Malicious PDF — malware analysis report

Static analysis result for SHA-256 e56e8c7929fe8453…

MALICIOUS

PDF

88.0 KB Created: 2021-09-02 10:56:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d928511bae93582f36cede34991e1144 SHA-1: 087a072efff74cb66411bc15b2292529a7f7b7a3 SHA-256: e56e8c7929fe8453abe18fce31428b85efd38344117a621b173a41ecf9425a27
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to websites hosted on compromised CMS platforms or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The file's structure and the presence of many external links indicate a tactic to lure users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://huntic.ru/uplcv?utm_term=piecewise+functions+word+problems+worksheet+with+answers+pdf PDF link annotation
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/262945690d3ceb6a6911d9d703ded036/55700966475.pdfIn PDF document text
    • http://poorclarescork.ie/images/89739319075.pdfIn PDF document text
    • http://gelikonline.ru/content/Files/62636893994.pdfIn PDF document text
    • http://anthonyjcincottalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/29876785280.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/87689730825.pdfIn PDF document text
    • https://www.tanyadantus.com/wp-content/plugins/super-forms/uploads/php/files/c6d3ee25c6f34dabb692715592ed0292/72840286148.pdfIn PDF document text
    • http://ieeepes-thailand.org/app/webroot/files/files/95906578567.pdfIn PDF document text
    • https://melz-feu.ru/upload/92777594676.pdfIn PDF document text
    • http://lotusburbank.com/uploads/files/12783409682.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b96f67b4efe---zesatigujepulev.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/miwikozane.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16078a62c16921---peputavirojowekukado.pdfIn PDF document text
    • http://grafichesirio.com/userfiles/files/7981506815.pdfIn PDF document text
    • http://zzliuxue.com/upfile/file///jibugirit.pdfIn PDF document text
    • http://tomaszfilipczak.pl/userfiles/file/4515095570.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/27037309561.pdfIn PDF document text
    • http://gramercy-grand.ru/files/file/xunud.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/195949944a0ceb41be29d2b1086463ca/bozabupovajuje.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/m8b82shcof0cjmdvocf3196653/guxojanebijesekodozoda.pdfIn PDF document text
    • http://www.netcorp.hu/data/editorfile/1737811859.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e60c5b1f19---kutopoxilagugefumamazanos.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/49830622117.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/58ca839da02ba09df1d9fa12b16222dc/kanogisume.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a388f001df9---80351976823.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_off0000eca8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA8 11304 bytes
SHA-256: 1346ea72848aa1ecd7ab55c3cb72cb0efee880b0e369a787bcf9d06fed5a6dbb
font_01_sfnt_off000106e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ef6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EF6 19084 bytes
SHA-256: 6839ffe34177241b83e590aec21840e4ff7c4e7b0c926b9c54eab3939ed93cf7

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