Malicious PDF — malware analysis report

Static analysis result for SHA-256 11d0130c96f29e07…

MALICIOUS

PDF

85.3 KB Created: 2021-07-19 11:55:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6afe694252596cfeb4e4fe3d1081c7dc SHA-1: b55b906f082fe141c8160fa520b45397bfe16a79 SHA-256: 11d0130c96f29e07e96aa775b1d5268565067e232a8424c14e37ad7417f0ba53
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. The document contains a link farm pointing to multiple compromised websites, likely serving as a distribution point for further malicious content. The presence of 'wkhtmltopdf' in the metadata suggests it may have been generated by a tool used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16092d07aaffdb---kusatuf.pdf In PDF document text
    • http://bioident.pl/photos_fck/file/55384211296.pdfIn PDF document text
    • https://martensmgt.com/business_school/uploads/file/78704848036.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/43474919116.pdfIn PDF document text
    • http://mbcasc.net/imgs/file/gijexenozoresadedu.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16094c31c67245---11681961965.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d690f5dd7f---35504627962.pdfIn PDF document text
    • http://travelshops.pl/userfiles/file/boxefavufumebofajaw.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/52588136356.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/16081aed5593ca---46967590893.pdfIn PDF document text
    • http://studioguidobarbieri.it/userfiles/files/61804142780.pdfIn macro / runtime command snippet
    • https://eseninternational.com/uploads/files/mukirilawipalexego.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/opcv7768nsdtfirlabce3iapg0/34688012245.pdfIn PDF document text
    • https://bayihoki99.com/contents//files/66706063003.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607985f9416aa---30504406828.pdfIn PDF document text
    • https://giolog.biz/images/bulk_images/files/kobukixefuwimafu.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/74d74ef6a22f5f082b67cf423d646609/fexufazuku.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607582899b723.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609bdd660f811---20057120625.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160c2077353ac8---76765074742.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/f23ae67a7ef38140198651f2a7ff72f9/zetuzu.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/q1h39kopb3dtgds7rnqj5hd88g/23848420602.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c202fc815bb---xuredakuk.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/4buk6li11be2unk5oqk5mmotnn/17685957195.pdfIn PDF document text
    • https://monamifrance.com/FileData/ckfinder/files/20210616_850086A2B13F1325.pdfIn PDF document text
    • https://gute-reise.ru/i/files/files/40418386406.pdfIn PDF document text
    • http://www.idenet.net/wIn macro / runtime command snippet
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=ran+out+of+steamPDF link annotation
    • 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_off0000e4a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A2 20440 bytes
SHA-256: e45d316df57e42072a75f0818fd8cc5da40f9c7ddc3114e7a8b9ead2278a9802
font_01_sfnt_off000118d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000130ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130ED 10284 bytes
SHA-256: f9ad8a95a2a2c26707c03d43e35c559f45918e2f6b17f0c97c81912681e608dd

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