Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce2316285cdb9411…

MALICIOUS

PDF

75.8 KB Created: 2021-09-05 01:50:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: e9b300174009d496ec50e2a085ec02bd SHA-1: f23592963bcfd267514990b66952a76d8a4e2668 SHA-256: ce2316285cdb9411d9259118c0121a289e49b0bd67fba1bb24ccd95993b25530
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains numerous embedded URLs, many of which point to compromised websites and disposable hosting. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a pattern of using these links for malicious purposes, likely phishing or malware distribution. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://ketchas.ru/uplcv?utm_term=keyforge+playmat+pdf PDF link annotation
    • http://www.offshoreyachts.net/web_upload/editor/files/zawavokina.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4c5d017bcc---73568973178.pdfIn PDF document text
    • https://terryhaas.com/wp-content/plugins/super-forms/uploads/php/files/016295d5727d82a0b110d1734225a597/pivagipuralug.pdfIn PDF document text
    • https://cristalparkhotel.com/ckfinder/userfiles/files/semaroxudaxilevezed.pdfIn PDF document text
    • https://electrabicycles.pl/app/webroot/uploads/file/16209822776345.pdfIn PDF document text
    • http://fullx.net/files/norekog.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a519289a82a---35876673198.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2b0c890dac---biregupenipo.pdfIn PDF document text
    • http://gabortech.com/admin/file/25974126040.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/16087da2b3802a---34732484276.pdfIn PDF document text
    • https://mimpisiluman.com/contents//files/zujaguju.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/a778447970770ba3da0ba8e84bfc116a/detugodinasafozid.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160736adc805d8---rovezumamet.pdfIn PDF document text
    • http://maekuangudomthara.com/ckfinder/userfiles/files/59421283987.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16099d84f25a24---fidowudogu.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/562c7ba60a4c30e897b1fa7c959de406/24679975188.pdfIn PDF document text
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/4c7027050ef8b5b59a6065a0b2e48b78/defidaxunujotoweja.pdfIn PDF document text
    • http://trekkingsapatours.com/upload/files/tefumesamapasixilididi.pdfIn PDF document text
    • http://paulsaperstein.com/userfiles/files/47663556973.pdfIn PDF document text
    • https://ghadir-eng.com/userfiles/files/3354966945.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/jasozunesuxupobopowekir.pdfIn PDF document text
    • http://dharmapremipariwar.org/userfiles/file/95065528520.pdfIn PDF document text
    • http://gdgom.com/upload/file/210614113152045399s6e7sc2ycpyf.pdfIn PDF document text
    • 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_off0000c51c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC51C 10580 bytes
SHA-256: 31766ced378527d4e9f1803cb0b07d5cdd3544cc07373d42c951d942cedda278
font_01_sfnt_off0000dd28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f53a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF53A 16972 bytes
SHA-256: ef7a520f205b4724e7cbf19d769a36c8fb03e43d62c426ff6ef23bd735c1fec8

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