Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4c86851ed3a66a7…

MALICIOUS

PDF

84.2 KB Created: 2021-09-01 02:21:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 940a158b0cd67030f6a9c44d6b5ac9da SHA-1: 21601040455e30b725c885bc99240bbc459f6a50 SHA-256: d4c86851ed3a66a78072a4d1c67f1af7b0229a35bf2428048673c344cf284cc8
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating it is likely a phishing or malware distribution lure. The file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URI heuristics and link farm detection further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://queure.ru/uplcv?utm_term=what+is+ethics+in+research+and+why+is+it+important PDF link annotation
    • https://kapokcmassage.com/uploads/files/202108250813026428.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2a3deebd15---28616702441.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c526ead9bd0---budemud.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/1mp3omsr1qfluj1t22koa9otum/nuzubunimosanagep.pdfIn PDF document text
    • https://hotnews.md/upload/userfiles/files/71148464291.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/xugijawizediradadozeda.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/gv30h6ps45nhf0fh6ucl4opvr8/25901849904.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/gu2g52rf2icbdq6i4kq4oiqhg4/judivaretudirinumaj.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a31690e7b58---50355711451.pdfIn PDF document text
    • http://ohmytour.kr/FileData/ckfinder/files/20210809_78351979A3993D9B.pdfIn PDF document text
    • https://signika.pl/Upload/file/jepasusabevunugasu.pdfIn PDF document text
    • http://www.toeterloeh44.de/files/pewifasajusupebolapumifum.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/39fjgb8usdepv82m5edj6ud6l0/34312510422.pdfIn PDF document text
    • https://coastalstudio.com/images/main/file/89594516649.pdfIn PDF document text
    • http://pnktools-th.org/ckfinder/userfiles/files/metosomaxegamatexasij.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/d2320135e4685a9f53eff00d95edf5e5/36780696794.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/hdbpj64ceobta5fs3vvr31b294/tupipujebipomajojun.pdfIn PDF document text
    • http://castrolmintabolt.hu/images/upload/file/93671946778.pdfIn PDF document text
    • https://all-stage-meditation.tw/uploads/files/61185b5464ae9.pdfIn PDF document text
    • http://anhhieu.vn/hinhanh/file/6831659237.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/13856355756.pdfIn PDF document text
    • http://ettermanenterprises.com/ckfinder/userfiles/files/31922195249.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/86bb035f7a96c152d9fe1389e091b657/rejadumax.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_off0000e4ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4EC 10928 bytes
SHA-256: 4cd9f308e604ccffe549a67415ef58d98487b4597fbe6287e425fa35721ed3a0
font_01_sfnt_off0000fe22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE22 17048 bytes
SHA-256: c34523128d633ca37442336e1b3ebe38085727fcab57447dec3fcc484f5eccf2
font_02_sfnt_off00012988.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12988 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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