Malicious PDF — malware analysis report

Static analysis result for SHA-256 898a841db6909b4f…

MALICIOUS

PDF

71.0 KB Created: 2021-09-20 09:25:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 86caf0ef4f279dd209ac1c4d9782bf85 SHA-1: e983567d14fb17e93d38e950998b6c5d6ee5e63b SHA-256: 898a841db6909b4f121ee2d4330edfbfc99486fbb10c4d24417d9fa7b0599ba3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this is a phishing or malware distribution lure. The ML classifier and ClamAV detection further confirm its malicious nature.

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://nomylo.ru/uplcv?utm_term=mario+3ds+roms PDF link annotation
    • https://ms02bet.com/contents/files/sonoxulenumowizedo.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/wegaligezetenesiwolone.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/kivewujuw.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ed7bf18a1c---fefabumariwexejexuwixe.pdfIn PDF document text
    • http://freetourscadiz.com/ckfinder/userfiles/files/25675342218.pdfIn PDF document text
    • http://autothudo.vn/upload/fck/file/6630860437.pdfIn PDF document text
    • https://intersensor.ro/v2011/Files/fck_upload/file/newerojuxifosililabu.pdfIn PDF document text
    • http://theexplorerthai.com/userfiles/files/vibetululofakalur.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613d0c14934d9---33796906632.pdfIn PDF document text
    • http://kangmeideyiliao.com/uploadfile/file///2021090708335320.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/nasufozaruw.pdfIn PDF document text
    • https://villanakarin.com/userfiles/files/lepiruzuvajepetogosusax.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/c96a78c03b5adba1cbedfabdec2fe955/novipi.pdfIn PDF document text
    • http://geriatriccarenewjersey.com/userfiles/files/71426214639.pdfIn PDF document text
    • http://xsteelstock.com/d/files/1036870917.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/dc251bb74d8b232c31788fe6abf90762/gafozed.pdfIn PDF document text
    • https://taiwancy.com/app/webroot/userfiles/files/vonogonawusorovukepil.pdfIn PDF document text
    • https://0922.sproname.com/files/userfiles/files/wekikezerot.pdfIn PDF document text
    • http://zeguvietnam.com/uploads/ckfinder/files/tokawuwanaladoxelumila.pdfIn PDF document text
    • http://vaness-sens.fr/ckfinder/userfiles/files/87513729742.pdfIn PDF document text
    • https://trompis-tondschungel.de/userfiles/file/50532528255.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613f9442dbb17---noleminiparipulizidawa.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/kknu4c23j89hmr9pnmn2vldean/27961667501.pdfIn PDF document text
    • http://ever-pioneer.com/upload/files/gujafazemalebomoxeje.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_off0000b8fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8FC 15164 bytes
SHA-256: 04ab2da6c2f0355d414d1ba916dd6576140da7d6366d67e862c2f0906f285bff
font_01_sfnt_off0000df36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF36 10192 bytes
SHA-256: 92eaf7454885faf35225fcc3ca350bb66062b2c3235b9968009d70ef5c0bb3a4
font_02_sfnt_off0000f60c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF60C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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