Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fec5c107dd558c6…

MALICIOUS

PDF

84.7 KB Created: 2021-07-01 09:30:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 567defcda79e0ec748743cbfb3d3f5ec SHA-1: 858a6f99ea246c8500f8c4a152aa021540b6a49c SHA-256: 6fec5c107dd558c6208377d03dda7ccf29ca5959fd5717e2267758128fe3ae22
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, which is a common technique for delivering malicious content. The sample also includes numerous links to compromised websites, suggesting a phishing or credential harvesting attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a61640a4aec---99052357224.pdf
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/03f4ef99f222fb325f8c6405ce94bede/70999693966.pdf
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160945ac999920---mulagipemafetisifetivage.pdf
    • https://luxesystem.site/js/ckfinder/userfiles/files/regamibudebevufebapoxeg.pdf
    • http://booklandbooks.com/userfiles/file/33975616390.pdf
    • http://capital96.com/userfiles/file/1933238062.pdf
    • http://outspokenholland.com/userfiles/fckFile/20210530090445.pdf
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/505413306d61705673cdbc5103896b13/15856877140.pdf
    • http://www.cddfct.com/up_files/file/wasububusavaf.pdf
    • http://pmmagic.vn/userfiles/file/43417978746.pdf
    • http://lltsg.com/uploadfile/file///2021062717154521.pdf
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609836d5c0d33---vimasubamojubifoz.pdf
    • http://elfuklid.cz/foto/Image/file/toravedimaxewigeb.pdf
    • https://bnovum.hu/downloads/71707959392.pdf
    • http://drironcat.com/images/file/99798111434.pdf
    • https://iwistw.com/upload/files/16267827516.pdf
    • http://wamer.org/userfiles/file/44562968363.pdf
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/6c08ef76554b8be6ceea050a1291d42b/tavotagakojitasuvimibe.pdf
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/aff36113a947ba7fa9b996bef4d86fcc/savos.pdf
    • http://scales-center.com/shop/fck_file/file/45863607449.pdf
    • http://aklond.com/UploadFilesfile///2021051116314638.pdf
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c982577ebd5---legozobadevejemerudazuzu.pdf
    • http://elyriacatholic1970.com/clients/7/79/79c6984f8945646ae1b55d50a6b4dbab/File/33229745285.pdf
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/dlrli2eu5mkbej4pfo8o7lmgq5/jetolezuno.pdf
    • http://szyuangang.com/UserFiles/file///17734599203.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=truth+table+exercises+with+answers+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_off0000e58d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE58D 16792 bytes
font_01_sfnt_off0000fd9f.bin
5125564576004c792d59aad7f46f38933436c5ceea1eb5562027a09e0575d070
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD9F 17612 bytes
font_02_sfnt_off00012be5.bin
5e4477850b9e620dac5a66ef27895788e6ad2cc056cf5d6c8099d95aaf346a77
pdf-font-stream PDF embedded font (sfnt) at offset 0x12BE5 10988 bytes