Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdee427027044ec9…

MALICIOUS

PDF

93.6 KB Created: 2021-09-19 14:02:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 756aa84b6a2c78e17bef12c837908614 SHA-1: 5436788c72ec35e78a8f0836ab6b7fd6eb701c86 SHA-256: bdee427027044ec951905ac519a81a60b61fc0b028e573c710305f600f788d55
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, with heuristics indicating it functions as a link farm. Multiple URLs point to external sites, some hosted on compromised WordPress installations, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the nature of the link farm indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://crewmak.ru/uplcv?utm_term=liker+apk+instagram PDF link annotation
    • http://toyotarent.tw/FileData/ckfinder/files/20210905_311D279AC33F7DF4.pdfIn PDF document text
    • https://shidoremicrosys.com/media/24407293221.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/87826880269.pdfIn PDF document text
    • http://www.rannatennis.ee/data/upfiles/files/wiwojejo.pdfIn PDF document text
    • http://allgeology.ru/ckfinder/userfiles/files/83449519830.pdfIn PDF document text
    • http://unseretochter.com/images/file/12308493286.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/8t8eii5g3anf4cqka37o394gk2/42438519644.pdfIn PDF document text
    • http://ceomit.com/fckupload/file/mowofaruwojevakut.pdfIn PDF document text
    • https://onlinendttraining.net/files/78565774597.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/d39db57abd595b863126f99a5b9a7a94/36827768599.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/161394e4d73887---44105759883.pdfIn PDF document text
    • http://dogoducthien.com/uploads/files/34615851092.pdfIn PDF document text
    • https://pensionradvanice.cz/res/file/rukituj.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1614333d3d1516---reropimuripufovolos.pdfIn PDF document text
    • http://gernano.eu/gfx/userfiles/files/28549755516.pdfIn PDF document text
    • http://ippon.lv/uploads/File/pogosiduzigafujokoxurili.pdfIn PDF document text
    • http://anaminfo.com/attachfile/file/57940004070.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/cbb76d44ca821fb2d88604800bdce55e/5927894097.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/sg4k9dbmsbincbu64tu72mul75/gapujuzuxixudeze.pdfIn PDF document text
    • http://furnitura-syndicat.ru/ckeditor/ckfinder/core/connector/php/uploads/files/sinuwufodonenuvaxosax.pdfIn PDF document text
    • http://laptopcuhaiphong.vn/upload/files/46705650271.pdfIn PDF document text
    • 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_off000107a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107A1 10480 bytes
SHA-256: d588f2b3762347e22712a6550ffe229334f84752bb8e4256591d901e303d1bb9
font_01_sfnt_off00011f70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F70 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013782.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13782 18940 bytes
SHA-256: fff6c68e07a9ac981ca7987ab05afa04135db0ef300e7b8146397a181933f3e4

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