Malicious PDF — malware analysis report

Static analysis result for SHA-256 35a0bcbbe1fb6f24…

MALICIOUS

PDF

75.1 KB Created: 2021-09-16 13:08:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 51d34ef90e0ffcf5f91d114660c11e4d SHA-1: e2413849d0f5710f931ce8a3e54adb7a46364e00 SHA-256: 35a0bcbbe1fb6f248eda29ff68bd833a4309f0af1227a306ca450bab9881c945
164 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains a large number of embedded URLs, many of which point to compromised WordPress sites or are structured as link farms with UTM parameters, suggesting an attempt to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm on disposable hosting, further supporting the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://medvor.ru/uplcv?utm_term=inderbir+singh+anatomy+7th+edition+pdf PDF link annotation
    • http://naitikfashions.com/ckfinder/userfiles/files/zagalelejakap.pdfIn PDF document text
    • http://hamzalegalservices.com/userfiles/file/27438124342.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///74143837776.pdfIn PDF document text
    • http://klwas.org/userfiles/images/file/48920392497.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135072147655---pelulavarewulubid.pdfIn PDF document text
    • http://turystyka.powiatlubartowski.pl/admin/ckfinder/userfiles/files/29533057550.pdfIn PDF document text
    • http://piazzademarini3ge.com/userfiles/files/nujoniwifuruxujavi.pdfIn PDF document text
    • http://bangdinhphucat.com/quangbasanpham/app/webroot/upload/image/files/73606997616.pdfIn PDF document text
    • https://estduquebec.com/scripts/php/xenocode/lib/ckfinder/userfiles/files/dugil.pdfIn PDF document text
    • http://snuhonors.com/userfiles/file/15900965109.pdfIn PDF document text
    • http://xatrbio.com/userfiles/file/2794229240.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/29867010586.pdfIn PDF document text
    • http://dakmet.pl/upload/petabu.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/ed068466b2546e53b565003f68140aa3/70491265847.pdfIn PDF document text
    • http://botaierpharm.com/upload/files/pikipud.pdfIn PDF document text
    • http://rw-hse-businessconsulting.de/userfiles/file/lanamon.pdfIn PDF document text
    • https://nichecnk.leaddeehub.com/userfiles/files/56848465885.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bbafcde063---xafomowol.pdfIn PDF document text
    • http://bonezi.morefriendship.com/upload/files/fezesaxubelapalexoji.pdfIn PDF document text
    • http://oreoltour.ru/sites/default/files/file/68845376804.pdfIn PDF document text
    • http://hyunsin.net/userfiles/file/31990940235.pdfIn PDF document text
    • http://metamorfozyayincilik.com/userfiles/file/fexoxagev.pdfIn PDF document text
    • http://csc-021.com/userfiles/file/20210914023428_jsntad.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_off0000c006.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC006 11156 bytes
SHA-256: e20d25990e3628660967e9423ca6ae21dfae875db43a719ef6699dc22809d0ce
font_01_sfnt_off0000d987.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD987 17600 bytes
SHA-256: 037b02aafaa6796273ee7cbf900df65225e8a005f0c216c6c0cbf4633b3aba1c
font_02_sfnt_off000106d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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