Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1d8862d6c282ebd…

MALICIOUS

PDF

82.1 KB Created: 2021-09-04 04:11:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7f9268b46b073bb20493be97605b5039 SHA-1: c9665aa184acb5a8b5481c945f4f49c15812fec8 SHA-256: b1d8862d6c282ebdcf07487756ff2fe7e0da12a58f9c132a8b04ff8361380b16
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. Multiple heuristics indicate the PDF is a link farm pointing to compromised websites, likely to host malicious content or facilitate phishing. The presence of numerous unknown URLs suggests a broad distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c341d094ea8---rotodiv.pdf In PDF document text
    • http://aqbnb.com/uploadfile/file/wivegiki.pdfIn PDF document text
    • http://enovosti.info/ckfinder/userfiles/files/nesebowesobelaran.pdfIn PDF document text
    • http://tinavaron.com/ckfinder/userfiles/files/nipevogapatikumetuv.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/ffbea47fe751d6128a56b524fca31deb/37694423445.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/8ab61d9a95bab0dd1f525885b842ee88/vemezanajetajuzawisu.pdfIn PDF document text
    • http://degeninhotel.ru/admin/ckfinder/userfiles/files/1007007068.pdfIn PDF document text
    • https://melz-feu.ru/upload/forajujig.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16110ce4b3811d---sigogibelerajulagugixame.pdfIn PDF document text
    • http://cuacongtudongbinhduong.com/upload/files/17936898006.pdfIn PDF document text
    • https://biocoils.com/img/file/77790982825.pdfIn PDF document text
    • https://baxsporthorses.nl/userfiles/file/jelive.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089110980d8d---mubutuvanano.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082e3f4d8216---womodobesasekawog.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1611d0fa19b3a0---koriverudadejaze.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610bf1740af91---pojirozenur.pdfIn PDF document text
    • https://assignmentmart.com/ckfinder/userfiles/files/guguziwu.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/92301ae217cdcdebd4a7ce0621bba675/wipevinozobo.pdfIn PDF document text
    • http://etpatatietpatata.com/userfiles/files/64587611336.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/q5u3kbnt9quuke85p3ek723oa4/62824729688.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/sk3ofnuha1vpvlaffbukop05d6/jebezutulazibesadapinox.pdfIn PDF document text
    • http://sushiloverca.com/uploads/files/77780149985.pdfIn PDF document text
    • https://horacebatten.com/ckfinder/userfiles/files/56073165651.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=oral+hygiene+book+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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFA7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B9 16424 bytes
SHA-256: 7ed6b0d9f4a3be0517cca24a4a2beccc4372d597d2a5e89275d4aa54bab09bee
font_02_sfnt_off000121e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121E8 10884 bytes
SHA-256: dc52ef80062af084ec8cd3e445172c3f1ce0d2615980e8b383ae4dd207650e24

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