Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b911f700f98775e…

MALICIOUS

PDF

77.6 KB Created: 2021-09-12 21:12:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ca1367206448fe9cb91caaa2262d70f9 SHA-1: 8b23735e6688feed980b30fabb7d7048c61b0a7b SHA-256: 3b911f700f98775e9c3a00652ddea1079de1263b9183d9aad45c661b7525ea29
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous embedded URLs that form a link farm, with several pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of 'LOLBin token sequence in document text' indicates potential command execution attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://gpba.ge/admin/ckeditor/ckfinder/userfiles/files/tewikotugigodida.pdf
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136f81e6e4dd---84522003197.pdf
    • http://polyacer-ecp.com/userfiles/files/20210912_042412.pdf
    • http://justsayhi365.com/uploads/file/86177984972.pdf
    • https://360clothing.indicsys.com/home/www360cl/public_html/uploads/images/files/vopopadeg.pdf
    • http://twsl.mingann.info/upload/ckfinder_temp/files/20210904171337.pdf
    • http://bc-arman.kz/ckfinder/userfiles/files/sogeremaf.pdf
    • http://charmingcurls.se/upload/file/runowopunugevudakodabibal.pdf
    • http://www.yevres.fr/ckfinder/userfiles/files/28556683347.pdf
    • https://dansobentre.net/uploads/file/nilavuxaxogumurodisuzopag.pdf
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/16131aee3914fa---romusarojipoduwovesisuli.pdf
    • http://hankyunget.net/userData/board/file/vebowupeferugu.pdf
    • http://suriyedostlukdernegi.org/image/files/44621381340.pdf
    • http://tjsijiqing.com/ckfinder/userfiles/files/2021/0903/8249f0291e3ce83f988f150e7de35638.pdf
    • https://indiantalentjunction.com/milan/media/18542168716.pdf
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/e6a083dc2ea694b90c8e66f4fa606c4a/5808829226.pdf
    • http://evevoyance.fr/adh/.-/file/mosopogadorawaxigipuziva.pdf
    • https://spheresignal.com/app/webroot/userfiles/files/xutogiw.pdf
    • https://mytalk7.com/_UploadFile/Images/file/54636340288.pdf
    • http://xn--2o2b17g32e8xisqq.com/userData/board/file/foginusuvomi.pdf
    • https://globalcareerclub.com/FCKeditor/userfiles/file/rololek.pdf
    • https://enilubricantvn.hoakhanh.vn/uploads/image/files/lesevoxofilepedadizejigu.pdf
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/5822426d5d3e69a2fb3bf56a877b6d66/wirirafofuzafufeledor.pdf
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/01e3dad0d6d6fe551af894024a74f93c/milisevosowuritit.pdf
    • http://lindendirect.com/ckfinder/userfiles/files/zifafukuvimoxobuxabidamu.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=inner+thigh+muscle+diagram
    • 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_off0000cd01.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCD01 16792 bytes
font_01_sfnt_off0000e513.bin
918422020187192895c3d03fc174d6419e02695e9c7e25084effa1bdb2b9c7f0
pdf-font-stream PDF embedded font (sfnt) at offset 0xE513 17244 bytes
font_02_sfnt_off00011091.bin
036e6f6acbc8603458c9a17e0e81d9db8989e5c96a49f21a8c64d71805860a5a
pdf-font-stream PDF embedded font (sfnt) at offset 0x11091 10748 bytes