Malicious PDF — malware analysis report

Static analysis result for SHA-256 88c065067da4912c…

MALICIOUS

PDF

70.4 KB Created: 2021-09-29 06:32:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e3008b7bf5e3e8072669b3b335c189b0 SHA-1: 60cb6e1f4fc47cb921bf9caeaf3170a56c9a46ee SHA-256: 88c065067da4912c914190ff720ce05f628348f97dfa0ad566e1d854ead36473
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and URL distribution suggest a phishing or malware distribution attempt.

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 https://zoldlaptop.hu/ckfinder/userfiles/files/jurikokaporifovixakefuwon.pdf In PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/d4ad77b5f0e1433f304bb17321e576f4/munoja.pdfIn PDF document text
    • https://novinfasteners.com/userfiles/file/79088301889.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133b6e41ab17---zakadenuwidolasabutitebek.pdfIn PDF document text
    • http://afro-safari.com/upload/files/kekegibumoxad.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/75092322259.pdfIn PDF document text
    • https://domilot.com/uploader/files/20431660617.pdfIn PDF document text
    • http://arqing.es/ckfinder/userfiles/files/42947886850.pdfIn PDF document text
    • http://leeclinic.kr/userData/board/file/15292482645.pdfIn PDF document text
    • http://scouttautomotive.com/editor_uploads/system/files/jiwigejasepitewenukaz.pdfIn PDF document text
    • http://aimic.com/userfiles/file/74249684744.pdfIn PDF document text
    • http://sbstroy53.ru/img/files/luvawarowereliziwo.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/8c515c34b9a867a26d9ff7e067047b2d/nojagixalonuposunas.pdfIn PDF document text
    • https://nevisnews.com/userfiles/14776414210.pdfIn PDF document text
    • https://electrodomesticaruano.com/images/ckfinder/files/pazeni.pdfIn PDF document text
    • http://andersonlawdecorah.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/8180487947.pdfIn PDF document text
    • http://insei.eu/userfiles/files/49128011974.pdfIn PDF document text
    • http://moestuinwebshop.nl/userfiles/file/12581452941.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137bef977741---lidagedosafijawusokosoxe.pdfIn PDF document text
    • http://a1-automotivegroup.com/upload/files/vawixuzuvufati.pdfIn PDF document text
    • http://ezclasssites.com/var/wwww/dev-ezclasssites-com/data/files/taporasefen.pdfIn PDF document text
    • https://anup.bo/images/files/noxalivarorekaz.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/91880691895.pdfIn PDF document text
    • http://italianopizzeria-pg.com/uploads/files/98429913499.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=adblock+celular+chromePDF 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_off0000b1b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c9c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9C7 16832 bytes
SHA-256: e0937ca7551dfa1f79f5e9b32d4da78758f0c2055a4f16f53ad3b4e3e5842ad7
font_02_sfnt_off0000f49d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF49D 10484 bytes
SHA-256: de3c2ee6233be68a1eed9666a8c8bb1e0e7edf2c98c916ac9668ca420bdb7b1f

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