Malicious PDF — malware analysis report

Static analysis result for SHA-256 85a0f4583c77e860…

MALICIOUS

PDF

88.6 KB Created: 2021-08-19 11:55:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 36a7dccfcc223ebe160fdffaf012bf4a SHA-1: d2a5c66b8b52a3919feb549e2a7a366a74e00f91 SHA-256: 85a0f4583c77e860b427e0ef17d92208b5f03eadfc25c854b989f0de1e0e6b3d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external resources, many of which point to compromised WordPress upload storage or disposable hosting, suggesting a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084a57115fa4---78844617347.pdf In PDF document text
    • http://bjaimama.com/data/upload/2021/05/file/202105231945354154.pdfIn PDF document text
    • https://nothingbutsafetyglasses.com/userfiles/file/38820730594.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/17d5fo1g7fcficiclt5a0ifgmm/vukogufago.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160f42675aa7dc---95724103137.pdfIn PDF document text
    • http://sungwoneng.com/upfile_editor/2021/files/83258722680.pdfIn PDF document text
    • https://ascii.tn/web/cgi/file/xiramas.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609957784acaa---21680543070.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/19006157929.pdfIn PDF document text
    • https://verredistri.fr/xmedia/file/91380437580.pdfIn PDF document text
    • http://tremonttemplemacon.com/clients/862779/File/sijeruxubezawuduwaxalem.pdfIn PDF document text
    • http://ajarnveerapong.com/UserFiles/file/3120341814.pdfIn PDF document text
    • http://xn--o79av69abka850ab6c.com/upload/file/202107071227555266.pdfIn PDF document text
    • https://bushregenerators.com/userfiles/files/59212960823.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160b45578aa3b4---gupuwataji.pdfIn PDF document text
    • http://inse.us/uploads/images//files/71753976913.pdfIn PDF document text
    • http://msinternationalbeautypageant.com/clients/8/8c/8c0f0497d7166b07b5568c04be8084ca/File/23365947732.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/20210710/210710083222354981sx0mpax11xdo.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160aa722721466---fanaxekaxanijodajirojixux.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/1606cc46d5d0b8---14856373930.pdfIn PDF document text
    • https://watfordfairtrade.org/app/webroot/img/files/92776935532.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/kotin.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/sk34ckobhd2ie8uk1a2giniqv1/69988784362.pdfIn PDF document text
    • https://jokerprod.net/userfiles/file/41417004796.pdfIn PDF document text
    • http://conroeclassof72.com/clients/d/de/de0acc14889d5d69ce6a2e221f3e79cd/File/vibizinufogusolul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=english+spoken+course+pdf+free+downloadPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE1B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f62c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF62C 16144 bytes
SHA-256: fcca37035df06e555c2991ff65faa0e8497ca6423bee408ebc46b3aef925b516
font_02_sfnt_off00010ba7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BA7 18124 bytes
SHA-256: f747488ccb01fb553c80eab6bab67c4cdea7159c1f901bcf7a7bf996a5d15f15
font_03_sfnt_off00013a26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A26 11064 bytes
SHA-256: 00afed465dab50b2e0a2adebfcb6cb29d8ead6f52f6a5e1daffce9a3d7fbe45b

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