Malicious PDF — malware analysis report

Static analysis result for SHA-256 046fff75946ddb70…

MALICIOUS

PDF

78.0 KB Created: 2021-09-06 07:48:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5e5892db1b20b246efc67fed2c33d2b1 SHA-1: 4f3d12c71543e1b041521a7af6a88aed04eacc48 SHA-256: 046fff75946ddb709c213d0b4bfc297d08c812996c0884fb8fec79ea5e271926
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm or redirection mechanism. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' reinforces the interpretation that this PDF is used to distribute or redirect to malicious content. No scripts were extracted, but the overall structure and URL patterns are consistent with phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://ketchas.ru/uplcv?utm_term=500+paroles+de+sagesse+pdf+marcello+tunasi PDF link annotation
    • http://zlhk.ru/upload_picture/file/wilig.pdfIn PDF document text
    • http://valsadindustries.com/userfiles/file/77216409914.pdfIn PDF document text
    • https://steklo-shik.ru/userfiles/file/74431255795.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/vmdv5bj5hr61lvrpp0vifdoj3d/60073655720.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae10d1f740---zamezivezukufejatiz.pdfIn PDF document text
    • http://baltic-rt.ru/ckfinder/userfiles/files/xiloxukibuxajiwulojazo.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160759707a06f4---gunurovirofajimoxoripapo.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/9o5jneg60ajenb6fcp0c9b8cmj/tikiron.pdfIn PDF document text
    • http://eau-msu.ru/ckfinder/userfiles/files/63890978978.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/brtc115gr3hrkvvjsichhpsb45/xonekawig.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/873655c8d0704ffa9e86891843afa846/ditul.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/6c2bb0096249f5e0663825044c4eda5e/kirafopexoritek.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/cbf6320d228527506aec192a2905b951/mexiberufemisen.pdfIn PDF document text
    • http://simonide.org/userfiles/file/7176598677.pdfIn PDF document text
    • http://cnsgawefgl.netsociality.com/upload/files/mifevewitutoruzufesupu.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/60824606810.pdfIn PDF document text
    • http://honderhotel.com/UploadFiles/FCKeditor/20210816061038.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/37062cbb6526cc08b5d05edb4682a940/poserivorepi.pdfIn PDF document text
    • https://egca.fr/userfiles/file/jokinigix.pdfIn PDF document text
    • https://hbfilm.ca/resimler/files/60515636889.pdfIn PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/76781531077.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b883bb382a4---zexexanirotozafakalepuso.pdfIn PDF document text
    • http://assessmentinsight.com/ckfinder/userfiles/files/kaxovemixi.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd2741d5d1b---38750139809.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9fd9c78f2---wuxiviwugufuze.pdfIn PDF document text
    • http://ssujaxchapter.com/clients/83257/File/83567667786.pdfIn PDF document text
    • http://jarosi.hu/files/file/7474877570.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_off0000c765.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC765 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF77 18716 bytes
SHA-256: 793d0ad6ab442040ad8fdd9309fcf6f6cdcc50d865ac787690fee4aaeafebbf1
font_02_sfnt_off00010e54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E54 11224 bytes
SHA-256: 21802db381a663120e2708652653dcf56b9eecbc82fe460043780141cc98b148

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