Malicious PDF — malware analysis report

Static analysis result for SHA-256 d368d66f7bb774e5…

MALICIOUS

PDF

104.1 KB Created: 2021-07-08 00:11:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ae0f31a108aa1fcc1f8db6da0464485c SHA-1: b157ac71cb4eb1277a1a24d6f62d89e270a543db SHA-256: d368d66f7bb774e592e3b52d382e72e2ae7cbd932bdafc3335ee0c5591726fa6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing numerous links, many of which point to compromised WordPress sites utilizing the Formcraft or Super Forms plugins. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as phishing. The presence of embedded URLs and the structure suggest a link farm designed to redirect users to potentially malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9926

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://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160d5cf4827cb6---sujurafusid.pdf In PDF document text
    • https://www.dartmusicfestival.co.uk/wp-content/plugins/super-forms/uploads/php/files/edea04bb0e4d65e486e95aa339ba53ac/wakerewunuzabim.pdfIn PDF document text
    • http://dribblebar.pl/userfiles/file/88786263642.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d3628190cb4---58336778204.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/d37a6c7a0d77017b8d0adf87d485a222/93522778111.pdfIn PDF document text
    • http://www.greenbriarpropmgmt.com/wp-content/plugins/super-forms/uploads/php/files/88d69c0ecf71888b81e0d9c6ac1b16a8/lalewonaxojofeduzogub.pdfIn PDF document text
    • http://zoop-tech.com/ckfinder/userfiles/files/fididitakirulezalopikawew.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160b956c51ffdd---34597407147.pdfIn PDF document text
    • http://studio-castiglioni.com/userfiles/files/kubarojaku.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/2e35278e141751883cf8d0241be03876/nebivosugolagiviw.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/9b7b4f8f8289793bee1275b84ff9411b/37780699991.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/3u31p6onrgelqlsipsk28gfs22/81678101118.pdfIn PDF document text
    • https://pointswestliving.com/ckfinder/userfiles/files/sokerafinavok.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/e38cfb2f287c6813f2313207bd8fb667/zotokefarofide.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/vubapog.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e2a171690c4---giginosaralagivetibi.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607195d4a2e76---93837500264.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e0b352b9ab7---daxamuxupogebon.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/damaxetaremez.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c2142d0cdbb---90479854276.pdfIn PDF document text
    • http://bhsclassof70.com/clients/a/ac/acf0241a72c9eb28a719a759cf8a4748/File/70659058042.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/winuji.pdfIn PDF document text
    • http://ozkayalartrans.com/userfiles/file/29869834790.pdfIn PDF document text
    • https://victorybear-info.com/userfiles/files/falubusane.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=gama+meaning+in+englishPDF 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_off0001301b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1301B 10276 bytes
SHA-256: db51d2e6c8992c18c8ee7ddbdcbefd4d4d9665ce08bdfd4df70c13c3ce77f831
font_01_sfnt_off000146fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015f10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F10 20468 bytes
SHA-256: 2bca3eb321fc733bb0a5cc7ef7c90ddd88b4f4e10ecd7d912911096eb6daf3e7

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