Malicious PDF — malware analysis report

Static analysis result for SHA-256 811921e77d8f0436…

MALICIOUS

PDF

84.9 KB Created: 2021-09-05 01:56:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e2d0df485a840375a98d057d6969be36 SHA-1: 89393f9460a31c492126dd309bb5be47963ff69f SHA-256: 811921e77d8f043683ab12e66fc414732f965c5cd78367b52f24122410fc2e72
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also features numerous external links, several of which point to compromised WordPress sites and disposable hosting, suggesting a link farm designed to distribute further malicious content or conduct phishing. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://baraanduliaptti.org/userfiles/file/34924397102.pdf In PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/16082638ff277c---xusurefapirezalovoli.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609d0afed46bf---newojiduzoxerituwagutegu.pdfIn PDF document text
    • https://tranduongauto.com/app/webroot/files/images/pages/files/18814188453.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075bfde6985f---27758550028.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/a1986098ddd801266dea988f7f81531f/lazoxojaremenu.pdfIn PDF document text
    • http://famillespourstarlight.com/clients/a/a9/a9b42c05011d3bb27e7f7ec2ed30324f/File/lakipiwipo.pdfIn PDF document text
    • https://anyimaker.com/upload/users/files/fanavidubo.pdfIn PDF document text
    • http://lhs75aa.org/clients/0/08/08eb77d093c5251d787cf05842b4a73c/File/48408793534.pdfIn PDF document text
    • https://zlato-eu.cz/upload/files/93865371798.pdfIn PDF document text
    • https://deitratech.com/userfiles/file/wazutuva.pdfIn PDF document text
    • http://theprofitnesstrainers.com/userfiles/file/fujolunegenuge.pdfIn PDF document text
    • http://eschool365.in/js/admin/uploadfiles/file/wawasum.pdfIn PDF document text
    • http://baheth24cars.com/ckfinder/userfiles/files/33263406554.pdfIn PDF document text
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/8aeb531c50f2654e9a8f35de1ebbab59/siziragojesi.pdfIn PDF document text
    • https://atraba-holding.com/userfiles/file/79393973471.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/eaf6f4f325f61139f0de7275b07ab475/bowivonuxoxerusel.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1608ce444b37ee---42174844306.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/80773659072.pdfIn PDF document text
    • http://originalbau.hu/imagesfiles/12963611461.pdfIn PDF document text
    • http://studioguagnoni.it/userfiles/files/22745192598.pdfIn PDF document text
    • http://residencecarlofelice.com/userfiles/files/26621466689.pdfIn PDF document text
    • http://autoscuolauniversale.it/userfiles/files/86538747014.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afb3e9b74ca---9034278855.pdfIn PDF document text
    • https://egyediajandekotletek.hu/mvc/userfiles/file/mewopuwalofonuxuni.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=logitech+g933+wireless+gaming+headset+manualPDF 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_off0000e503.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE503 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD15 17960 bytes
SHA-256: a6580fd20b9c227cc49880267b3a98c58e0ba30eafa430c6c555527e16bb3e4e
font_02_sfnt_off00012bbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BBC 11300 bytes
SHA-256: f7c44cf6375a8060bd56abdcd5dcd37730915ef93536ba05ec87b6cf55e21a1b

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