Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad51d052bb5056b6…

MALICIOUS

PDF

87.4 KB Created: 2021-08-07 03:51:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: a5b8b028819701badfe69c65b77b4744 SHA-1: 00d686e583e0ec3a20304422f3ae92699c0ade02 SHA-256: ad51d052bb5056b64e0076bd73ea708ffb933a1544f3d45f4999123b2afc1a08
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

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://smidgel.ru/uplcv?utm_term=five+nights+at+freddy%27s+sl+free+apk PDF link annotation
    • http://rothemtour.com/FileData/ckfinder/files/20210801_0941EE83C0D3D541.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/7bca7f6e5f5f2bb5748c088900b8cd35/37652294952.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/9f8ggva07bbj471kpm162c5pm5/49550368649.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/a2cc8912fb6fcc65e4ceb5fd905444b8/xojodesojemud.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/08d51d5610f391306eed9cb9810546f1/naxomonixirajipenuvexe.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609d4a0a83156---27865198522.pdfIn PDF document text
    • http://medica-eg.com/userfiles/file/88477288926.pdfIn PDF document text
    • https://hideab.se/tc/Mediagalleri/file/5925227629.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae72ffb2914---baderevudubepenaliko.pdfIn PDF document text
    • https://www.liftechforklifts.com.au/application/third_party/ckfinder/userfiles/files/24414650579.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072be76da621---68314159248.pdfIn PDF document text
    • http://gpkoaee.ru/ckfinder/userfiles/files/bazipovonatu.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608437fd71a02---60059730249.pdfIn PDF document text
    • https://gulf-rope.com/images/bulk_images/files/20457158420.pdfIn PDF document text
    • https://sahyadrisevasanstha.in/userfiles/file/kuwixiwiputojelu.pdfIn PDF document text
    • http://phuquytravel.com/nguyenvanlinh/files/rorivozupixekopabajetuk.pdfIn PDF document text
    • https://autoroman-service.ro/imagini_ws/14498084039.pdfIn PDF document text
    • https://gym-rectif.fr/ckfinder/userfiles/files/tedajasutelet.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/df6932056c32efcdeab6c88a1d6bce78/55664892296.pdfIn PDF document text
    • http://aroma-es.site/yamituki-n/uploads/files/62385885631.pdfIn PDF document text
    • http://szyldkj.com/luodan/images/userfiles/file/88440036642.pdfIn PDF document text
    • http://www.aqsclimited.com/EditorImages/file/zotiwekeled.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_off0000f099.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF099 10940 bytes
SHA-256: e857f472a72411482fb970f431be45b8f9921c9832e38d8ebd84a48a16b74c46
font_01_sfnt_off000109b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109B6 17068 bytes
SHA-256: e1737c831c54ce01852cacfe428108e729ddad52ff7e3f267812568b4973c4b1
font_02_sfnt_off00013650.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13650 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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