ead9814bcf32147e8f29f6644c3dbd40ebb5a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous external URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of 'utm_term' parameters in some URLs indicates a phishing or marketing lure, likely attempting to trick users into downloading further malicious content or revealing sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://wastran.ru/uplcv?utm_term=mlbb+skill+hack PDF link annotation
    • https://festivaldelmaridaje.com/sgi_userfiles/userfiles/files/97472686229.pdfIn PDF document text
    • http://gs-metals.com/filespath/files/20210916084957.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/161377438edf2b---90403526688.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16139540d4d5e8---52413892536.pdfIn PDF document text
    • https://cevhertemizlik.com/userfiles/files/91351839965.pdfIn PDF document text
    • http://theaterbuehne-schwandorf.de/userfiles/file/60237993296.pdfIn PDF document text
    • https://pomtco.com/technical/files/file/rixulukafelanisipune.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144b105576ee---bukafiradolotizusobib.pdfIn PDF document text
    • http://ergakiland.ru/files/files/1864481903.pdfIn PDF document text
    • https://irantruck.ir/data/file/76202635349.pdfIn PDF document text
    • https://art4you.sk/editor_uploads/system/files/mamogejefigogirusi.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16133b9cab4845---20884149027.pdfIn PDF document text
    • http://www.darvidproperty.com/news/file/243999817.pdfIn PDF document text
    • http://15881588.com/ckupload/files/78035377954.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144b58c7f71d---jolonadunopakebozafel.pdfIn PDF document text
    • https://nanyangtextile.com/userfiles/file/6126836326.pdfIn PDF document text
    • http://businessplan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/93763076040.pdfIn PDF document text
    • http://bridgestone-ice-cruiser-7000.ru/ckfinder/userfiles/files/segovexeroruxamivebob.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/seduxonoxixarujawoworozaz.pdfIn PDF document text
    • http://gbfrjournal.org/pds/userfiles/files/vetoboga.pdfIn PDF document text
    • http://tucholainfo.pl/userfiles/file/gukivefukeki.pdfIn PDF document text
    • http://stfurnimart.com/file_media/file_image/file/54780905963.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/161445cdc81541---xulazopusinelufojuwo.pdfIn PDF document text
    • http://annamsaigonlaw.com/upload/files/85008253203.pdfIn PDF document text
    • http://33podarka.ru/pictures/files/raramazoru.pdfIn PDF document text
    • http://atrsara.ir/resource/files/kabeset.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_off0000c8f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e107.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE107 9996 bytes
SHA-256: ccfd378340dabab79f4d8e7717aaab41b7264fa72d00d8b7e9877271017ef292
font_02_sfnt_off0000f748.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF748 17084 bytes
SHA-256: c7af60bd600e15eade48307279f7a22503ff2c206a4e166aa5d9c3256106eabd

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