Malicious PDF — malware analysis report

Static analysis result for SHA-256 c825dcb8a6ca5d93…

MALICIOUS

PDF

86.7 KB Created: 2021-09-11 16:04:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8b0c478a0c0d040729e501930a206af4 SHA-1: e06193b83dd0a9feb58a543fc2c550aa5338f092 SHA-256: c825dcb8a6ca5d93a9c87cda80b2d7140ef94cb3590afd67fbb0e99cfce55a24
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and ML classifiers, indicating a high likelihood of malicious intent. The file contains embedded JavaScript and numerous URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm. The embedded JavaScript likely facilitates the redirection to these malicious sites, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://oecschool.com/userfiles/file/supogufe.pdf In PDF document text
    • http://hyundaihungthinh.com/uploads/images/files/tofegu.pdfIn PDF document text
    • http://asvpp.fr/pdf/56450139228.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f01c2ebde8---74469492703.pdfIn PDF document text
    • http://mywayrtk.org/userfiles/file/10708071740.pdfIn PDF document text
    • http://mhfmjournal.com/data/22/2/55/64/2544879/user/2788947/htdocs/userfiles/file/81353506700.pdfIn PDF document text
    • http://betonkeritesek.eu/Content/files/25964064786.pdfIn PDF document text
    • http://bjbtrh.com/files/pic/file/32207473591.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/80813079028.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd53cbd147---96904017462.pdfIn PDF document text
    • http://somsit.com/ckfinder/userfiles/files/22659409554.pdfIn PDF document text
    • http://burningspearmarketplace.com/js/ckfinder/userfiles/files/22314669321.pdfIn PDF document text
    • http://estatepie.com/files/userfiles/file/60728443971.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/67a02bac641be67b571ba0aab0d80e3d/28541500126.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161344c3a42082---xukiwoganudejigeme.pdfIn PDF document text
    • http://ellissi.org/userfiles/files/8420239351.pdfIn PDF document text
    • http://concilianavarra.com/userfiles/files/nilazotowesiwag.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/28ae6c537fe4707f94b52778f464ee96/6122617258.pdfIn PDF document text
    • http://ptk-tent.ru/userfiles/file/39875536269.pdfIn PDF document text
    • https://aznamaste.com/ckfinder/userfiles/files/wurajugi.pdfIn PDF document text
    • http://santabruna.cl/upload/file/76579895411.pdfIn PDF document text
    • http://craftland.de/res/wysiwyg/file/16982283509.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=how+to+recover+accidentally+deleted+video+on+androidPDF 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_off0000ecaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECAF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000104c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C6 10452 bytes
SHA-256: 8f7379b090f3477edfed888cf1ecb802fec24a0e0642498a3d9d5eb81beaf78e
font_02_sfnt_off00011c99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C99 18960 bytes
SHA-256: 7d029d69bb115516bf296154585408bb464906a2f7d760febeb44ff8c2012ebb

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