Malicious PDF — malware analysis report

Static analysis result for SHA-256 19df7bc84d45af9e…

MALICIOUS

PDF

84.5 KB Created: 2021-09-12 14:08:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8dd52c2e3eac3603d4dbedf07b1853b0 SHA-1: bed8c4f9e5639d8ae770e676697dddbaa496df2e SHA-256: 19df7bc84d45af9e228ba5f9e2d2012f37dd5f88c5248025ff612c573779d0f0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous URLs, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute malicious content or conduct phishing. The presence of external URIs and link farm heuristics indicates an attempt to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://allytemp.ru/uplcv?utm_term=connect+laptop+to+android+tv PDF link annotation
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613737ed0f7e4---gamarano.pdfIn PDF document text
    • http://uforoi.com/app/webroot/uploads/files/39037079701.pdfIn PDF document text
    • http://ever-pioneer.com/upload/files/fawanixukomemami.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16139da661cb11---militexudagiwimulakivaj.pdfIn PDF document text
    • http://bolshunoff.ru/images/wysiwyg/file/foronejubirubezifo.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161344587600c8---95611399086.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dd38e0a365---5234145862.pdfIn PDF document text
    • http://cascad-trans.ru/files/lixuneramezotazi.pdfIn PDF document text
    • http://hebammenglueck.de/ckfinder/userfiles/files/zisibuzirumeweborot.pdfIn PDF document text
    • http://korea-labels.com/ckfinder/userfiles/files/90055115326.pdfIn PDF document text
    • http://mosvag.ru/img/lib/file/61642301713.pdfIn PDF document text
    • https://organicearthfiji.com/documents/file/35224615380.pdfIn PDF document text
    • https://taichielite.com/louis/taichi/ckfinder/userfiles/files/koradikizelabuk.pdfIn PDF document text
    • http://www.thaiboat.net/image/upload/File/bimenimebizagakigereniwet.pdfIn PDF document text
    • https://daotaolaixesontay.com/uploads/file/93103048018.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/soxurafivereniduxuvapu.pdfIn PDF document text
    • http://fitviewer.de/files/file/zovenafalusam.pdfIn PDF document text
    • http://domusanna.it/userfiles/files/98595484332.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/files/javefuma.pdfIn PDF document text
    • http://kim-clark.ru/files/file/mogikexoj.pdfIn PDF document text
    • https://kingwaterpure.com/ckfinder/userfiles/files/79988211749.pdfIn PDF document text
    • https://rlmahtani.com/userfiles/files/93419539732.pdfIn PDF document text
    • http://patp1ryb.ru/media/file/ruwusofupipuviwefiwodak.pdfIn PDF document text
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/b3c35f1bdc1fcbcc56a58965a03ceef1/42782590269.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_off0000e4d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fcef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCEF 10436 bytes
SHA-256: 16135d4cd7f4c2ab96e89c2001a067959867332508105c9838d9b0c0ac9191a6
font_02_sfnt_off000114bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114BB 18700 bytes
SHA-256: 19f5f25064699df731f30d5ab6f035c7339fdbe05b4d2f6c248bbe81b59f51e3

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