Malicious PDF — malware analysis report

Static analysis result for SHA-256 86fc9228784c6ceb…

MALICIOUS

PDF

89.2 KB Created: 2021-07-04 23:10:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c673592ddbc608f875a5dfd555d4ebf5 SHA-1: 53e26f2b1535cc989b01154f08a65fbba5fbf0b3 SHA-256: 86fc9228784c6ceb4e6ea1c82e4a0f622fbb5f66eb5ff8c2003934b7500fce81
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan delivery mechanism. It functions as a link farm, with numerous URLs pointing to compromised CMS uploads, likely intended to host and distribute further malicious content. The PDF itself does not contain readable content, suggesting its primary purpose is to redirect users to these external, malicious resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b53698249---72238382572.pdf In PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/dp4n2937700r0qplhsek1oebm1/83862224098.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160803d122d480---salijijiwupujaralaraka.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/35614e5b6e8e42e16bc2c4ff4df1460f/kedojuxupofunesaxot.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021051921080583.pdfIn PDF document text
    • https://jordan.si/dokumenti/file/kizumor.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c64b000e795---siveliketijupe.pdfIn PDF document text
    • https://cornerstonelaw.eu/userfiles//file/xikawukigasixoja.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608068d76f2c7---lixesanoratefepuda.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160cb988fe289b---zuzozokuxirosusodivadabet.pdfIn PDF document text
    • http://harasim.cz/uploaded/files/kogikonudidebif.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609fb70dccd9b---vutudakud.pdfIn PDF document text
    • http://iltorg.ru/upload/file/16676699403.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608adb35208f0---wotubuteruvodudefabikowog.pdfIn PDF document text
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/64242338758.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/66625368744.pdfIn PDF document text
    • http://ayurvedicclinic.org/userfiles/file/97462117230.pdfIn PDF document text
    • https://aashianarealty.com/file/86880853757.pdfIn PDF document text
    • https://novamakine.com/upload/ckfinder/files/874713096.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607149b216032---27342619387.pdfIn PDF document text
    • http://winfielddeli.com/ckfinder/userfiles/files/51546807295.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/17218701363.pdfIn PDF document text
    • https://ratsimae.eemedia/contents/file/vijatuvowotubilol.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608698d7e4c8a---5593501822.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc33a782d2---tawekorugojotevanaxa.pdfIn PDF document text
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a244be6a170---93786707237.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=physics+crossword+puzzle+answer+keyPDF 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_off0000f802.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF802 10968 bytes
SHA-256: ec81e35d20b4c48e312cc9ad339981196f803181199d24a3b06fd26ba97bb8ac
font_01_sfnt_off0001117e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1117E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012990.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12990 17432 bytes
SHA-256: 04aa62ea3632c94ba084b54f21c0e5ad99264afe71260621d2cf620c55842389

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