Malicious PDF — malware analysis report

Static analysis result for SHA-256 afa476ab63d13f80…

MALICIOUS

PDF

94.5 KB Created: 2021-09-11 05:54:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 63d174235442b70e5201f7e0be6e1f37 SHA-1: 751c346407906fc63db5bd2be08b91dcc7b84c14 SHA-256: afa476ab63d13f80751cd9b154211410ead0af2866fe3ff927550ff34018e218
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating it likely exploits a vulnerability or contains malicious content. The file functions as a link farm, with numerous embedded URLs pointing to various domains, some of which are hosted on compromised CMS platforms. The primary purpose appears to be directing users to external resources, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://suliaok.com/v15/Upload/file/2021931352266334.pdf In PDF document text
    • http://otevrel.eu/ckfinder/userfiles/files/xuxepe.pdfIn PDF document text
    • http://ct-tci.com/cttax/userfiles/files/xiwupa.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132caa709985---xaperuwamokofedezetu.pdfIn PDF document text
    • https://demo-calson.garment-pro.com/ckfinder/userfiles/files/2162477618.pdfIn PDF document text
    • http://kbidc.kr/upload/editor/file/1631360657.pdfIn PDF document text
    • https://karpzbeldowa.pl/uploads/userfiles/files/50483428446.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/8eebcb754f0c6b18b395539ed8de7717/95947851928.pdfIn PDF document text
    • https://mekongtransport.com/upload/userfiles/files/weruze.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/e245b1d1b869d924c5030b167e3db5df/nifip.pdfIn PDF document text
    • http://www.salpasafarit.fi/tiedostot/files/savudijurunurikosodafel.pdfIn PDF document text
    • https://kildevangen.dk/files/sizimaregufamid.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161378041ea891---23818211771.pdfIn PDF document text
    • https://cultureresortpokhara.com/assets/userfiles/files/puxufimiponimagef.pdfIn PDF document text
    • https://senarathgroup.lk/assets/media/file/xikomojovuwajuzigaj.pdfIn PDF document text
    • http://gemmacapitalgroup.com/foto/file/40128569527.pdfIn PDF document text
    • http://intertribo.sk/files/siturodukelirisalifo.pdfIn PDF document text
    • http://caramelitos.sk/files/24064743886.pdfIn PDF document text
    • http://sxhk365.com/uploads/file///pibamofuvo.pdfIn PDF document text
    • https://yomadesign.com/userfiles/Proj_Name/files/palow.pdfIn PDF document text
    • http://dpnovelty.com/upload/files/34521659066.pdfIn PDF document text
    • http://lagunaapartman.hu/images/user/file/fizonenizi.pdfIn PDF document text
    • https://nyig.com/files/file/43781789480.pdfIn PDF document text
    • http://mitcostruttori.it/userfiles/files/72228732888.pdfIn PDF document text
    • http://knipia.com/userfiles/file/59404506335.pdfIn PDF document text
    • http://tw-sincere.com/upfiles/editor/files/lanerorid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=grey%27s+anatomy+season+17+episode+1+watch+online+putlockerPDF 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_off00010973.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10973 18296 bytes
SHA-256: 821264b0c0ce1aa888638cca18c20b33a9f2c06392c39b9cd9ef2ae9d0d26ab5
font_01_sfnt_off000138bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000150d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150D6 11348 bytes
SHA-256: 46a80a3043759d1d7af0ffbe997bd445b41567a9856d469bd93e6ba8ed3be26b

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