Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b9dfdd6920d6390…

MALICIOUS

PDF

92.7 KB Created: 2021-09-08 09:53:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: eb87b3fec27607c959013f55e21d628d SHA-1: 96a938d8eaf3bf85f14dbbe3f360fc246d8abbc5 SHA-256: 8b9dfdd6920d639053f9813c0d012777ea81435f4c699d8204abea930085a866
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The document contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, suggesting it functions as a link farm to distribute phishing content or download further malware. The presence of external URI links and the overall structure indicate an attempt to redirect users to malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

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://smidgel.ru/uplcv?utm_term=wolfgang+puck+rice+cooker+user+manual PDF link annotation
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606eb74e2c19c---regenepojezuganilo.pdfIn PDF document text
    • http://staractivecollection.com/resimler/site/files/bafosoris.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608a9523e29ef---jaleg.pdfIn PDF document text
    • http://chiangmaicharmingtravel.com/ckfinder/userfiles/files/munuvedusu.pdfIn PDF document text
    • http://itena.si/uporabnik/file/kudutiremaderapozal.pdfIn PDF document text
    • http://buckleyfamilyofdarling.net/clients/0/01/017bf228c8331327bdfb67b1798bff80/File/82078603448.pdfIn PDF document text
    • http://www.louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/30557066068.pdfIn PDF document text
    • https://soudurelausiere.ca/upload/editor/file/84286606165.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/9a52f66f9bca537cc4b950949b7065c2/tibosotex.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6bf0918b8---dadimukojojitikonulep.pdfIn PDF document text
    • http://getampedmag.com/ckfinder/userfiles/files/28355242442.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b857def18fd---natuvozafeb.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/62e60e43df04aeef8a3cffc018a47a43/gofisotebegirawaf.pdfIn PDF document text
    • https://jechrina.gr/FCKeditor/userimages/file/67855804115.pdfIn PDF document text
    • http://werder-ritter.de/UserFiles/File/xisamalavulujesul.pdfIn PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/pph65gnu4vbqejdlbhro8uk201/gulirironejebufigekajoj.pdfIn PDF document text
    • http://siciny.pl/userfiles/file/87466334869.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/obd7784i7dujchbk7hato7u0tu/gufotarep.pdfIn PDF document text
    • http://girc.ncue.edu.tw/ckfinder/ckfiles/files/fakopowikur.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/0065feaf66a16bba4a7b3ee0ee417a70/vopotixego.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16109729beefe5---mazasezetivaw.pdfIn PDF document text
    • http://gvs-russia.ru/admin/ckfinder/userfiles/files/dafotapomelumexenajupiw.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160ecd6a915225---mapazovatarevuzovaze.pdfIn PDF document text
    • https://atvatextile.com/upload/ckfinder/files/vefatuvifavenekedodojime.pdfIn PDF document text
    • https://jahanchart.ir/data/files/file/12836179744.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/vn98fv9duapahtb6ohk3geo2s9/99231186603.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/57062637287.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_off00010300.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10300 18428 bytes
SHA-256: ffb6d2b80140ad290bc2c5084139af7c08817cc503c30f9640755eb71590e324
font_01_sfnt_off000132f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132F4 10912 bytes
SHA-256: 8a19294f8ca3c73fb19d4a6284777503caa6fd068b5a95cddb378c81171a5ff7
font_02_sfnt_off00014c3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C3D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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