Malicious PDF — malware analysis report

Static analysis result for SHA-256 446cc0159348c5bd…

MALICIOUS

PDF

89.8 KB Created: 2021-08-14 00:03:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8ce9facc3f74782480c0239f2400d9d3 SHA-1: 6c4dc24ae65b96d127fe2c28a4148d1161b66bce SHA-256: 446cc0159348c5bd2b97e3b39cbbe993837d5ee3a4cbf789c2050f47f9b325c0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites used for hosting. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a pattern of using disposable or compromised hosting for link farms, likely to obscure the final destination or evade detection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/bc89a14ed5f1d6bf7b9fdd860cd30eb5/xavobom.pdf In PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16070996bf1ea6---borojitifaku.pdfIn PDF document text
    • https://hunghiephuylog.com/upload/files/54656011677.pdfIn PDF document text
    • https://keluargamimpi.com/contents//files/muwobazexuxoxutab.pdfIn PDF document text
    • http://fleshlight-tw.com/userfiles/file/dosewareronoxinonog.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/gobivogib.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/9091994786.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160a92ac7e4464---wetijarasodukinuneruded.pdfIn PDF document text
    • http://webs123.com/userfiles/file/75859588081.pdfIn PDF document text
    • https://mbzl-pro.xyz/web/img/podborky/files/wopiselusowigilevuwi.pdfIn PDF document text
    • http://4bx.pl/public/file/55552535702.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/suvudunukizefalikofazako.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/dde1d44b6d4bdc15cf147cd5a0f705e9/82196588715.pdfIn PDF document text
    • https://gadd-asso.org/userfiles/file/kesuxenemutetusa.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/cd3b567ea00284ff4bdbad41c2031621/18694500858.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0476786ba---16135386824.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a98d4c91538---zafabigavazewudo.pdfIn PDF document text
    • http://cristal-in.fr/userfiles/file/monanaminili.pdfIn PDF document text
    • http://www.biotanika.pl/upload/file/49401716264.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160823a4163f26---dilaxexamu.pdfIn PDF document text
    • https://nmcs.ca/userfiles/files/71306285121.pdfIn PDF document text
    • http://superpart.com/files/bipavozosejowerotexone.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/figebuvogotumop.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a848c12a35c---zotezituxawonatanifon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+weld+pipe+with+argonPDF 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_off0000fc16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC16 10580 bytes
SHA-256: 80dc9dc688a25b383a5926bc46c3b38478306e37689cd69a75af6c420a433d19
font_01_sfnt_off000113ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113EC 16980 bytes
SHA-256: 61a1304ff95b84351034b3bd019b589baae10122025c14cb96e71fd5d62d4e3e
font_02_sfnt_off0001404f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1404F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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