Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff6c56b326d0906a…

MALICIOUS

PDF

92.0 KB Created: 2021-09-20 15:44:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: db69d8236e6c76f3f19ee76441ae5c36 SHA-1: eff8b169ed8b81bc5936cfcbf076ce7f6165e799 SHA-256: ff6c56b326d0906ae8dcfe9bf038462703cf0d691f1de95a676bb52325c19a9a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://vocembalo.ch/userfiles/file/gukakibimisedawa.pdf In PDF document text
    • https://pvcmikser.com/upload/files/59755143181.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613568393a378---putejakuwiradafevojibake.pdfIn PDF document text
    • http://www.gdchgs.com/admin/img/files/tikativojeziv.pdfIn PDF document text
    • https://baatco.com/ckfinder/userfiles/files/77762054452.pdfIn PDF document text
    • http://paramountswimwear.com/userfiles/files/newiwofagi.pdfIn PDF document text
    • https://proektasis.gr/admin/spaw2/uploads/files/5795308698.pdfIn PDF document text
    • http://mxagproducts.com/upload/browse/file/nuwafajejurogasigal.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161336ee60a3ab---1200379306.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16139bcd5e6f19---48800331451.pdfIn PDF document text
    • https://lesura.net/userfiles/file/86166648545.pdfIn PDF document text
    • https://kemxoithanhhang.vn/app/webroot/files/images/pages/files/81316912067.pdfIn PDF document text
    • http://be-now.pl/userfiles/file/weduxalaminakenoxibuz.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146c847e034f---gifogetofeguwuk.pdfIn PDF document text
    • http://starinviter.com/ckimagefiles/50113902535.pdfIn PDF document text
    • https://www.newhorizonscrisiscenter.org/ckfinder/userfiles/files/vopadorajibobekitove.pdfIn PDF document text
    • https://sacc-la-chaux-de-fonds.ch/fichiers/file/madutojozogosa.pdfIn PDF document text
    • http://italy-ex.com/images/blog/file/75494716766.pdfIn PDF document text
    • https://creteotels.gr/FCKeditor/userimages/file/tirojatege.pdfIn PDF document text
    • http://premo.at/userfiles/file/93276605498.pdfIn PDF document text
    • https://laplacedesstores.com/upload/file/kurivipuziresewijen.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/fa65033bedbede8dfb3671c2363a087b/busejobelidofer.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/364f0e0f5f7bfa4b2403c9fb29c9fa58/57542526202.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=all+messages+in+one+app+androidPDF 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_off000105b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105B5 17168 bytes
SHA-256: bc4e7e351b92bfde504d306a857f92b131774a2cf619c8b71e6c0fb1a14bb2d4
font_01_sfnt_off0001321c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1321C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014a33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A33 10616 bytes
SHA-256: 9935f95330629704b40c36e8aa1df1ded6335e92d2df823978334a3e32998393

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