Malicious PDF — malware analysis report

Static analysis result for SHA-256 20149aac3bf943ee…

MALICIOUS

PDF

92.4 KB Created: 2021-09-05 17:44:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 096d313adc9e7bfb7c05069beb9a6227 SHA-1: 5632df101bb9b173f62e9d29f8928ea1bbeb4480 SHA-256: 20149aac3bf943ee67115ff1833c6a1fec542b9920803792140b1dc0c2501e21
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. The embedded URLs and the nature of the heuristics suggest an attempt to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://medvor.ru/uplcv?utm_term=hori+racing+wheel+ps4+manual PDF link annotation
    • https://mobile-translator.eu/app/webroot/media/files/28879122122.pdfIn PDF document text
    • http://hoteldanang.vn/uploads/images/files/kedutilekoxijoxe.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/2de9865c284dc1b1b4674b7cfced85b3/10112912448.pdfIn PDF document text
    • http://champaigncursillo.com/userfiles/file/disosegefilepapo.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160943eae4cd2d---64326705128.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160abb8fc90be3---66456675826.pdfIn PDF document text
    • http://mastera-mix.ru/ckfinder/userfiles/files/8705643742.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/19110205189.pdfIn PDF document text
    • https://perfecthospitals.com/ckfinder/userfiles/files/zuwamiweben.pdfIn PDF document text
    • https://sistemagestiondpr.com/userfiles/file/rukibuzukirikofe.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/cfihfsc2fnfbhk9t86nb1tltb8/59560238981.pdfIn PDF document text
    • https://aakritidigitals.com/userfiles/files/59392112965.pdfIn PDF document text
    • https://cakenflowersonline.com/userfiles/file/futowuridori.pdfIn PDF document text
    • http://imssp.by/data/images/fxeditor/file/32090790510.pdfIn PDF document text
    • http://project-lovcen.me/userfiles/file/78430194602.pdfIn PDF document text
    • http://szyuangang.com/UserFiles/file///vitobetobufuk.pdfIn PDF document text
    • http://naturallabs.de/userfiles/file/78358499897.pdfIn PDF document text
    • http://slhs1958.com/clients/18590/File/kinuzinisa.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/12fd3d9082527f30ae2325292f5de945/86850134186.pdfIn PDF document text
    • https://ms01bet.com/contents//files/vabene.pdfIn PDF document text
    • https://konyaalotaksi.com/userfiles/file/59616780668.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/9acf681ba919713277a96c219aef19db/doxegezip.pdfIn PDF document text
    • http://kwong-cheong.com/userfiles/84150975034.pdfIn PDF document text
    • http://loveperfectionschool.com/upload/file/guwarasofuwali.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4c810cb0c---91492015207.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ddfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f60f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF60F 16972 bytes
SHA-256: 39d05d2b70da3001e361857fa80d0fa044159404dbd52e0bcb120e20c9224339
font_02_sfnt_off00010ef5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EF5 23116 bytes
SHA-256: 265f1210f90596557cb98c783cc3c4775e71671dca01854e578d0e945e4cd894
font_03_sfnt_off00014a56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A56 10976 bytes
SHA-256: bede63bf278cb554e65aa8fbe27133fa829d0e2bb23a43ffe692825e394201cb

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