Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0a803b10e606e22…

MALICIOUS

PDF

81.5 KB Created: 2021-09-20 19:28:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3e5cf3da543b31133a35636e0ec3557d SHA-1: 711a5684df4615234ca645b16077b7f275dc7daa SHA-256: a0a803b10e606e22970301dd534416bbdc2ae81c63f5e74c84022dbb785f408b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious Link

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It functions as a link farm, containing numerous URLs that point to various external sites, including those hosted on compromised WordPress installations. The presence of 'utm_term' parameters in some URLs suggests an attempt to track user engagement or disguise the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://cructi.ru/uplcv?utm_term=photo+editor+polarr+download PDF link annotation
    • https://icnj.net/ckeditor/ckfinder/userfiles/files/12230502338.pdfIn PDF document text
    • https://shindah.com/images/ckeditor_img/files/wuwaduzodeve.pdfIn PDF document text
    • http://thomasgearon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kurasal.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/47185e4861c3b69804ed9fe9a674d212/fufinatebi.pdfIn PDF document text
    • https://pyccenter.com/images/Upload/file/33458850584.pdfIn PDF document text
    • https://hoavily.com/uploads/files/ziduzijamibusomigidebil.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/xopesag.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147452bc876f---97010477671.pdfIn PDF document text
    • http://metrominicabs.com/survey/userfiles/files/60307604850.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/280a569db67736dfb2b5aef9daba6c50/jetodagosalimajotubikosov.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff804ab466---66942508567.pdfIn PDF document text
    • http://svatba-emi.com/uploads/pages/files/rebexedovigokem.pdfIn PDF document text
    • https://immsac.pe/sgi_userfiles/userfiles/files/27150298175.pdfIn PDF document text
    • http://zulassung4you.de/bilder/file/vejilulimagew.pdfIn PDF document text
    • http://kaithompson.com/userfiles/file/38001528757.pdfIn PDF document text
    • http://longruiglass.com/ckfinder/userfiles/files/20210912_141552.pdfIn PDF document text
    • https://edinburghpools.com/contents/files/jazofixipalupo.pdfIn PDF document text
    • https://masihpt1.com/contents/files/zepebixakizako.pdfIn PDF document text
    • http://mrpennarak.com/user_file/file/fotifuvidadekokujabud.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/161417a34cc099---nivikuxunubujawu.pdfIn PDF document text
    • http://forumcutuca.com/ckfinder/userfiles/files/panonotuxomut.pdfIn PDF document text
    • http://bioscipublisher.com/files/upfiles/file/tupojadulogigu.pdfIn PDF document text
    • https://perkunasstudio.com/uploads/files/202109052349264968.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-9-20/20210920135841252008.pdfIn PDF document text
    • https://flims.atelierleuthold.ch/userfiles/files/61865185104.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_off0000dbd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBD3 10408 bytes
SHA-256: 794fdb44ad4eab85133bb5643e9a64c9bdadeab959c860d483789f273a5fc9f5
font_01_sfnt_off0000f359.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF359 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B6B 17508 bytes
SHA-256: 141e25fdbf466ae034fcbad72ad8863ec3281bc14a4c440ac07949d4c28fce91

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