Malicious PDF — malware analysis report

Static analysis result for SHA-256 664e21abc0dbe323…

MALICIOUS

PDF

79.8 KB Created: 2021-09-20 10:54:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: a75f90bedc94ca9b5f014a20a93ca7ce SHA-1: baa27029f6c4c45d622436ef4a7837c843164985 SHA-256: 664e21abc0dbe3232bddfc4c305d0ad7acb685fa1a835187c94c3bbc3b86fad7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links pointing to potentially compromised or disposable hosting sites, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://erh-hu.com/userfiles/file/jewavikedukexanomekorava.pdf In PDF document text
    • http://teplo76.ru/uploads/file/rubisidubesijodi.pdfIn PDF document text
    • http://bestbelly.org/content/files/files/18972225743.pdfIn PDF document text
    • http://cycling-software.com/files/file/41044933425.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16137e14dba451---zopezolikupesikasus.pdfIn PDF document text
    • https://fleuriste79.fr/ckfinder/userfiles/files/98146868146.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/161431d4f6d3d0---74863497483.pdfIn PDF document text
    • https://weddingitaly.jp/images/file/29493672006.pdfIn PDF document text
    • http://akgwealthplanner.com/crm/files/82116424788.pdfIn PDF document text
    • http://salon-urody-bellis.pl/images/file/vapowumebozatisizevuxu.pdfIn PDF document text
    • https://zhongzing.com/uploads/files/202109120604142676.pdfIn PDF document text
    • http://airmon.hu/images/files/vuxufu.pdfIn PDF document text
    • http://getdol.com/page_data/file/tujebovusigisamux.pdfIn PDF document text
    • https://xn--22ck6bdp5cach0mc23a.com/ckfinder/userfiles/files/7785202260.pdfIn PDF document text
    • http://3colorjazz.com/fckeditor/userfiles/image/gujopi.pdfIn PDF document text
    • http://silverk.ru/img/lib/file/vogomi.pdfIn PDF document text
    • https://www.albriug.com/static/editor/ckeditor/ckfinder/upfile/files/josazojole.pdfIn PDF document text
    • http://medicare-darmstadt.de/bilder/UserImages/file/ninarawijobowoziwijuzinis.pdfIn PDF document text
    • http://lica.plovdivweek.com/js/ckfinder/userfiles/files/mitodanavinopeguz.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143ce7c11d42---tirokokujijijobosaber.pdfIn PDF document text
    • http://montesantangelo.it/files/files/26992680968.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/09jpnjg1jo34s5ldm9dem3p3vk/mezejakarifamo.pdfIn PDF document text
    • http://architetturaurbanistica.it/userfiles/files/zorutazur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=ld+player+emulator+latest+versionPDF link annotation
    • 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_off0000d5a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000edb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB9 10792 bytes
SHA-256: 1ff40c847464c2c29014b4b2414b737c08707b906b878c21e465be4603aef019
font_02_sfnt_off00010697.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10697 16500 bytes
SHA-256: a6db60db468b03f4fe82ee6d8d66761001b3dcfc109a58e058412cd55c460fdb

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