Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f67a2c88b64d927…

MALICIOUS

PDF

69.8 KB Created: 2021-09-25 01:16:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3010b7ed4c140020daa63ef1eebe2efa SHA-1: 60ea1bf5b8210401ec6a590457134f5fa28f55dc SHA-256: 9f67a2c88b64d92791b1b7b7ab526b20a1f1471d1263868ff60366d29bff9753
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

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://nomylo.ru/uplcv?utm_term=ragnarok+x+next+generation+download+apk
    • http://vipforiraq.com/userfiles/files/94652616531.pdf
    • http://ferrocom-spb.ru/userfiles/files/71421795785.pdf
    • http://skrabl.pl/www/rpbd/fck/file/kubafazeron.pdf
    • http://sellmysayarah.com/userfiles/files/44029471752.pdf
    • https://hoavily.com/uploads/files/27014513957.pdf
    • https://egc.ecrom.work/syo/files/zakumowudeka.pdf
    • https://www.lucaslobker.com/minor/ckfinder/userfiles/files/75330121872.pdf
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/522987ea54bd38dcdd8f74c2c8e0fccb/84016848656.pdf
    • http://cmtoolsrental.com/user_img/files/sidomefilofageb.pdf
    • http://smm-mm.com/uploads/news_file/34540714022.pdf
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16138c1e173f71---gabupelupoloxabexenuvumen.pdf
    • http://www.luna1956.com/images/library/File/85973163769.pdf
    • https://www.meditech.cz/ckfinder/userfiles/files/jofukugokovapizogaz.pdf
    • https://silverstonedevelopments.com/ckfinder/userfiles/files/gamedowadokazeleba.pdf
    • http://cerescommoditiesltd.com/Images_upload/files/bonotavi.pdf
    • http://maekalocal.com/Maeka/UserFiles/File/88069036250.pdf
    • http://madonnina.info/userfiles/files/24864103166.pdf
    • http://www.sname.org.tw/sname/ckfinder/userfiles/files/67131425605.pdf
    • http://pickup-ws.com/userfiles/files/laderaruvekebisoxobexesej.pdf
    • http://guides2alpes.org/uploads/file/rugadosefidunafupamiraju.pdf
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133d6bf91580---47103643450.pdf
    • https://pergamine.com/ckfinder/userfiles/files/zaxamosof.pdf
    • http://synphabase.ch/upload/file/61786554221.pdf
    • http://aztkgbv.love-mrt.com/upload/files/taludofilitugunulemoxub.pdf
    • http://9y.bfage.com/upload/files/20210912235035.pdf
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b3f3.bin
d18c8db355388ee3028ced02d17c920192be5a6c262caf8ac5c4251ad60c813f
pdf-font-stream PDF embedded font (sfnt) at offset 0xB3F3 10724 bytes
font_01_sfnt_off0000cc89.bin
60b93e6a170072f1550e017630a54521bfd238754212c76dcb478b3f4ab20490
pdf-font-stream PDF embedded font (sfnt) at offset 0xCC89 14572 bytes
font_02_sfnt_off0000f0f7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F7 16792 bytes