Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7f8bbdd61b9b692…

MALICIOUS

PDF

83.0 KB Created: 2021-07-07 04:10:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 4244883ac68ac76ab49f4d5e77200f1b SHA-1: 797da047c2ec7c2c93e6e1d88a6ddbf7877d1456 SHA-256: c7f8bbdd61b9b692629b54ee5a63d0ca851d12422687c141a38be3fd57dbdbeb
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a large number of embedded URLs, many pointing to compromised websites or disposable domains, suggesting a link farm designed to manipulate search engine results or direct users to malicious content. The document body is largely unreadable binary data, indicating it is not intended for direct user consumption but rather as a container for these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9931

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 https://krisoc.ru/uplcv?utm_term=dil+to+pagal+hai+instrumental+mp3+song+download PDF link annotation
    • http://fitviewer.biz/files/file/zagamowudivozofibudime.pdfIn PDF document text
    • http://taiwan-casters.com/userfiles/file/397086561.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/dcf6bb2ba02fbbd8941143bf2ac8f2b2/60709494707.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160705c1933dbd---rivefemoka.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/mefuvavosekikabibon.pdfIn PDF document text
    • http://tauben-buchmeier.de/kleinberliner-schuetzen/userfiles/files/dukiful.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/tmq2l4a7l6vkf8fajf5t61vclh/76510447676.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/dc6f161cff2439ef4d53241df6501007/75288620541.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/82f0fa30afac700ffeff36ef28f8eb01/sosafopajepex.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c451871f42d---8289243549.pdfIn PDF document text
    • https://tamphuctriland.vn/upload/files/rumesako.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160b40a9f37709---vuvufose.pdfIn PDF document text
    • http://hrjok.com/uploadfile/file/22648204349.pdfIn PDF document text
    • https://viboot.com/ckfinder/userfiles/files/36667150339.pdfIn PDF document text
    • https://turismo-galicia.es/ckfinder/userfiles/files/fefubo.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a136f3ea175---zafewatitakug.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/984f65dd9a7808a691f4404513312c2e/17014105723.pdfIn PDF document text
    • http://studiolegaletrotta.eu/userfiles/files/josatoxo.pdfIn PDF document text
    • http://hncastlecable.com/d/files/gilibojipud.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/runedepej.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/dnh2q02n7q7ninte6odadc7if6/kovenisewoxexufufowesu.pdfIn PDF document text
    • http://laweasy.kr/userfiles/file/tefaverare.pdfIn PDF document text
    • http://anvlaw.com/userfiles/file/salurisinafunofoba.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c161.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC161 11200 bytes
SHA-256: 4c199b9c47f7cb5be5c2f81cc9c9eafcfffb35dd880d42392c5ad13c518946b8
font_01_sfnt_off0000db48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB48 18776 bytes
SHA-256: 3ded9aaca2ef9e6c6e95cee9882111b9cda0db582afcb602817e0619031ab472
font_02_sfnt_off0000f92e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF92E 16392 bytes
SHA-256: 85d0d581a11c1d4cd23a87cda5ab7b72032c53ccbdf48d9c04f5cd5c4dca36ca
font_03_sfnt_off000123da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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