Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b146aed79950aa8…

MALICIOUS

PDF

86.5 KB Created: 2021-06-28 22:08:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ae9ebddc1981d9c1e2a2b8d567475062 SHA-1: 80358a57d61f5077cc643df808efb7433c0feee0 SHA-256: 5b146aed79950aa8b0b9d7640b9ceedadce5650185fa9dd3e45cf9d0b4c93076
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs that point to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm to distribute malicious content or conduct phishing. The presence of these links indicates an attempt to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://queure.ru/uplcv?utm_term=how+to+put+a+worm+on+a+hook+for+bass PDF link annotation
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/4f18efc4d474665461b650254f3a207d/24667499242.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160d6785759b6b---10332409486.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adf502c796b---simezemediluzegusoz.pdfIn PDF document text
    • https://thesaddlebank.com/wp-content/plugins/super-forms/uploads/php/files/50kb6aq839l1j22f3nfl7titg2/limis.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/16086925cdb75a---91617704174.pdfIn PDF document text
    • http://piemonteforyou.it/userfiles/file/mofamomuneguvute.pdfIn PDF document text
    • http://regimhotelierbucuresti.com/images/userfiles/bedexazeme.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/o23mgfkjoo5rmlauh9olg9e4kh/xikigesolopamumen.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/f41fae21b69ebab26c959ca050fc78a3/24478701527.pdfIn PDF document text
    • http://www.lebedosapartotel.com/data/yukle/files/wozorodasufumamo.pdfIn PDF document text
    • https://willmarlakesarea2040.com/ckfinder/userfiles/files/wulotelusodi.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/18841913979.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/94019394669.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608090b833802---nowuzemusisivusowodaxogi.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095c5efcb8d6---87014536880.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/9888c211a034a21ff4050753435f501a/84449928454.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/44941779581.pdfIn PDF document text
    • http://webelievedin1984.com/clients/6/67/676624d6593aa512bfa6e10e765af00e/File/poxizujibapejuzikufewebi.pdfIn PDF document text
    • http://beta-rc.com/upload/files/79229015664.pdfIn PDF document text
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aeac794416---6765107526.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/40700986180.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c6357f9ab78---27155205937.pdfIn PDF document text
    • https://studio-september.com/wp-content/plugins/super-forms/uploads/php/files/d612830cb6f63ef8d7493ef408ea105c/21797163356.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_off0000f1a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A8 16524 bytes
SHA-256: f780daaba7179539d214907f5ce936d05cd389639c753b7f2da0f5d11472d3c7
font_01_sfnt_off00011c57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C57 10760 bytes
SHA-256: 88d67b9d469960caeffc17d7d26e30d58fa09a0c28e89f6a54b60c8f7952868d
font_02_sfnt_off000134ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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