Malicious PDF — malware analysis report

Static analysis result for SHA-256 657c2a4cdc8b16e9…

MALICIOUS

PDF

89.7 KB Created: 2021-06-28 16:03:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bc39093574695240e6058161689364fe SHA-1: a448135839dfa3bf1035414b696d432ec5da404c SHA-256: 657c2a4cdc8b16e940c69adcdb9ec75f01dc125398fd2018e4d936848d85540a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links, many pointing to compromised WordPress sites, suggesting a link farm designed to host or distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a39a35e5c54---fefadibodexivikab.pdf
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072ca067e647---67648134379.pdf
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ae73ebee24e---fegamigi.pdf
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca10b89425---feluzodakofa.pdf
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/881f42043861cdc36189bf41b2435cee/fozug.pdf
    • http://interiorconsignments.com/media/file/98180339462.pdf
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b38a78d9d23---65776481135.pdf
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a2ae2fb4da6---83525797242.pdf
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/p4iqh3pg76jrf40vdd3dmamcd0/kabagakapekuxogivisu.pdf
    • https://dm288.com/slicice/file/tozovataguzarivonugiwexad.pdf
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b1dd6f248f---topafimigujugumu.pdf
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160769f3f3079c---marojajafega.pdf
    • http://polish-house.com/uploades/fckeditorfile/gavelitelovimosavil.pdf
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/fdf1c20a061cd5acf80dcdd7146648f0/rimixokosapasevidew.pdf
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/10b4cd73ebafa4dc6fcf4d6a3eb6fb76/31770015314.pdf
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/fce8614f5b37e60daccee773c9897f98/96131383064.pdf
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16074c6fd1178b---lifugapu.pdf
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c85a67b0aad---17600499625.pdf
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8db8ee50f3---rimorefawogugudut.pdf
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a2a85d9b089---satogosugi.pdf
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072bd3f9ca70---vewasexeza.pdf
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/p45h24opq1kf75afkdf6u38m8q/medetirufexegivo.pdf
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/9ca07813f2dcbb1097de96f661d063bc/98232031232.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/j5cal9l9uodptiu04dpc88vgue/bagigaxirebajusirumu.pdf
    • http://wksystems.net/HotelEstimator/userfiles/file/palazixupadelobubofuj.pdf
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609d018313ec8---39029190619.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=six+x+full+movie+download+720p+filmywap
    • 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_off0000f9f8.bin
47ffd48cf2b487b4b93e62f45eaf77e49872fb842c6422096086ffc3abd3c68b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F8 17376 bytes
font_01_sfnt_off000126ae.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x126AE 16792 bytes
font_02_sfnt_off00013ec5.bin
7a8a21cfbd9d39e50d0ac9de2e80e8722b8bb7b0e5740f9017c89b88cc9c7967		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13EC5 11128 bytes

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