Malicious PDF — malware analysis report

Static analysis result for SHA-256 0669b1a771fddd6f…

MALICIOUS

PDF

75.6 KB Created: 2021-09-01 10:24:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a8ae88359852721d45ae160e5a8a58d3 SHA-1: 72b64e9f509ce6e9f5ea93afd4cec19a51ed4d26 SHA-256: 0669b1a771fddd6f50735b0420241102f36a50d4403eb65d7a4338dcd64fc28a
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, directing users to multiple potentially compromised websites hosted on various domains. The PDF structure and numerous external links suggest an attempt to obscure the final malicious destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://sarigol.kr/userData/ebizro_board/file/wemuxevetuma.pdf In PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160ab8b18561ce---zapitapunogugofot.pdfIn PDF document text
    • http://aj-logistics.com/stock/userfiles/file/87680347146.pdfIn PDF document text
    • https://sitycare.com/FCK-UserFiles/files/vasapuvukajitesunen.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609cd1e43a0ce---kagofifinezagobifutiso.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/4c31d80c688652700b79d7624f723f63/wirekosimibatow.pdfIn PDF document text
    • http://klick-tipp.at/ckfinder/userfiles/publics/files/73197088112.pdfIn PDF document text
    • http://carbonelite.ru/file/37848148722.pdfIn PDF document text
    • http://nfrostov.ru/upload/files/luwewefamixugoju.pdfIn PDF document text
    • https://erdemlerkoleji.com/resimler/files/57738103720.pdfIn PDF document text
    • https://iominneapolis.com/wp-content/plugins/super-forms/uploads/php/files/73c96637695d90807cf1dbcf11541ab6/55888464462.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/9joe0eqpj1r080c7fg616g22i6/69370794649.pdfIn PDF document text
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/f5d63f420bb348681ea30fd1e85aa03a/tekiram.pdfIn PDF document text
    • http://j-line.ca/fck_upload/file/52005387122.pdfIn PDF document text
    • http://rauvuonsach.net/images/uploads/files/13256710488.pdfIn PDF document text
    • https://sportnazona.bg/f/uploads/files/jilofezupajoririjaw.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ab8c53a6d0---ginisosidamaxogux.pdfIn PDF document text
    • https://walkandsmile.com/userfiles/file/fagibozat.pdfIn PDF document text
    • http://laptopplus.be/app/webroot/files/userfiles/files/farunesu.pdfIn PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-6-16/20210616121918576942.pdfIn PDF document text
    • https://chezgregoire.fr/userfiles/matodedewegapiw.pdfIn PDF document text
    • http://hertzlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/33355697433.pdfIn PDF document text
    • http://kd-council.com/upfile/files/62093620291.pdfIn PDF document text
    • http://kielcenoca.pl/files/file/30243926442.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=life+in+a+year+soundtrackPDF 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_off0000c4e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4E2 10684 bytes
SHA-256: 7786c6078b875a78fc69797985c221dc4103c9c0f0f88b056dc6b35931825630
font_01_sfnt_off0000dd8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD8F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f5a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A1 16360 bytes
SHA-256: 2fac8a2f7459b6b9cdeb8ea74e54691a58d196a1162ff0b883ebb2f5811edefc

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