Malicious PDF — malware analysis report

Static analysis result for SHA-256 c78221edfd527aa0…

MALICIOUS

PDF

71.6 KB Created: 2021-09-15 11:46:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 84ef14891ac6a3d512469721c2f40e60 SHA-1: b970e0a64424060587262601c9e0efbafa9f243b SHA-256: c78221edfd527aa02cc2d7cc85847df2f4f62dccd983bfcb6ffceb9cbfb9bb91
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier. It functions as a link farm, directing users to multiple external URLs hosted on various domains, some of which appear to be compromised CMS uploads. The presence of numerous URLs, including those with 'utm_term' parameters, suggests an attempt to drive traffic for phishing or malware distribution. No scripts were extracted, but the PDF structure and URL patterns are indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://queure.ru/uplcv?utm_term=4x4+rally+7+mod+apk PDF link annotation
    • https://giolog.biz/images/bulk_images/files/29901470037.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614179d23a0c5---lefusuzukogo.pdfIn PDF document text
    • https://equantumconsulting.com/files/files/jurexokufi.pdfIn PDF document text
    • http://beachfirebrands.com/userfiles/file/94178177561.pdfIn PDF document text
    • http://northmarking.com/userfiles/files/dakupanewoninopaw.pdfIn PDF document text
    • https://amoslodge10.org/ckfinder/userfiles/files/jupege.pdfIn PDF document text
    • http://baobianhkhang.com/upload/files/wagujomofa.pdfIn PDF document text
    • https://tour-paris-guide.com/cite_imgs/file/furazuxokozuxewazoj.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138babc0f540---tipizojowenises.pdfIn PDF document text
    • https://oreopay57.com/ckfinder/userfiles/files/82479292777.pdfIn PDF document text
    • https://ozsersogutma.com/upload/files/11475733084.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/16140309063567---zapipenobezigoju.pdfIn PDF document text
    • http://korea-labels.com/ckfinder/userfiles/files/rawojavepeni.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612eeb346dd69---xifofisuvufib.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/tubibejol.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613c3a43f0dac---18523318698.pdfIn PDF document text
    • http://giasudaihocsupham.com/Images_upload/files/sazuxawipubaxadotenuzu.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141629f89d56---98595508916.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd7a397664---55745143022.pdfIn PDF document text
    • https://kit-veron.my/ckfinder/userfiles/files/vidafevuzuxasizokopebu.pdfIn PDF document text
    • https://blagoustroystvo24.ru/ckfinder/userfiles/files/nuxiti.pdfIn PDF document text
    • https://amadesafar.ir/basefile/amadesafarir/files/ragupopexivi.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/bdd4b4a1cb589ec491d12206a033285f/42371029724.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_off0000b836.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB836 15792 bytes
SHA-256: b96da7107f304391f4df4bb945d94ed530c7947e6fc26f043952edf8f5ae9cbf
font_01_sfnt_off0000e02c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE02C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f843.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF843 10300 bytes
SHA-256: bb2492936e206e2fe58648e0c823160fda7e6cfda1dd2e47f04e0560b3da2051

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