Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cc7f0e435a2a134…

MALICIOUS

PDF

85.0 KB Created: 2021-07-13 20:47:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 91b5fa5140910883503e713d0f7be7d0 SHA-1: e17b6901f5d2b96b59046dd4cf64db86d81d8f92 SHA-256: 0cc7f0e435a2a1347941377bd5e25da1331cb90bec5bd8a950c1282fa85796c0
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://kristinanamaste.eu/files/ligafapilugi.pdf In PDF document text
    • http://feriaalainversa.com/uploaded/files/51694586184.pdfIn PDF document text
    • http://bezagsecurity.cz/userfiles/kowedozonepuwed.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/qh44cumu33tag5mtm9ie5s986p/37558243218.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e49c30d6d5f---75274771779.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/07nkdrhjh9pti4qp4acrkjp70r/zezodisuzuzomuzovo.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608d316b474e4---32584704194.pdfIn PDF document text
    • http://vivaibonomo.it/userfiles/files/sikagemufufowiwevagaxeza.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/kikf5ed19o6a8fh5rre7tkqv09/javufidatub.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b18a47040c5---bixoz.pdfIn PDF document text
    • http://nanumed.ro/uploads/files/bonomovofezafasukixulefa.pdfIn PDF document text
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/b28d496f7d8f930ae6298c6fe11972ca/6228856863.pdfIn PDF document text
    • http://aiskreunion.com/clients/b/b4/b417c2091670ce0b0d78f4b231aea02c/File/79480139975.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/f713f7860ddd130dffe281ed15065961/30808166833.pdfIn PDF document text
    • http://cariboohose.com/userfiles/file/goribuzisukakalozijibez.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1609e1bc50f202---zonojixanefuw.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b40bc516093---pejimarofik.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608a580d53685---molawagexopojamidofiv.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.com/userfiles/file/29362518617.pdfIn PDF document text
    • http://vietsonplastic.com/uploads/userfiles/file/kiraturesizubejoxumewopis.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/korm7o8829i2ju9iahg36jbmn1/mumebedaba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=you+do+the+honoursPDF 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_off0000ebd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD0 17420 bytes
SHA-256: 3f78795e181819185331b0ff1b26161b8ba171a5b89d9b04da4c2b415cb73645
font_01_sfnt_off000118be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000130d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130D5 10128 bytes
SHA-256: 1036824884533ab22be0219210ed4a5e60869ee85d3583474101ac60481d4dae

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