Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1bb8a96d2801a93…

MALICIOUS

PDF

70.6 KB Created: 2021-09-28 02:58:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: e8bcb764842c9a66ac1e985cf1a6f622 SHA-1: bbde58a8c225803b4d78253e5cef89f83289b2c6 SHA-256: b1bb8a96d2801a93acff9500302cf43744ea944f230ade8dbdc57c1edff2191d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains or compromised WordPress sites, indicating a link farm designed to redirect users. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this malicious intent. The ML classifier and ClamAV detection further confirm the malicious nature of the file, likely serving as a phishing lure or a distribution point for further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://wastran.ru/uplcv?utm_term=iphone+apple+watch+price+in+bangladesh PDF link annotation
    • https://webmenuplus.com/images/file/64215895177.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/4054781213.pdfIn PDF document text
    • https://shioturboapi4-xyz.com/contents/files/fuzezi.pdfIn PDF document text
    • http://fcv-bo.org/data/fcv-bo/userfiles/file/bulekupobopasafuteno.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ca90cd9663---larubawawunekifuwamod.pdfIn PDF document text
    • http://vncdata.net/app/webroot/uploads/files/98656087508.pdfIn PDF document text
    • https://kildevangen.dk/files/28022097150.pdfIn PDF document text
    • https://markmont.eu/editor_uploads/system/files/vutomogagako.pdfIn PDF document text
    • http://pixel-pro.ru/upload/file/batovisajomuwutovusam.pdfIn PDF document text
    • http://lucchetta.net/userfiles/files/tepezamuxowodebosagilepix.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/97316781167.pdfIn PDF document text
    • http://belgium-ex.com/images/blog/file/20156068791.pdfIn PDF document text
    • http://simp-q.ru/userfiles/file/rodid.pdfIn PDF document text
    • https://lensprovn.com/ckfinder/userfiles/files/tewesefiruxe.pdfIn PDF document text
    • http://balone.net/_upload/file///68461099445.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/dcb5d0c27b91b90c8b4fc39f5822ad88/lasegemerejaz.pdfIn PDF document text
    • http://tjsijiqing.com/ckfinder/userfiles/files/2021/0903/889f3d21c9be1fb649ba118c425015dc.pdfIn PDF document text
    • https://profitaler.com/UserFiles/file/likipile.pdfIn PDF document text
    • http://njbeihang.com/uploadfile/file///2021091403042782.pdfIn PDF document text
    • http://twtqedu.com/userData/ebizro_board/file/22752919560.pdfIn PDF document text
    • http://www.globalnautique.nl/upload/files/nigobakajawerikexif.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/56e7bed16059c494064767519260ea01/dexobifunikikeninuveju.pdfIn PDF document text
    • http://playeasypiano.com/resources/fck_images/30456832973.pdfIn PDF document text
    • http://dycelife.com/userfiles/file/16035814370.pdfIn PDF document text
    • https://npkfertilizerproduction.com/d/files/gufamin.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_off0000b14a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB14A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c95c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC95C 16164 bytes
SHA-256: 65fce6705ac28903af5b305006531cbbd21645edcf1e764ad35d6dac0608f56c
font_02_sfnt_off0000f233.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF233 10968 bytes
SHA-256: 625195ece395e0507ea29e077cd08eacaf4ee727929dbc617f77e2586a33662d

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