Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddcec88a5227ec13…

MALICIOUS

PDF

69.5 KB Created: 2021-10-01 04:47:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: aa2e1d3f2d7151f8d4c73b09dc6751ac SHA-1: 20f263c5ceb8f1ca6496c927cbbf8b109e4bbb41 SHA-256: ddcec88a5227ec13e806862ae36c08686c5045437852aebe498032215f644522
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://suarezbeltran.com/aym_images/files/9983729956.pdf
    • https://ecotranslation.ca/upload/editor/file/pavaziwiwelowute.pdf
    • http://motovelo-nmsk.ru/userfiles/file/54786058694.pdf
    • http://www.malagatour.es/ckfinder/userfiles/files/zulaxezaweboninefubapu.pdf
    • http://deaprogettazioni.it/userfiles/files/65904035531.pdf
    • https://coil.hk/upload/files/pasixexisaguzo.pdf
    • http://swaptoys.org/ckeditor/uploads/files/fobixebapirike.pdf
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138e4020928a---88066037616.pdf
    • http://creativeindustries.ru/uploads/userfiles/file/lusonakurabagemi.pdf
    • https://karlholmbygg.se/UserFiles/files/nuwop.pdf
    • http://chekeeh.ir/basefile/chekeehir/files/93664931948.pdf
    • https://cryptoshift.be/anaeter_capital/siteadmin/userfiles/files/datubujiwodafo.pdf
    • https://pearproperties.in/userfiles/file/rigukirimijemilab.pdf
    • http://kronospan-mofa.hu/editor_up/86146140205.pdf
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/161561a9f67418---98423759122.pdf
    • http://pnmanagementsolutions.in/uploads/29432170229.pdf
    • http://dokumsuzgec.com/userfiles/files/96648424649.pdf
    • http://timnhanhonline.net/upload/files/28947369861.pdf
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/161431378374ad---90744337859.pdf
    • http://vijyaiprismcrm.com/userfiles/files/karirag.pdf
    • http://insightonafrica.in/userfiles/file/78014359489.pdf
    • http://gazetavk.ru/img/file/lotix.pdf
    • http://dvarenda.ru/upload/file/gemufewiforoxigikud.pdf
    • http://chanhungcorp.com/images/uploads/files/zupubugolarademivasol.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=integration+using+chain+rule
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000af76.bin
ccc68ce5f35b4a2cf6446e470470e263e6635f8466d2f625cbce4d1c5e901056		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAF76 15996 bytes
font_01_sfnt_off0000d838.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD838 16792 bytes
font_02_sfnt_off0000f04f.bin
4b916c69e667c9454c06014372d8e042d226de9bfdc78ab0d89e5a754f8e8ab7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF04F 10560 bytes

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