Malicious PDF — malware analysis report

Static analysis result for SHA-256 8242fd9fe4c29754…

MALICIOUS

PDF

92.5 KB Created: 2021-09-20 01:16:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c10abb7cfe98eeb061b8ec094204347f SHA-1: 77dd07b977fd194ed6929484d5540b6a6011ac73 SHA-256: 8242fd9fe4c297541ed965d1db11860a0f3e637d2e8ef62409e19ec61d9033d0
156 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to redirect users to potentially harmful content. The presence of multiple PDF link farm heuristics further supports this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://philabc.ru/uplcv?utm_term=que+emulador+de+android+para+pc+me+recomiendan PDF link annotation
    • http://kipia-nn.ru/userfiles/file/gusurotagezexesibabenab.pdfIn PDF document text
    • https://piphoto.tw/uploads/files/202109100730549473.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1614161e81fb1e---dagowogunifu.pdfIn PDF document text
    • https://mk-promotions.com/ckfinder/userfiles/files/mirafozemuxuxoxovekas.pdfIn PDF document text
    • http://kant21.com/userData/board/file/fabisapejakusurajaj.pdfIn PDF document text
    • https://jagamimpi.com/contents/files/54878685796.pdfIn PDF document text
    • http://lishasurgical.in/ckeditor/ckfinder/userfiles/files/92577002734.pdfIn PDF document text
    • http://xn--80affcyoc0ac1f6a.xn--p1ai/admin/modules/ckeditor/ckfinder/userfiles/files/zenivixafepaf.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/16137eb6701477---92958868428.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/borirebekikuvewen.pdfIn PDF document text
    • https://5ky13lu3-1251.com/contents/files/manimovepa.pdfIn PDF document text
    • http://professional-tuner.at/uploaded/file/buvomimaxanojebawidivum.pdfIn PDF document text
    • https://www.confirmedtour.com/files/rexiperafotigijoz.pdfIn PDF document text
    • http://thewellmanteam.com/userfiles/files/pejefabazoxodonatadawuz.pdfIn PDF document text
    • http://veterinariomauracotti.it/userfiles/files/paxunofuvetokimoketamawon.pdfIn PDF document text
    • https://searches.onlineconvey.com/userfiles/file/97822444088.pdfIn PDF document text
    • http://dharkaninternational.com/survey/userfiles/files/palodaxeziwara.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/53239520911.pdfIn PDF document text
    • http://fruitsad.pl/images/file/85479611191.pdfIn PDF document text
    • http://plechotice.sk/tmp/file/39854593168.pdfIn PDF document text
    • https://viscom.bg/uploads/wysiwyg/files/25767818482.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/161352eedebe49---wemebubugusune.pdfIn PDF document text
    • http://www.afurg.com.br/assets/ckfinder/userfiles/files/gizobunarowomezufiku.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_off000100fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011912.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11912 10568 bytes
SHA-256: 0631147fe8f08cdd21404d24dcbb6fb61e4bce5a8f768e3ee3fc1ee76d292769
font_02_sfnt_off0001311a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1311A 19356 bytes
SHA-256: 8d2803b47d55b94d4db90991c419fecfd579b171318a3d75bffe0ffca5fb7e44

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