Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bf5e21f54b0e90d…

MALICIOUS

PDF

84.0 KB Created: 2021-09-17 13:45:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: e9af81857f01be9fa3179c2a7fb682e2 SHA-1: ad8532a4acee6987e3ab5c181dc06f84e3e3b9c3 SHA-256: 1bf5e21f54b0e90d104f1432ad1f2e190f31b62cb7e9b6369e70ab7cb6901315
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or malware distribution attempt. It contains numerous external links, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious sites. The PDF structure and embedded links are consistent with techniques used to distribute malware or conduct phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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=wallpaper+pokemon+android PDF link annotation
    • http://synerfreight.com/syner_upload/images/files/jarofunimov.pdfIn PDF document text
    • http://hugslock.com/app/webroot/img/files/13646079570.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613fb3d091984---lisugazaj.pdfIn PDF document text
    • http://dywin.com/uploadfile/files/pazulozoluv.pdfIn PDF document text
    • https://ourlady-schools2.com/userfiles/files/xokuxubozoxivodexifi.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/161391693c5e7b---33715556036.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/d9eca6765bfd5a4022e8407b4fa87298/74777949849.pdfIn PDF document text
    • http://thietbiantoanttk.com/uploads/files/66422728269.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/mgranvafsq30ii679g12b7fnj7/46150726811.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/d794p3u53uq3005cl4grdv6i92/27026753341.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e2075e93cf---12154902340.pdfIn PDF document text
    • https://yuktogel.com/contents/files/buxefifelufi.pdfIn PDF document text
    • https://abandassociates.com/ckfinder/userfiles/files/80284291821.pdfIn PDF document text
    • https://sfeerweter.nl/userfiles/files/gunifupodowigodorutobi.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161378e5f89af6---repaguwaverawazoleb.pdfIn PDF document text
    • http://angelofthewinds.org/ckfinder/userfiles/files/mumulegem.pdfIn PDF document text
    • https://loffoxfitness.mvwebsolution.com/userfiles/files/kipef.pdfIn PDF document text
    • http://vlajkylevne.cz/UserFiles/File/guduz.pdfIn PDF document text
    • http://105chers.netsociality.com/upload/files/bajepolikurezaxepoxanim.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16142dfba5ab52---ralas.pdfIn PDF document text
    • https://certifiedcollisionrepair.com/home/cert/public_html/ckfinder/userfiles/files/93251506337.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/161412570afaa8---raxipovunulifidebigax.pdfIn PDF document text
    • https://iwanbim.iwan.co/userfiles/files/bimalorimafufiwenu.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_off0000dc36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC36 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f44d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF44D 10372 bytes
SHA-256: 5c4e0a20e261b1284961ac17621da95ce914be29d2db55c2c0eb9b2ad80e3236
font_02_sfnt_off00010ba1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BA1 21064 bytes
SHA-256: 5e71c48f10df940ad607d3810b78ea859b3f3c4cfcd04e549b3a2185843c433d

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