Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ab8e90a1cd4e7bb…

MALICIOUS

PDF

75.9 KB Created: 2021-09-10 14:48:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8912ff2d25cc66c4774161019db82ac6 SHA-1: 2a4093a3e89e0a0ebbc095ab2e4240c8e2561333 SHA-256: 8ab8e90a1cd4e7bb8e43fc5d76a60d526f497e5a33fb03c9fb29e6a207014d17
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It functions as a link farm, directing users to numerous external URLs, many of which are hosted on compromised or disposable domains. The presence of external URI indicators and link farm heuristics suggests an attempt to redirect users to malicious content, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 6

  • 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.
  • 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=pes+pro+evolution+soccer+2012+apk+download PDF link annotation
    • https://natatourism.com/userfiles/files/jimofa.pdfIn PDF document text
    • http://formpart.com/upload/ckfinder/files/wuxumojitozatotikofala.pdfIn PDF document text
    • http://ancient-theater.gr/media/file/vevab.pdfIn PDF document text
    • http://bresky.cz/res/file/kiboju.pdfIn PDF document text
    • http://machinegroup.ru/img/outer/files/newetapividase.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138875eb726f---8027221967.pdfIn PDF document text
    • http://rilta.net/userfiles/files/11312537706.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161322a8781b27---tiwanijagaz.pdfIn PDF document text
    • http://szyuangang.com/UserFiles/file///57126621102.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16131fa03dc656---zuxajikijumunovapize.pdfIn PDF document text
    • https://ce-mi.pl/uploads/userfiles/files/ridedopedekajedulex.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130d3a75eb71---pewoxedosejonadijanez.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/31005665355.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16130daabce761---51838976843.pdfIn PDF document text
    • https://clubelsendero.com/img_pag/file/1027257354.pdfIn PDF document text
    • http://abwingsva.com/uploads/files/modapufejizabup.pdfIn PDF document text
    • https://vleek.com/uploads/files/43049239416.pdfIn PDF document text
    • https://otterdisplay.com/userfiles/file/72903463904.pdfIn PDF document text
    • http://sunil.kr/uploadfile/fckeditor/file/pulajitepokiwuwerapoleno.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/101866afcd564546b8c9041d0ded2785/wumozibejidoka.pdfIn PDF document text
    • http://s292376414.onlinehome.fr/datas/imgmail/file/29902587572.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_off0000bc18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC18 11148 bytes
SHA-256: 047b5fb48473c94b5be3e2203756822dff6d8362d5694cbb8067c27d96409937
font_01_sfnt_off0000d66c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD66C 19768 bytes
SHA-256: e635bf93bf9cff1ed9fcec08e100b82a58eee9e6306725b42db0386ce4726e74
font_02_sfnt_off000109e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1