Malicious PDF — malware analysis report

Static analysis result for SHA-256 c151a82a9561f235…

MALICIOUS

PDF

78.3 KB Created: 2021-09-11 03:47:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3afa0d189818e253ce6d2392800609d0 SHA-1: b57faafeb8fb65ef10371debcd75dde31796a935 SHA-256: c151a82a9561f2359a0edc2e7ae6665c2a784ec34720a0aff08a6bcaf8d20d65
156 Risk Score

Malware Insights

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

The sample is a PDF document identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It functions as a link farm, containing numerous embedded URLs pointing to various domains, some of which are hosted on compromised CMS uploads or disposable hosting. These links likely lead to phishing pages or further malware downloads, indicating a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://goldenstarhotel.vn/images/uploads/files/sumuvuwipej.pdf In PDF document text
    • http://miass.realxenon.ru/uploads/files/77633747399.pdfIn PDF document text
    • https://psiakocky-potisk.cz/webpagebuilder/ckfinder/userfiles/files/zazemujobiki.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/7705eb7b11cd231a1d816d6783ece22f/57061781566.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16137eca891deb---73922552515.pdfIn PDF document text
    • https://inprovitmexico.com/ckfinder/userfiles/files/kegajobidite.pdfIn PDF document text
    • https://doucetplasticsurgery.com/ckfinder/userfiles/files/89955059485.pdfIn PDF document text
    • http://wittymall.com/multimedia/userfiles/file/34153658325.pdfIn PDF document text
    • https://postelezmasivu-zlin.cz/ckfinder/userfiles/files/rogexitules.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/16139df686615d---suvexibaxusu.pdfIn PDF document text
    • http://dungcumaymoc.com/Images_upload/files/fidefewaxisezepepezo.pdfIn PDF document text
    • http://olech-rzeszow.pl/userfiles/file/41206323596.pdfIn PDF document text
    • https://sreekanakananda.com/ckfinder/userfiles/files/niwamijinipuvapibes.pdfIn PDF document text
    • http://stonepigments.com/userfiles/file/46668758821.pdfIn PDF document text
    • http://bowenlawmt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/38271737577.pdfIn PDF document text
    • http://elitvorota.ru/f/file/81260208717.pdfIn PDF document text
    • https://capital-publishing.com/ckfinder/userfiles/files/zowutovezuzosapak.pdfIn PDF document text
    • http://terwaarde.be/ckfinder/userfiles/files/46877544097.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/c800a44aab8f635fde838bfacc9f1564/28624530598.pdfIn PDF document text
    • https://watosaphotography.com/app/webroot/userfiles/files/20210902_030047.pdfIn PDF document text
    • http://arkystudio.eu/userfiles/files/punobomoxa.pdfIn PDF document text
    • http://only-svet.ru/upload/files/80136496705.pdfIn PDF document text
    • http://peggylittlelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/66705481495.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=android+license+plate+recognitionPDF 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_off0000c475.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC475 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC87 20480 bytes
SHA-256: 17f84b6cb2b7be084f0c17e195d54d22d27497cb2392fff08809dbb4ce96c8c6
font_02_sfnt_off000112f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112F9 10672 bytes
SHA-256: 74201cd72fd6e06c243e67a675546a6ddc2f2b8c12f0bf7dcd7e3f2455c1f555

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