Malicious PDF — malware analysis report

Static analysis result for SHA-256 c142a1b1b23d5fee…

MALICIOUS

PDF

83.7 KB Created: 2021-09-25 16:13:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 217148d65ec846131cbe85f550658ce1 SHA-1: a3b6d245820413ab5e652398766c27fcae4cfcc1 SHA-256: c142a1b1b23d5feedf77bff8bcd33c93337edae0bf479dd2a7854b3ac7af92f0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to distribute malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics, along with the ClamAV detection as Pdf.Phishing.Trojan, indicates a phishing or malware distribution attempt. The embedded URLs and the ML classifier's high confidence score further support this assessment.

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 http://hhoasis.org/app/webroot/img/fck/file/xelud.pdf In PDF document text
    • http://kaies.net/upfiles/file/67335806362.pdfIn PDF document text
    • http://373113.linker.tw/files/fofilule.pdfIn PDF document text
    • https://samirkumarpaul.com/ckfinder/userfiles/files/jaxixodiwijuler.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/3a24d339747b786a0140a30bc27325ce/12736232365.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c407db93d2---simajoloropexeser.pdfIn PDF document text
    • https://dianthusindustrial.com/resimler/files/59756828089.pdfIn PDF document text
    • http://michellenevinracing.com/FCKeditor/file/nejofazogawo.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/futukafabazagogoj.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/rn4etsgh5j66hlgs7rmeei1bv9/49222391208.pdfIn PDF document text
    • http://topenglish.sk/app/webroot/gallery/files/19734766222.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/7c5e19fb5154d41ca4f6ed85a9910a8f/vudido.pdfIn PDF document text
    • http://orderkai.com/uploads/files/samikibomogomojokasowul.pdfIn PDF document text
    • https://www.alapan.org/fckimages/file/37167723372.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/31099412305.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1614e248ced6ec---davegabowo.pdfIn PDF document text
    • http://eatatrudy.com/uploads/files/fotunuf.pdfIn PDF document text
    • http://ekosertifikat.uznature.uz/userfiles/file/42206458029.pdfIn PDF document text
    • http://poney-club-romilly-aigre28.fr/userfiles/file/22014446387.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/88e9to0injfejj2ncfpp2mt2mu/83329235236.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614897a43eabc---87581861472.pdfIn PDF document text
    • http://studiodugnani.it/userfiles/files/44743787801.pdfIn PDF document text
    • https://www.tamilsaga.com/ckfinder/userfiles/files/33812649087.pdfIn PDF document text
    • http://nriloan.jctoursandtravels.in/files/tasunozirowimog.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1614e8edc6021c---jakarujedonawatawadoguma.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=unlock+pdf+offlinePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c4e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4E8 16232 bytes
SHA-256: 01cd0e4798e93fb086042d610f43ddeed7bf091af48aa863f5c4a4f61b651684
font_01_sfnt_off0000dac2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC2 10184 bytes
SHA-256: 0af4370a0e9b133ddeb8387a56c279412d85719c7acb46e0ae790ddfffce04a8
font_02_sfnt_off0000f19a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF19A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000109ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109AC 20872 bytes
SHA-256: 723d47bb13185cfd7c93231e9c5383a7cf711a393fcbee8ce71d8f5f19de15d1

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