Malicious PDF — malware analysis report

Static analysis result for SHA-256 8158f93336323293…

MALICIOUS

PDF

85.6 KB Created: 2021-09-04 07:51:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c03d871d815e6412c234d665b74112a1 SHA-1: 9f7316e3300e32ec6599ca597a63a7461a864a9f SHA-256: 8158f93336323293a9d346a7dbca20520a9dab9772f41948cd6a3c6fc3fd3c70
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or are part of a link farm on disposable hosting. The 'ML_NYX_PDF_MALICIOUS' heuristic and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's used as a lure, likely for phishing or to redirect users to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://smidgel.ru/uplcv?utm_term=keysight+oscilloscope+user+manual PDF link annotation
    • http://4reality.cz/userfiles/files/kogaxubalivijuw.pdfIn PDF document text
    • http://mtecommerce.it/public/news/file/timabidofowuvutekim.pdfIn PDF document text
    • http://remont-elektro.eu/archiv/file/viwosexax.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2e61a75dc---32313354762.pdfIn PDF document text
    • https://x-software.cz/data/file/32445986321.pdfIn PDF document text
    • https://projectmine.hu/ckfinder/userfiles/files/womipomowagabif.pdfIn PDF document text
    • https://istocdukkan.com/userfiles/files/leminiloj.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/07jce9t73uj0r667ada7tmt187/5081367476.pdfIn PDF document text
    • http://escqatar.com/uploads/userfiles/file/file/zabimifejusulezid.pdfIn PDF document text
    • https://mudraconsultancy.com/uploads/files/nuxevazilariwekosilu.pdfIn PDF document text
    • http://ttlh.vn/storage/ckfinder/files/mapoxipadumimosagivilez.pdfIn PDF document text
    • http://clairerolo.com/userfiles/file/gusefiw.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160726ea77ace4---dazipagepimojexejuxuf.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607f135f4d6b1---45065874765.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/o48bb2g1qji2ghmpvs4ara39q0/petogowosagegofatubasuneb.pdfIn PDF document text
    • http://vralumni.com/clients/7/71/71e0d721b250bdad3664bf54e70089ab/File/bipewipuj.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/915ee3f1175962d76d6a3143d919ab51/53684583909.pdfIn PDF document text
    • http://www.lukoilmarine.com/ckfinder/userfiles/files/38182095334.pdfIn PDF document text
    • http://singlesync.com/userfiles/file/82862892885.pdfIn PDF document text
    • https://techson-cctv.com/upload/file/24782929144.pdfIn PDF document text
    • http://jullien38.com/ressource/site-image/files/zomapawudoseditomosefexo.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2861c5ebd7---32985705826.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d15d1a34a9---85647577682.pdfIn PDF document text
    • http://tieuhocsondong.hoaiduc.edu.vn/ckfinder/userfiles/files/17317475665.pdfIn PDF document text
    • https://kisikana.hr/UserFiles/files/jovofetukezasi.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_off0000e850.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE850 18144 bytes
SHA-256: 795e837f355bdc21dc76fb92aa54354a7be8db68f2279ad79773f2f382182efd
font_01_sfnt_off000116c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116C7 11024 bytes
SHA-256: 0bac589ec02b49530bf970141c3d9daf099400432993e81b996100fb234174d5
font_02_sfnt_off0001304e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1304E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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