Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cd396a9c7858af1…

MALICIOUS

PDF

93.3 KB Created: 2021-07-23 03:34:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 047385e447e78068050811379ed1c6b0 SHA-1: 2eb94c9657e489a6e0f124d3a511f39cbce41526 SHA-256: 0cd396a9c7858af1478ff887c7122dea6d53519d37d7a003c5ab083d3f4c27bd
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress upload storage and other disposable hosting sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the heuristic firings and URL analysis point to a campaign leveraging compromised web infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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 https://novahealthclinic.ca/userfiles/file/5644687865.pdf In PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/aj653vi7fem9ls5jc1b3c65sm0/59471415600.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1607a083ec1cf8---kogosebenavotutodolam.pdfIn PDF document text
    • http://sacmacbook.net/userfiles/file/59539059511.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/cdc512db90fe5cfcbf2756bed7c43967/tazoxodusotesasuluvivuv.pdfIn PDF document text
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/xulor.pdfIn PDF document text
    • http://yangpupark.com/uploadfile/files/nejowopubolosubodibid.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/12mn1ncncd0j358cf744tkij81/tokenelozem.pdfIn PDF document text
    • http://auapp.ch/userfiles/files/jadenamefen.pdfIn PDF document text
    • https://sunarchegypt.com/userfiles/file/94482380841.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160854f4076c91---37634619132.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/5fa7156d86ec120fbb97e3c02d58b329/10165634249.pdfIn PDF document text
    • http://www.elstar.ru/uploads/files/89687025928.pdfIn PDF document text
    • https://novahealthclinic.ca/userfiles/file/bejasonekufalavupesade.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1608785045a31c---bitaze.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/89732469369.pdfIn PDF document text
    • http://kurier48.pl/files/userfiles/file/topuritiliruxun.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16093f4c86169f---kovolegirapivubuzuturad.pdfIn PDF document text
    • http://divorcefinance.nl/uploads//file/kibekozajirorudedaf.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160813a4b3b449---dimarezut.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/dd594e110acd96ef2c8b2ab60ca6defb/jinobipiwesinokuzafoxu.pdfIn PDF document text
    • https://sabagdasarov.ru/upload/file/biwaloganujaditevuwa.pdfIn PDF document text
    • http://childconnect.com/swi/fckfiles//file/ketav.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee2d520c9e---47415392958.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=french+future+simplePDF 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_off000108b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108B5 10540 bytes
SHA-256: a5fba099851d007ac288575ff37806c6776e9a225de28d0570ea53368affd9d3
font_01_sfnt_off0001206f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1206F 18220 bytes
SHA-256: e603b009f19f0d4c24d2f09808eae180e65bbb2e002fa1f2673b06d598c41bbf
font_02_sfnt_off00014ee4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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