Malicious PDF — malware analysis report

Static analysis result for SHA-256 65abfeabd83a08bf…

MALICIOUS

PDF

97.8 KB Created: 2021-06-26 16:44:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7c4ec91ef1b3f168dd3c3dc8270c7496 SHA-1: 6eaf868e270ebeaf1dd2f3a48c2a4e4f13d2082e SHA-256: 65abfeabd83a08bf7a3e8c28c9c6ee2f54ba56dd37c6294c596bc8d79b6fb3aa
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating it is likely a phishing or trojan delivery mechanism. The heuristics suggest it functions as a link farm, directing users to various compromised WordPress sites and disposable hosting domains, likely to download further malicious content. The presence of embedded URLs and the 'Fake invoice / payment lure' heuristic strongly suggest a social engineering tactic to trick users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9800

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://coretry.ru/uplcv?utm_term=thesis+about+business
    • http://hnc2.com/userfiles/file/82178264133.pdf
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/e4c5d2774fb6bd83835532667373f09e/jugafobasaxepenisuroli.pdf
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160aa227700e64---30397065070.pdf
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/f0654f27eb027cae244e6bff823ab5f0/wixopewukaribefu.pdf
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac3216dc6d5---94570422156.pdf
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/1608936999bad3---fixibitu.pdf
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/91541429dfd70e5fdc8b52febc8881b3/jafofetaxolinisuxizorozab.pdf
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c6c3cc2b239---zurisukasapemuxudu.pdf
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16077465e3d71e---kapexevewatol.pdf
    • http://msiutilities.biz/documents/sonajijixiwobusakuto.pdf
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6a5e87e56---16209156507.pdf
    • https://rm-parketi.si/uploads/gonex.pdf
    • http://www.urbanwaterways.info/files/potatedol.pdf
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073dcac1c618---rubumigilap.pdf
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160add59d9cfb9---53517934702.pdf
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/vgll8u167f0fvdmk1h6lr9v855/59043725323.pdf
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160780b587bf17---zolopubududurimigebano.pdf
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/a54c37dcc4049e64088cd13862305ed8/7464137903.pdf
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/40bb3b6608318379f06914646ea10ffc/mepafirubusiti.pdf
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/71b07ee3576ff59210a1ef39b9a4895e/87889346114.pdf
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/28a86f894e498e1e9aae18b0af135e36/98934322382.pdf
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/da7e00fc8b0a66de9ccc6d22a2e619a1/vebojugakof.pdf
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160ab7dcd42c4b---25763274420.pdf
    • http://zonwering-belgie.com/ckfinder/userfiles/files/ditoligexesowemaxovadut.pdf
    • https://secolink.sk/userfiles/file/29725319783.pdf
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160711706be1b9---tuxekigumeruw.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011b86.bin
41b7a660b4b3d1d3fd120852768f7f264a99e0ebe51709f77b1b589cec118a70		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B86 10260 bytes
font_01_sfnt_off00013298.bin
ef6b8f6d2e30b35cc890bca6f176f7a782cc2f672cbf9adcfc44b50c523f03f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13298 17756 bytes
font_02_sfnt_off0001604a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1604A 16792 bytes

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