Malicious PDF — malware analysis report

Static analysis result for SHA-256 23768441b857bf35…

MALICIOUS

PDF

107.0 KB Created: 2021-06-27 11:48:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-07-10
MD5: 6fd134ea459c88d32de9d2c3e225906d SHA-1: 11cc2872c14630c88cc40c8ec26aef81a997c069 SHA-256: 23768441b857bf357bbe6d0e8db66e676ff57bba716e9d32781b8fdb58a1031c
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. Heuristics indicate the document functions as a link farm, with many URLs pointing to compromised WordPress upload storage and disposable hosting. These links likely serve as a lure for phishing or to distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://permianhighschool1970.com/clients/e/ef/efee9fcbc667252fc4b649c8163d3733/File/nekizo.pdf In PDF document text
    • http://lighthouseofworship.com/clients/44803/File/71923629508.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160ae3c5ed8964---89247376976.pdfIn PDF document text
    • https://moscowfashion.net/content/xuploadimages/file/80355715296.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16082ed99954ba---wijumadamomin.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d853f50dfc---24749728832.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/5s3nertf9ep1qs4bd4g7gg10la/fevopizisifajimugiloz.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1608b108e1dc6a---woxuzimobixomofa.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/40a0vgb01dtklvi6tptjlmc63t/54755852895.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/a9d4f8e3b7a7beaa3537b404ec13ae9e/fitoketawixosevetidoz.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b0aa68201d3---49134991637.pdfIn PDF document text
    • https://koratspring.com/upload/file/lulanumow.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab88c5beb9f---39641225188.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160795d5ca5ba9---jixafijolawamivukagepo.pdfIn PDF document text
    • http://orchid-daikanyama.com/userfiles/file/mixalurikitugexokeduxug.pdfIn PDF document text
    • https://stpeterscbs.ca/ckfinder/userfiles/files/41383292871.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4606e6f33e---dagamoxaposewudo.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/a2534942f5939f6bf0500bd417dc902d/19824866823.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160a9f299e6fbf---xelakorobu.pdfIn PDF document text
    • https://steklo-shik.ru/userfiles/file/49975104194.pdfIn PDF document text
    • https://ensasoft.com.tr/wp-content/plugins/super-forms/uploads/php/files/8i3mp9sp0tvfv1rcgi3l8fedas/bugulezujavaririfove.pdfIn PDF document text
    • https://mdteam.se/ckfinder/userfiles/files/doxafosusij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=3inch+in+mmPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011a77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A77 9744 bytes
SHA-256: aba14c959b5c1f6484ccfcf357016bfe816543ace9087e56d997f63afa0a186b
font_01_sfnt_off00012f5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F5C 31768 bytes
SHA-256: 327ceeaa98d64710ae2764131e46ae1bdac7bd00577be812a41ae1c241b9bb37
font_02_sfnt_off0001711e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1711E 16120 bytes
SHA-256: d67e846df74fae85413b4dbff1f372ead4194f122dea4de5c3b7eb34fa320503
font_03_sfnt_off00018668.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18668 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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