Malicious PDF — malware analysis report

Static analysis result for SHA-256 92ed5d966a8986ab…

MALICIOUS

PDF

81.3 KB Created: 2021-09-18 11:32:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8df1d105b9194565849fac54da2ffca9 SHA-1: 3404d06d49c88ac223db3ec14a742c996ff78be1 SHA-256: 92ed5d966a8986ab5154196448f416946548cff668672b5677bef6c5a35d5204
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious Link

The file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. Multiple heuristics indicate that the PDF contains numerous links pointing to various websites, some of which are hosted on compromised CMS platforms or disposable domains. The presence of these links suggests an attempt to lure users to potentially malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://yearbookplus.com/uploads/ckfinder/files/tojatami.pdf In PDF document text
    • https://i-intelli.com/ckfinder/userfiles/files/fimal.pdfIn PDF document text
    • https://tekmaker.com/upload/files/jawodadefafaxakatob.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/6rpuj9mmp9toaipk3p5n6utlc2/jivikabumazugemixekemur.pdfIn PDF document text
    • https://dubigroup.com/admin/fckeditor/editor/filemanager/connectors/upload/file/wagojapege.pdfIn PDF document text
    • https://mondoaudio.it/img/uploaded/file/leterisoluw.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613d0e7d58317---legivelupigadidomaluz.pdfIn PDF document text
    • https://traicaygiasi.com/Images_upload/files/tufijowuruxi.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc343c7bdc---88855551937.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/43845292578.pdfIn PDF document text
    • https://bodymason.com/user_uploads/files/43671505371.pdfIn PDF document text
    • https://pmrmhss.com/userfiles/file/40974997242.pdfIn PDF document text
    • https://maggies-handmade.com/UserFiles/files/muzoxafinus.pdfIn PDF document text
    • https://eqonetech.com/upload/userfiles/files/31741176606.pdfIn PDF document text
    • http://dotacjedlaoze.pl/userfiles/file/balidapudolitalikawage.pdfIn PDF document text
    • https://glory-aqua.com/userfiles/file/sufumuzupujuperafuxik.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/70399283925.pdfIn PDF document text
    • http://odra.cycling-recycling.eu/imgturysta/files/95708830924.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/wazemawakevegasefunimiki.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-9-1/20210901220142106397.pdfIn PDF document text
    • http://xn----itbbfrdrdbd4bgy6gi.xn--p1ai/webroot/files/files/98594207965.pdfIn PDF document text
    • http://daehnfeldt.com/userfiles/file/18303278684.pdfIn PDF document text
    • http://locum-system.pl/userfiles/file/romuzupumonew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=weshare+apk+downloadPDF 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_off0000d81e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD81E 10468 bytes
SHA-256: 28ceb14728081c980afcdaa009a652e0feaa5dbb5f5bfac3406b2992bb23a71e
font_01_sfnt_off0000efde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFDE 18640 bytes
SHA-256: 0b070ad20c2bbe703bbe724aed6791fa9fa3d1b1f836a69b805f5ff3857abf7a
font_02_sfnt_off00011fe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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