Malicious PDF — malware analysis report

Static analysis result for SHA-256 82b1d84c9ff16b8c…

MALICIOUS

PDF

81.8 KB Created: 2021-09-12 05:20:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e4a6579e335a3e896a592c69713866e0 SHA-1: dddafd87e695c32929cf8d38f40ccea6d82edcab SHA-256: 82b1d84c9ff16b8cc393e3dc4cdf2f8dd5961f0c3600bae1f3e5fbf2d3184315
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan. Although no scripts were explicitly extracted, the nature of the embedded URLs and the heuristic firings point towards a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://chcial.ru/uplcv?utm_term=love+u+sister+quotes PDF link annotation
    • http://zh-huaxun.com/uploadfiles/files/dipaneguzetuvenofadu.pdfIn PDF document text
    • http://snap-drone.com/userfiles/file/vuvobu.pdfIn PDF document text
    • https://theloneranger.tv/clients/loneranger/ckfinder/userfiles/files/fevoxavifowedusewumu.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/4c594eb3175e200a494e1f17bd94a4d9/sujesibojatusomewiba.pdfIn PDF document text
    • http://xn--22cjbbm2eyae3ehabdb4kqdtae3dxnnc1fhf.com/user_img/files/narugepilib.pdfIn PDF document text
    • http://elmbbq.com/uploads/files/dibosuwipomuviketetega.pdfIn PDF document text
    • http://gruppocaminiti.it/userfiles/files/72597271026.pdfIn PDF document text
    • http://eg-connect.com/uploads/editorfiles/file///70561699969.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b3af1d3ef7---8119636167.pdfIn PDF document text
    • http://vers-ma.de/userfiles/file/sudakamiximefedurojov.pdfIn PDF document text
    • http://ucokampen.com/media/files/masotiwenemonizidixato.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/4393e15d27073dd2ffd3938a0744da88/gubilurodibi.pdfIn PDF document text
    • http://montpellier-business-plan.fr/mbp/upload/images/images/upload/ckfinder/lamokepurawenomaj.pdfIn PDF document text
    • http://jiangsutravel.kr/userfiles/files/20210911_230926.pdfIn PDF document text
    • https://ecpa.fr/uploaded/file/rilubokoxogojuki.pdfIn PDF document text
    • https://izr.fr/files/wexereberamux.pdfIn PDF document text
    • http://homelife-superstars.com/image/files/42934737621.pdfIn PDF document text
    • http://jin16888.com/userfiles/file/78063848303.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/fidapivajevilowuwuxeruf.pdfIn PDF document text
    • http://deurenhanger.nl/userfiles/file/puluwotobagunifot.pdfIn PDF document text
    • https://sunarchegypt.com/userfiles/file/gitok.pdfIn PDF document text
    • http://coutleelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/telusarasumamewom.pdfIn PDF document text
    • https://peltonfell.org.uk/ckfinder/userfiles/files/musemufabe.pdfIn PDF document text
    • https://ikomsolutions.com/admin/userfiles/file/33759605312.pdfIn PDF document text
    • http://minhanh.com/files/xilukisogemupikira.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_off0000de50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE50 17164 bytes
SHA-256: bc9f8e9c0c162e302d02accebf3609320e012a65e5292ae2636a58defb955a22
font_01_sfnt_off00010ae9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AE9 10060 bytes
SHA-256: b1cae2a3bdda5c7463e9cca0828249ea87180b52f716148c6c37e55f0b73a639
font_02_sfnt_off0001217a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1217A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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