Malicious PDF — malware analysis report

Static analysis result for SHA-256 03e1fbfeacadbd98…

MALICIOUS

PDF

98.3 KB Created: 2021-06-30 22:07:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6f3a38a1975e4e0da2b185bd462a12ff SHA-1: 261cf72f35c49f479723fc0936f7faa74c2c3c8f SHA-256: 03e1fbfeacadbd98dc78ca3d552607e62e6e417cb8bc15d9b093781f3cbc6856
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, with numerous embedded URLs pointing to potentially compromised WordPress sites and other disposable hosting. These links likely serve to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9906

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 http://boilerservis.ru/uploads/files/ravafama.pdf
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/fnrv218eod8uje5sl8719h0jsp/dijuwo.pdf
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/778ordpo379jup06g1q76cfncf/rumuguku.pdf
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d825e37916---29013316269.pdf
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/7eb1c1290385db8b1bd57d443a2694c0/ruroxebibofizame.pdf
    • http://artospace.com/pics/file/fajugenevu.pdf
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e5899253e3---fabuvafifesadipisu.pdf
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f006e9237b---41588315035.pdf
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/16080f3d2eae6d---xesajajosetuk.pdf
    • https://beautyreviveshop.com/newerac2c/userfiles/file/7290734369.pdf
    • http://andlupa.com/userfiles/file/desomasuduxanopojen.pdf
    • http://magogaralbamoble.com/galeria/files/dujelogaxuj.pdf
    • https://irisapp.cn/uploadfiles/fckeditor/20210516/file/16211037949811.pdf
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1607e57326e07b---38526063976.pdf
    • http://normel.org/files/upload/file/vaniboxufepaj.pdf
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/2trsofsvogdvsb5dg1gccooi18/roxekonivipugifoket.pdf
    • http://wanyuantemple.tw/userfiles/file/27555199973.pdf
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/8i6cc0tidskebpohd5qi25es47/dekege.pdf
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b8cad0cd95---rinajanejepupefafogurele.pdf
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/f3ec295c75850f530b44fd1af45b28e4/tafadexunakituner.pdf
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c48d7cc9287---63311393526.pdf
    • https://666666.vn/upload/fck/file/sejapijufadef.pdf
    • http://slstudio.it/userfiles/files/movujatolobiwus.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=what+are+the+special+keys+on+a+computer+keyboard
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000101b6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x101B6 16792 bytes
font_01_sfnt_off000119cd.bin
47246e3e792527855f02993b8cca5211472e42f9789f7fbbd82a900a15d7511d
pdf-font-stream PDF embedded font (sfnt) at offset 0x119CD 11216 bytes
font_02_sfnt_off000133ad.bin
bb32c68aaf9d83371a175a7d70fac57272117aa1623b71625c85e21b532290c3
pdf-font-stream PDF embedded font (sfnt) at offset 0x133AD 16112 bytes
font_03_sfnt_off00014900.bin
63b2343ce5f126cc5c250946f93c451d053a241510db3db8658123a7b3642f0d
pdf-font-stream PDF embedded font (sfnt) at offset 0x14900 18968 bytes