Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab736fe16fb73965…

MALICIOUS

PDF

103.5 KB Created: 2021-06-28 14:48:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: af001279a987188ceb0e53b9057c9b2e SHA-1: 837404116a291fb7c89ce317b456f826c0b3043f SHA-256: ab736fe16fb739654176606a291941613bbbb09f51bae72a9a9969c828d4f77a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to obscure the true destination. The presence of embedded JavaScript, although not directly analyzed for malicious intent in this report, is a common vector for exploiting PDF vulnerabilities or initiating further malicious actions. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9773

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://amon-syotengai.com/userfiles/file/28023508857.pdf In PDF document text
    • http://stark-tools.ru/images/uploaded/mafog.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f6c2475f17---ruroxizati.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/58b8374fa2b7fecad6713f0893e9b4b0/xamuxapojomoros.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/dumaxonixarikukejukuseba.pdfIn PDF document text
    • http://vietthanhstone.com/images/news/file/mofalimosejimuxumijefonud.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/b4d8460b1ecd2b3eb31e2ea634cca90f/63965014539.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202105/file/60379774089.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/4678c39854733d765de754ec2b336cca/86329608011.pdfIn PDF document text
    • http://immopolignano.lu/images/viwobizesilanoferefader.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/98c3d1443af85dae96c410d62f382386/xadapokegodowirazunij.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/ead54abea4724d2a6b99718a66da8190/jogaxipexusa.pdfIn PDF document text
    • https://teenvolunteerhouston.org/wp-content/plugins/super-forms/uploads/php/files/1116c984422ff75cb93aea6949ab631a/daxidamapeb.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/u301kp617ejanvcmhp3grs21a3/82661819968.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609845a28fe5b---porusodavolitopi.pdfIn PDF document text
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/0c6cbb5e9217a5b3f8760994f36d5a7d/bovav.pdfIn PDF document text
    • http://panteres.com/files/files/47171190109.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/bebe19b8700c5593d2720287099f171b/31310683607.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607da12179b02---piwuwufedifa.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099f47657db3---34597211566.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608fd7f0ef6be---18655195506.pdfIn PDF document text
    • http://cheumst.com/upload/fckeditor/file/36003493648.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-8/20210508192424354019.pdfIn PDF document text
    • http://arserwood.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210515150306668273gjbxta.pdfIn PDF document text
    • http://cosonhuath.com/hinhanh_fckeditor/file/59936173985.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/797a4aecbe4cc87aaa486ede8bdfa727/42481676762.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9ac57fc80---domibibufinorexogiforiv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=project+cost+sheet+template+excelPDF 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_off00013126.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13126 10676 bytes
SHA-256: b8281c3cab80320a86f04cf226d5ed2b6b7baba0934d8db6c482ee55a16462e4
font_01_sfnt_off000149b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149B8 17636 bytes
SHA-256: c6c9a15ae552a0078a7549ce145d85b43b8744c00e2a5ff2443850fe54510d78
font_02_sfnt_off0001782a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1782A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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