Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2d690aab0319c80…

MALICIOUS

PDF

84.9 KB Created: 2021-09-21 06:53:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 60c334ddf7c45312227bbdf03b648827 SHA-1: 6a88426caada12d82c019f8643619aed40c59f39 SHA-256: e2d690aab0319c80177feba82a9dee0f6d99dafc610ada9dc0b9f38efac09f00
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to various domains, many of which appear to be compromised CMS uploads. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of numerous unknown URLs suggest a phishing or malware distribution attempt. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://suliaox.com/v15/Upload/file/2021911954286794.pdf In PDF document text
    • http://bischofs-scheune.de/userfiles/file/94275491704.pdfIn PDF document text
    • http://lrm.mcdonalds.ua/ckfinder/userfiles/files/53476924868.pdfIn PDF document text
    • http://antonioruizabogados.es/userfiles/file/61269420048.pdfIn PDF document text
    • https://wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/47723843440.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc6063675e---soxetibizor.pdfIn PDF document text
    • http://celyroknaterase.sk/editor_uploads/system/files/41944516888.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/08b945d83c04ce09fea908acfe40e0c5/66788706818.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/53fa5e4e4bad352bea125485890aa2e9/99436625718.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/161489ad686237---kojetusikafuxezasilexojaj.pdfIn PDF document text
    • http://weighlessthisyear.com/ckfinder/userfiles/files/54336491700.pdfIn PDF document text
    • http://1night2day.com/ckupload/files/38136761158.pdfIn PDF document text
    • http://aybar-gallery.com/userfiles/files/71283806469.pdfIn PDF document text
    • https://careerroots.net/ckfinder/userfiles/files/37268206787.pdfIn PDF document text
    • http://sungder.com/upload/dakuvokureteguv.pdfIn PDF document text
    • https://k-barrierfree.com/FileData/ckfinder/files/20210918_E4F20D40356F2E06.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/d03e5ca98777b12b1e3de31fdfb38b99/12229739380.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/qictrpegjdj3ihsvk0duv4valu/bomosepilutod.pdfIn PDF document text
    • https://karpzbeldowa.pl/uploads/userfiles/files/remikabirurusevugakira.pdfIn PDF document text
    • http://ssteelelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/35589319659.pdfIn PDF document text
    • https://emmaushuis.org/pages/wigujebiruluzitu.pdfIn PDF document text
    • http://kaus21.com/userData/board/file/sumupivusomusawiga.pdfIn PDF document text
    • https://chilepools.com/contents/files/rulijazivovibim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=download+original+stock+romPDF 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_off0000e673.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE673 17840 bytes
SHA-256: e05e039b05d5614fbbaffc02c077d508aeb10a6896559ad320528bd8f3cf5065
font_01_sfnt_off0001154b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1154B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D62 10760 bytes
SHA-256: d22f2ac88e38b1cfa04a9a445b4b6dd1f151c45d9a76d05bb795317f2d0d30b3

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