Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c53072f0592aa3e…

MALICIOUS

PDF

97.2 KB Created: 2021-09-07 18:26:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b2e122b108f76b385a7e61c795134072 SHA-1: 32ee2a6d37a96618aa33f3b82464f3970d5da4f5 SHA-256: 2c53072f0592aa3e07649c11ca6478cd80e0f90b6d90d39a362d31674f609100
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a small PDF acting as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or delivering a second-stage payload via the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

Heuristics 7

  • 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.
  • 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://illinoislivestock.org/userfiles/file/55866235162.pdf In PDF document text
    • http://tvkinter.com/file_media/file_image/file/32499573495.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/16073aca27f231---82666868748.pdfIn PDF document text
    • https://www.lucaslobker.com/minor/ckfinder/userfiles/files/43447389246.pdfIn PDF document text
    • http://hwayinn.com/image/files/20210608_204221.pdfIn PDF document text
    • http://championsview.net/userimages/vopaxumozenukofosovexuja.pdfIn PDF document text
    • https://vnmmalta.com/userfiles/file/37522550132.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b7ed06bbaad---23993024229.pdfIn PDF document text
    • https://www.bakkersvlaanderen.be/resources/plugins/ckfinder/userfiles/0/files/73053811254.pdfIn PDF document text
    • http://zbraneklapka.cz/ckfinder/userfiles/files/nitedo.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612004c751ee9---5855796783.pdfIn PDF document text
    • http://eltdb.com/UserFiles/files/73874642816.pdfIn PDF document text
    • http://onnetsolution.in/userfiles/file/374963438.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d084571e848---tobosufude.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a26543d0dee---nipuwejukaremekep.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb40719238---regubobegikoki.pdfIn PDF document text
    • http://notarbrazda.cz/userfiles/file/xegikavajo.pdfIn PDF document text
    • http://webs123.com/userfiles/file/kexetola.pdfIn PDF document text
    • http://rfinshaat.az/userfiles/file/kumovunewulukijopit.pdfIn PDF document text
    • https://noble-program.site/js/ckfinder/userfiles/files/40027921691.pdfIn PDF document text
    • http://hauptlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gapubalesofegedowupul.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/47259144171.pdfIn PDF document text
    • http://ya-ke.cn/admin/upload/41681660758.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/20210704/210704120734234851v611teslrzg0.pdfIn PDF document text
    • http://linklandhotels.com/upfile/editor/files/ramezegivovezigota.pdfIn PDF document text
    • https://vibangnhadat.com/uploads/files/51064691644.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=gear+manufacturing+process+pdfPDF 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_off00011527.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11527 18268 bytes
SHA-256: a371f6184d2be468283c8a30c7d58aa4382602b116369ce55cd990f1ce33d50a
font_01_sfnt_off000144f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144F1 11056 bytes
SHA-256: 802d14d91b60ba52eaa1bacf28b6d79f105dffa6a96a6c21d11329235e02c3bb
font_02_sfnt_off00015e79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E79 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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