Malicious PDF — malware analysis report

Static analysis result for SHA-256 975f3fb3089a8d54…

MALICIOUS

PDF

78.9 KB Created: 2021-07-28 04:18:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: fba78579d26d2a55f8d2f20764e3148c SHA-1: 35c362beecb1c396e06a04a0efcc9b539936abcf SHA-256: 975f3fb3089a8d54d97a38dca560c28881452df5b69fefd2bc674825ba5d5126
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised WordPress upload directories and disposable hosting. These links likely serve as lures for phishing attacks or to distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160952ae5ef271---jirumikipujoxipapa.pdf In PDF document text
    • http://www.contectrade.hu/fckfiles/file/86710300613.pdfIn PDF document text
    • http://media-production.net/admin/ckfinder/userfiles/files/39216903500.pdfIn PDF document text
    • http://springbook.no/files/jodilulaluziva.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bb56b987ab6---46156572225.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084dbce4792e---36926870453.pdfIn PDF document text
    • http://tofuyatogo.com/uploads/files/68957462317.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/b31b5e4a156568a863c77f2db3f143ab/22296756073.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/nojexetazawebevuzuni.pdfIn PDF document text
    • http://immobilieninvestors.eu/userfiles/file/89632602824.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/550c423bef075481beb6e2a1325af914/37546184757.pdfIn PDF document text
    • https://dondepodemosir.com/userfiles/file/mimizezabutofabajafo.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/sofup596jlh38otkvh3o3cn6go/gevijabovu.pdfIn PDF document text
    • http://westmont1970.com/clients/1/1d/1d0046bffbd1a03ca32bb02538d2ceaa/File/18794089237.pdfIn PDF document text
    • http://ihdbd.org/upload/files/76608932600.pdfIn PDF document text
    • https://almuhja.net/ckfinder/userfiles/files/gipupokerigenapipe.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/d7k0u1n5npd6v1rf426pcjr4lh/31410840431.pdfIn PDF document text
    • https://diphong.com/uploads/13206572524.pdfIn PDF document text
    • http://malverne69.com/clients/a/a7/a743c233813d1a1dbf5c38c484d85cdc/File/ruvubegopizet.pdfIn PDF document text
    • https://careersourceokaloosawalton.com/files/public/33603214473.pdfIn PDF document text
    • http://splhardware.com/UploadFile/file/2021072505132073499.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a5d33d881c4---49544518879.pdfIn PDF document text
    • http://hollywoodterrace.org/clients/863344/File/78510789674.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+use+one+touch+ultra2+blood+glucose+meterPDF 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_off0000cf7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF7E 11164 bytes
SHA-256: 21d0d177dbf3af7df6a49958d2f4b64f048447275477b78230a2afb5ac634f73
font_01_sfnt_off0000e949.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE949 16848 bytes
SHA-256: e4e21bef6d1d45854b791592a2a2cf127a7e8bd9e7c34d22387ebdb4708cb4f3
font_02_sfnt_off00011568.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11568 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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