Malicious PDF — malware analysis report

Static analysis result for SHA-256 892175bf08f6f4f9…

MALICIOUS

PDF

80.3 KB Created: 2021-08-28 21:09:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 714d7cbd1660ae8efb3d8b10473d99f4 SHA-1: 0340ad06324666432e1bc2465598890725b46936 SHA-256: 892175bf08f6f4f95a84f3cfd3224c96fae247a3fc962fffb23b2d78d3fc9597
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting. The heuristic 'SE_INVOICE_LURE' indicates the document's content is likely a fake invoice or payment request, designed to trick the user into clicking one of the malicious links. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://irlanc.ru/uplcv?utm_term=conditional+waiver+progress+payment PDF link annotation
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/254011e0f94ab4082f811985c3870371/vunubifezewekejol.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/6o5c7n6ts984epi8ms6moult65/gozegipebigodekezufij.pdfIn PDF document text
    • http://lurome7071.com/clients/e/ec/ec9741bbacd2a64db66b94b03f3cd24d/File/55640022349.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/591329f012edab6fe56ac8cd5024bf89/jotufose.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a448beda92---49206777855.pdfIn PDF document text
    • http://bundoreh.com/fckeditor/files/file/82425489649.pdfIn PDF document text
    • http://wxhsbl.com/ckfinder/userfiles/files/20210626_045244.pdfIn PDF document text
    • http://vietsonplastic.com/uploads/userfiles/file/35684177174.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16083e880b0595---dapuvixajudozogokezup.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/65247339f1b832b7d0c155930c7fa03c/17089724550.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/83516961676.pdfIn PDF document text
    • http://lovec.bg/root/ckfinder/userfiles/files/20844748751.pdfIn PDF document text
    • https://dimensioninteractive.com/WYSIWYGImage/file/magowosagudaxukomevo.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b78873524d7---55501846869.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/e4e2abcd3ee168773d90969533c6b18b/82469887503.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/r3hrm37dkib5p5fl2eeb21lgre/bexelakipipo.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607b51731e85b---subezosimodafafunikazip.pdfIn PDF document text
    • http://limoride.net/gallery/file/zojivarofotozofizimiko.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/wurawur.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/b236da2ceb25788200b321a60217ccc5/69961237931.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/11ca961cb006b6c2f20119f4d247f93a/nunedale.pdfIn PDF document text
    • https://dewalt-naradi.cz/media/upload/editor/file/14711738200.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_off0000d4c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4C8 16920 bytes
SHA-256: d58965f82ab8f5e3c89b278c3652a6593e04cf78b33e0ef98712a43c26e68fb7
font_01_sfnt_off0001006a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1006A 11032 bytes
SHA-256: 0ff329597bb53478d9cf39e1686fd9307fd19828a647e364fc896db33ac45c6f
font_02_sfnt_off000119f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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