Malicious PDF — malware analysis report

Static analysis result for SHA-256 244ea46651f9bfe5…

MALICIOUS

PDF

91.7 KB Created: 2021-07-05 13:12:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1b40b736b48a266362a292990e3b5770 SHA-1: d6084f4f2c2fcf27c4f7b0d331f9c81ee0e3f869 SHA-256: 244ea46651f9bfe5b0b730c6e8c232c310a3481cd63184bd381d61d58ca6b077
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of external links, many of which point to compromised websites and disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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 http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/lodur.pdf In PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f70e830fc---patagi.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160762689b336c---99584964773.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/gexerolig.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/0ek8a38mgefvmq0k94sv1i41qe/83486019967.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/68618624603.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/3a6fd580542b89c178de3da066f71831/foganunifuzobujuvo.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16078730ae0499---sitokatitanufamep.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/87deveitiuod3rrg9an8l22o5v/83706446662.pdfIn PDF document text
    • http://xdata.pl/app/webroot/img/ckf/files/83936909854.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8dd4615c30---lonarovo.pdfIn PDF document text
    • http://comp-art.ru/userfiles/file/89518036194.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2bde703155---70720544313.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/6d783b8e0552943c3189f0d9c7f6e4c3/zozigezumiwojedepugaren.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/811e84ab2c9f596d1da99f9843e17433/xexola.pdfIn PDF document text
    • http://mayinluatudong.com/uploads/userfiles/file/semibobedez.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/97567292301.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///majija.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/1a79b3e17b2a4bd1d5b20166729774eb/jumesanurofojoxeruduro.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160873a46bcade---93968204896.pdfIn PDF document text
    • http://xn--939a66v0zjo3bcvdmrp.com/data/ckfinder/files/63432013294.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/tusatevel.pdfIn PDF document text
    • https://ekselantechnology.solutions/ckfinder/userfiles/files/92499087729.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=example+of+leached+soilPDF 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_off00010596.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10596 16796 bytes
SHA-256: 9dde4b3f0597574617fed5ef394da5b757e8377a27aca7d37d81fd5b3ea5da7c
font_01_sfnt_off00013156.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13156 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001496d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1496D 10668 bytes
SHA-256: a9a92e7356ed46c5357961080db8ea37709a2018a96847c995b42a9d84de8783

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