Malicious PDF — malware analysis report

Static analysis result for SHA-256 61a61c3bc2ecafee…

MALICIOUS

PDF

92.1 KB Created: 2021-08-04 15:20:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 68c519040920a26ab35d803a5b13d328 SHA-1: af497ef0ecb7ecce434280006daaaba59ddfde3c SHA-256: 61a61c3bc2ecafee5ed960a9eab97547821aa139a423839ddbb12bee676c5804
176 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The document contains a link farm pointing to numerous external URLs, many hosted on compromised WordPress sites or disposable domains, suggesting a phishing or malware distribution attempt. The 'SE_CALLBACK_LURE' heuristic further indicates a potential callback phishing or tech-support scam pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://krisoc.ru/uplcv?utm_term=exercice+anglais+6eme+pdf PDF link annotation
    • http://birzebbugastpetersfc.com/files/file/lobekivan.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/80879067254.pdfIn PDF document text
    • http://sungsam.net/userData/board/file/xikexokamifolijole.pdfIn PDF document text
    • http://touristclub.in/userfiles/file/13001182130.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/dc417f1a4dee20566ba8413dc0b3ecb3/vekimusuvoweguza.pdfIn PDF document text
    • http://say-international.eu/userfiles/file/kivesemokodomebokadipim.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/fc07fe2cc6825298d15dd831fb723546/42156292204.pdfIn PDF document text
    • http://www.ecostroyservis.ru/File/tumujidijabokipitopub.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/f89df1d4e08b8d671dc3c2193f639925/lirovosigomuxorudasulag.pdfIn PDF document text
    • https://premium-house.uz/images/file/sewobun.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608eb050c361a---pigejanok.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084cba10a22f---rikunemavu.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/cbfdb2b069dc7b1ad27a1cfd178540a7/92842179198.pdfIn PDF document text
    • http://cellesekorea.com/ckupload/files/91293848470.pdfIn PDF document text
    • http://cocoal.com/uploads/file/fusawekofobumal.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/a97713e89563e6a7e555d3cee9e01272/28096275358.pdfIn PDF document text
    • https://globalybm.com/ckfinder/userfiles/files/1626727971.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609875fb5332b---wukitut.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/47bc34917d70f1cfb117b88e82641118/34333634094.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a53ed0a8b76---83277983167.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160928cf4b8faa---98195478021.pdfIn PDF document text
    • https://tecnicamistasnc.it/file/21195794519.pdfIn PDF document text
    • http://tai-group.com/upload/files/jusijunatuwufibiweditize.pdfIn PDF document text
    • https://marosme.ro/hirek/file/78176099819.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_off0000fc30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC30 11000 bytes
SHA-256: 62df8af1caaf1f6ed9e0838b3ceb8aa9c8e435530e1402da83496d8ce357e31f
font_01_sfnt_off00011578.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11578 20664 bytes
SHA-256: a6129fdc6fcc676939cc6676753bb97cc50c3faa58b749b3c280225c47b04a39
font_02_sfnt_off000148f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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