Malicious PDF — malware analysis report

Static analysis result for SHA-256 78ef18036c60ca44…

MALICIOUS

PDF

75.7 KB Created: 2021-09-04 19:03:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 93fb0d7ad4a10c6484cdbafbfe967fb0 SHA-1: 38d8efcd1344963bd538a0a45aaf1e865e05dba3 SHA-256: 78ef18036c60ca44ba50f9f26ba9d574c261aece53d654a570d7893a179269b2
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including ClamAV detection and an ML classifier. It contains numerous links, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to redirect users. The presence of external URIs and a link farm on compromised CMS uploads indicates an attempt to distribute malicious content or phish users. No scripts were extracted, but the overall structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 http://bsl-trans.ru/admin/ckfinder/userfiles/files/gegupi.pdf In PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aafb57a3c31---kilezigozivuza.pdfIn PDF document text
    • http://designbeginnings.com/upload/file/49573258998.pdfIn PDF document text
    • http://arabstina.com/ckfinder/userfiles/files/vazapewomaxonid.pdfIn PDF document text
    • http://biondiairsystem.it/userfiles/files/84430656253.pdfIn PDF document text
    • https://dolaodong.com/userfiles/file/zozula.pdfIn PDF document text
    • http://sumbulefendiegitimvakfi.com/resimler/files/finotawifarasafupa.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/ede6cccc39dc365d9793e2bddf4c1e99/belemenosudifepabufu.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/b423ea5232e8a734843853707f09c91c/tugunoxu.pdfIn PDF document text
    • http://cuatudongnhatrang.com/uploads/files/wowaxedibasetadero.pdfIn PDF document text
    • https://nnkcreations.com/userfiles/file/zakiseg.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160adc9d52e192---jizuwin.pdfIn PDF document text
    • http://dagmar-e.de/userfiles/file/58311947037.pdfIn PDF document text
    • https://et-auditing.com/userfiles/files/liresivu.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/ff5b010b370b9ede5875eb6d68cf123e/74708516819.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/14309465552.pdfIn PDF document text
    • http://motocams.cz/ckfinder/userfiles/files/kawaned.pdfIn PDF document text
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/363874cae020ae4cf95392bbcb500068/bibojogozedidutuvixu.pdfIn PDF document text
    • http://157.230.241.115/image/upload/File/30661320825.pdfPDF link annotation
    • https://zohopin.com/calisma2/files/uploads/kokixepifopekasuvisusem.pdfIn PDF document text
    • http://rebizplus.com/userfiles/file/lotufosugepuvavirog.pdfIn PDF document text
    • http://niestachow.pl/data/aktualnosci_imgs/file/tuvumarogebasadafomofetof.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/rv0uqvvnr5rtdkoj7lv24gtkm1/fetupuzojerejazimo.pdfIn PDF document text
    • http://el-system.jp/uploads/2012/files/lurari.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=insulation+materials+testing+and+applications+pdfPDF link annotation
    • 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c383.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC383 17140 bytes
SHA-256: 399f7c83f2a71c5d24221dd20c3606c9a24c5c95de67c94dc723e9c6db8b9451
font_01_sfnt_off0000ef5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF5D 11012 bytes
SHA-256: 203b794e3524710008146f565e1a730c09316586e2ca8935f3419299c73d87e2
font_02_sfnt_off000108bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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