Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf669304bb577624…

MALICIOUS

PDF

84.0 KB Created: 2021-09-28 18:57:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 9c0ccf7b5838d9b7b6b0783bcd423f7e SHA-1: ca0ab7862d5015d6d617e2874215338a7e405b1f SHA-256: cf669304bb577624b96022dcd22cb944aa636cb6a9f7f548e8ebf77d15d73fb0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised WordPress sites, and others to disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall detection pattern indicate a likely phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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://inwebjor.ru/uplcv?utm_term=ssc+chemistry+book+pdf PDF link annotation
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/dpcfta3irm0rsd090itkqdso10/norafokidep.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/161331dab2ab01---42497328573.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/cbbb0523c3a4a076222f4a19b3d638fd/zogojiduvotuvivetunelov.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614823330e15f---lunimoj.pdfIn PDF document text
    • http://wolfroccatiassociati.it/userfiles/files/nomezigilovukeveman.pdfIn PDF document text
    • http://bikaji.zohukum.com/ckfinder/userfiles/files/25391832709.pdfIn PDF document text
    • https://futuresbuilder.net/dayafter/uploadimages/newsimages/file/14241490898.pdfIn PDF document text
    • http://plkorea77.com/ckupload/files/misezebaz.pdfIn PDF document text
    • https://dcimx.com/files/nesexadanoripunebiporelu.pdfIn PDF document text
    • https://cultureresortpokhara.com/assets/userfiles/files/kizetefawiduxinotosafa.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147515c4c17c---93527127864.pdfIn PDF document text
    • http://chapelguild.com/images/usr/raserazetaxewabepupubu.pdfIn PDF document text
    • http://seychelles-resort.com/images/blog/file/sulixobobijigedola.pdfIn PDF document text
    • https://nhuadailoan.vn/upload/userfiles/files/46310129532.pdfIn PDF document text
    • https://homecareangels.ca/files/files/files/jipowoguzanibilupuladag.pdfIn PDF document text
    • http://koreaseals.com/ckfinder/userfiles/files/zabugeme.pdfIn PDF document text
    • http://italiangreyhound.pl/img1/userfiles/file/24273437874.pdfIn PDF document text
    • http://jsdarvin.com/files/91648766979.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/7ec7671c44f30b8f48a860cc05b1fe9b/51329877496.pdfIn PDF document text
    • https://at1-turbo-j3t.com/contents/files/mafuwede.pdfIn PDF document text
    • http://diepdoanhmetals.com/media/ftp/file/79836088847.pdfIn PDF document text
    • https://drivetripper.com/userfiles2020/files/gofasowusinoweride.pdfIn PDF document text
    • http://delfosventures.net/userfiles/files/morikepixumel.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/161380ea85ef09---65204688246.pdfIn PDF document text
    • https://www.bramfordgc.co.uk/ckfinder/userfiles/files/wulajigurin.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bf55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF55 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d766.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD766 16616 bytes
SHA-256: 66f6ea0f71cfd3b6301408a98356788f5688c2af58aec6ef0b656913e8c6c48a
font_02_sfnt_off0000eeeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEEB 10996 bytes
SHA-256: 2c4e882dac34e3ce64313c44b7f5e824b5c0a399c16fb12d3a6e299ea38556c4
font_03_sfnt_off0001083d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1083D 22148 bytes
SHA-256: cf3608b6b213a58db818ecf1e7be25dd70939f8499e3ebf879719a58e0ad7780

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