Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d143d5a499e80b2…

MALICIOUS

PDF

92.4 KB Created: 2021-07-17 07:00:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 67688258509224c8775b7da5a1efacac SHA-1: c5b555c974dd3b7f4950eeed0d1615f3246934e0 SHA-256: 6d143d5a499e80b2b3a06b530cd9cc5a99884fa74cffcbf4967be26192a38fd5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous links to external websites, many of which are hosted on compromised CMS upload directories, suggesting a link farm or redirection mechanism. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, lacking clear user-facing content but containing embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160e12931200a1---89909407179.pdf In PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/3a88b53ee9435cafa5d9c6278265efc1/2595834761.pdfIn PDF document text
    • https://taipeitccia.org/CKEdit/upload/files/50286242679.pdfIn PDF document text
    • http://4grd.com/cmsimages/file/tekomizadizuputobefidex.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/orawomumafup.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5854b5fd18---xatokinajoluj.pdfIn PDF document text
    • http://aqbnb.com/uploadfile/file/xilugisawipateroruke.pdfIn PDF document text
    • http://hobbstownis100.com/clients/6/66/66141d04a4341350d76ae3a38785cb5a/File/39576404961.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/26148921389.pdfIn PDF document text
    • http://delvalle68.com/clients/54584/File/87350705651.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/vafupamikatopepe.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e43748afbe2---29660561739.pdfIn PDF document text
    • https://tomas-music.com/contents//files/95959671755.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a8ab3a945cb---rarorixofogibokezo.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/12307223280.pdfIn PDF document text
    • https://egyseg.eu/ckfinder/userfiles/files/87609599624.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/jalutozakipolakizizak.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c69ddfadfd3---92359208894.pdfIn PDF document text
    • http://evpltravel.com/xv_image/file/lukemukexifu.pdfIn PDF document text
    • http://ritadas.in/userfiles/file/zejenirofev.pdfIn PDF document text
    • http://pivotal-technologies.com/userfiles/file/41592732266.pdfIn PDF document text
    • https://burgaseguros.com/userfiles/file/14326143569.pdfIn PDF document text
    • http://dietmoiquangle.com/webroot/img/files/76065603203.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/c4ae2e76d467e39916dff47cb41caebe/torexaf.pdfIn PDF document text
    • http://alexhofford.com/temp/files/file/28218196944.pdfIn PDF document text
    • https://fzclicks.com/demo/files/editor/file/15837492151.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=creamy+baked+ziti+with+chickenPDF 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_off00010536.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10536 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011d48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D48 17576 bytes
SHA-256: 420470b62e91962d95d31fc3ec8ad5e5d26414c59adf543d3bd798971a8654b7
font_02_sfnt_off00014b5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B5F 10824 bytes
SHA-256: 05655f86909e878750731e74d0f7a735ec9be63567db29ecd5632e9def401682

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