Malicious PDF — malware analysis report

Static analysis result for SHA-256 e43a370e868ce591…

MALICIOUS

PDF

89.2 KB Created: 2021-09-02 06:16:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1897534bdcd78096c27bcd66f0299aeb SHA-1: ffb4e5d24c97e407095199a748101bcdff8088db SHA-256: e43a370e868ce5919b22c27ee931e10dcc98c8d60cdb314cc0ee5cdd60eb1ee0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious. It contains a link farm pointing to numerous external PDF files hosted on potentially compromised or disposable domains. The primary purpose appears to be directing users to these external resources, which likely host phishing content or further malware. No scripts were extracted from this sample, but the structure and URL patterns are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://gorsilawfirm.com/userfiles/file/53910049567.pdf In PDF document text
    • http://pantipplaza.com/userfiles/file/wodijusorigowesegosi.pdfIn PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-7-6/20210706214955313819.pdfIn PDF document text
    • http://locthanhwindow.com/img_duhoc/files/45399537762.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/1p7hurquf6f9inbcedglr64a79/53978525740.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16089b08ed26d3---rixazewafusafevimo.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/00e1b5cadedab11160741e8911977ddd/xemux.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/zawekodotodugepogefa.pdfIn PDF document text
    • https://medtek.vn/storage/file/98334841099.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130355c4ae19---pefumofisisidalavuzedobi.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b272e6049---vekanibese.pdfIn PDF document text
    • https://windfreeklima.com/upload/ckfinder/files/kiwogij.pdfIn PDF document text
    • http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608527f410c67---zuwap.pdfIn PDF document text
    • http://gavinlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kofuwiwinizo.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fccfc14ab87---46847248631.pdfIn PDF document text
    • http://lhs75aa.org/clients/0/08/08eb77d093c5251d787cf05842b4a73c/File/wufotazowopemigawezigob.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/l87v1fieapsaj7jb29usla5g1i/depufiwilubuvido.pdfIn PDF document text
    • http://mgtofubbq.com/uploads/files/79257685951.pdfIn PDF document text
    • http://lubrifianti-auto.ro/files/file/rezotenajutesegajewene.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1611c7c4459c61---4925386491.pdfIn PDF document text
    • https://cornerstonelaw.eu/userfiles//file/tikemezinixuf.pdfIn PDF document text
    • http://pokewaveanaheim.com/uploads/files/87196259241.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d6f75f5e5---kujewemon.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/b76bb93aecb4792f0d4bb31d70dc7308/70919585640.pdfIn PDF document text
    • http://nikacarpet.com/My_Project/Hamishe_bahar/ahar_img/files/26739186730.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=almost+naked+animals+duckPDF 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_off0000f1fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1FA 10604 bytes
SHA-256: 28ebcf841019a5990b349b0302cf39ed994c95e28c3a8e2244e764be860eb8c5
font_01_sfnt_off00010a3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A3D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001224f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1224F 19452 bytes
SHA-256: 224dccb1c1f9eba7f9f8fd267ca825f1d5c0456feffef48a6c0c05d0fe76ac20

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