Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9b91d2cd7b2db92…

MALICIOUS

PDF

80.5 KB Created: 2021-09-20 21:27:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9344ce06549a45499a6d4c55f5c3a8bf SHA-1: 74e53a4690e914ec5e565c26abe5bdf668d06926 SHA-256: e9b91d2cd7b2db921b730964dcd70bc777349d5cfeae0943da00b81b1d1ac66b
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing or trojan delivery mechanism. It contains numerous links to external websites, many of which appear to be part of a link farm hosted on disposable domains or compromised CMS uploads. The presence of a QR code lure suggests an attempt to direct users to malicious sites via mobile devices.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://archism.ru/uplcv?utm_term=qr+code+beyblade+burst+xcalius+x4 PDF link annotation
    • http://7profi.net/userfiles/file/figis.pdfIn PDF document text
    • http://orthodoxvaidikasanghom.org/userfiles/file/dexuzupazerinub.pdfIn PDF document text
    • http://contua.org/userfiles/file/zawiputuzevamujuvajaw.pdfIn PDF document text
    • http://eachfun.com/ckfinder/userfiles/site_eachfun_com/files/78206156176.pdfIn PDF document text
    • http://hai-bi.com/uploads/files/202109180354337793.pdfIn PDF document text
    • http://danchrisjewelry.com/userfiles/file/pijamuzetaf.pdfIn PDF document text
    • http://a1-automotivegroup.com/upload/files/vujipadamigut.pdfIn PDF document text
    • http://papinchess.ru/userfiles/file/ligot.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ca6d292c8c---51772042992.pdfIn PDF document text
    • http://cbgnfinance.com/userfiles/file/81760262799.pdfIn PDF document text
    • http://strojsteel.cz/webpagebuilder/ckfinder/userfiles/files/40449380379.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161393c8399425---lepumokitujepimur.pdfIn PDF document text
    • https://bywuf.org/upload/editor/files/24806515458.pdfIn PDF document text
    • http://www.lebedosapartotel.com/data/yukle/files/minunavonejenabozetovidak.pdfIn PDF document text
    • http://flex-link.cn/uploadfiles/files/80417770453.pdfIn PDF document text
    • https://myshalewell.com/userfiles/file/77489939461.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/difatujupis.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/8iq7a8dvk7s9vrrft4lmpvuj1q/82612297104.pdfIn PDF document text
    • https://gangnampools.com/contents/files/91403935229.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/68858012135.pdfIn PDF document text
    • http://doanekeyes.com/userfiles/docs/patasoteli.pdfIn PDF document text
    • http://offerseir.com/basefile/offerseircom/files/90879217441.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/df63d7e501c4ecc2fff2f90963ca3516/26507546132.pdfIn PDF document text
    • http://jmlukanich.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/17609424436.pdfIn PDF document text
    • http://cellesekorea.com/ckupload/files/52282712875.pdfIn PDF document text
    • http://protezas.lt/i/File/3787868015.pdfIn PDF document text
    • http://md-servicios.com/userfiles/file/34786659713.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_off0000cda0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDA0 20304 bytes
SHA-256: 7c0b265f99192e0588590525131db15e3fb21f007fbbef73d63b569c4cc40193
font_01_sfnt_off000102b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ad0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AD0 10852 bytes
SHA-256: b2deba75e95f324044e587a5d174c2e5d96332282249574c712f58fa271ea280

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