Malicious PDF — malware analysis report

Static analysis result for SHA-256 9973a7e1f86df522…

MALICIOUS

PDF

78.0 KB Created: 2021-06-29 15:58:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7822a9576b5cc451c51cef474b6bc78b SHA-1: 264b5b02f3346cc116fc7712a1c32646d6d9bc4d SHA-256: 9973a7e1f86df522be7fb685d92cd5954bda3df3d65a624478aaa229ffda9386
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as a phishing trojan. It contains numerous links pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The file's structure and the presence of external links indicate it's likely part of a phishing campaign or a distribution vector for further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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=mr+queen+streaming
    • http://ihdbd.org/upload/files/losizefu.pdf
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/6483050c3cc565712d8f8c06766123cd/69871735378.pdf
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/hcq2u5jdfpnrqf7q06459v0mk9/22089311748.pdf
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/e7t4ntc0gqrq93gbv6d6nalpu1/91632920315.pdf
    • http://vietsonplastic.com/uploads/userfiles/file/32912106639.pdf
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae6463812d0---nowupazanegipi.pdf
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16082a3300fa48---2640798700.pdf
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/esu9lh8l0mbd5u06o4oo5paqi3/16524854729.pdf
    • https://samarpanbharat.org/trila/userfiles/file/72911805587.pdf
    • https://used-machinetools.ro/app/webroot/files/userfiles/files/mobowizodemetuwur.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7ab6ad5a20---rijoxetodenanumewixa.pdf
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16080239e78fd8---gozifuwap.pdf
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1e867ad24---51936826491.pdf
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16071d00c4ffac---67993714862.pdf
    • http://ats-dz.com/userfiles/file/27686287167.pdf
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/f351825527bb895a36f2e748c0fed4e8/13238576157.pdf
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/e861a604bd72f252ac2d7410f0a9fdce/22521571792.pdf
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/cb75bda9b399b6f0a9bb3dc14d500903/36929084044.pdf
    • https://virtualpulse.eu/UserFiles/file/66402601073.pdf
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/6849ea0c189ddf4e7caeffcdcf91c0b4/92175458870.pdf
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/5hvka1ffm32hm5k980jjb65icn/figuxubifikoxabunano.pdf
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160c5f09f30e62---47248369824.pdf
    • http://ddgasul.com/userfiles/file/2591159253.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_off0000cf69.bin
f8f48d8081d0b2ae8a2c94bcdf4ffc700532474f0dfe87e9b36ef980f6736e9b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCF69 16948 bytes
font_01_sfnt_off0000fb84.bin
026edf1501ebe275384def2c6a413df68a5a74eddc1a10a398347e0950de1039		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB84 10524 bytes
font_02_sfnt_off00011324.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11324 16792 bytes

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