Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f0a60d8cba2d147…

MALICIOUS

PDF

83.8 KB Created: 2021-09-01 03:00:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2dbed0f5f2080f425e10ad8665009ad0 SHA-1: af09ed462feb58178bc3634dfa39a58c3e893c56 SHA-256: 8f0a60d8cba2d1472557392b97c8603d34cf7193710311de1677b8428ec46955
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 a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to potentially compromised websites. The presence of multiple links on disposable hosting and compromised CMS upload storage suggests an attempt to distribute malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://maradonasalud.com.ar/ckeditor/ckfinder/userfiles/files/vodapivazumuguvogup.pdf In PDF document text
    • https://lesura.net/userfiles/file/94073240699.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160967b46934a5---sutadazepomisagibakefox.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1611a603a4ac30---30665983780.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/bidifupaja.pdfIn PDF document text
    • https://conexkarvan.com/cache/fck_files/file/92740081450.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16123a9a982863---90547424983.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/rinukofijubufexiguwamakiw.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/105a56b38017fedac398ff487c9a1e46/voxirekojoje.pdfIn PDF document text
    • http://marsalanoleggio.it/userfiles/files/fonurisugusixede.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eceb4d87b0---bafiw.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/1629a9bfa9c13132c103291de748414c/33886956073.pdfIn PDF document text
    • http://www.physedu.in/newsite/userfiles/files/monazonalek.pdfIn PDF document text
    • https://kemxoi.vn/app/webroot/files/images/pages/files/zijatumi.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/5979f23614891b2518e702ee54058b6d/wadomututajeruxi.pdfIn PDF document text
    • http://writtenmail.com/upload_images/file/93960991708.pdfIn PDF document text
    • http://51-lq.com/userfiles/file///rinaronofelevatipinubi.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/85098281958.pdfIn PDF document text
    • https://usssecuritate.ro/userfiles/file/17537895623.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/ccbb02ee73a14307476aa66795571fab/vesifekudumibefofamalit.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/38pactvralfl1ulgk8kc1mgqbj/xawavadufegawofexedisime.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/4485672298.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=mickey+mouse+space+adventure+coloring+pagesPDF 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_off0000e1b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B2 11220 bytes
SHA-256: c004e57723e972411a989b8da3f167c1835cce4912e8f441993c32d182c59b51
font_01_sfnt_off0000fbd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD6 17348 bytes
SHA-256: 76b8b0232b21f0ef28a1f1c17b587238c043314265369c01b2bf2f0d17b507f3
font_02_sfnt_off000128b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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