Malicious PDF — malware analysis report

Static analysis result for SHA-256 311f13727fbf99d9…

MALICIOUS

PDF

85.3 KB Created: 2021-10-11 23:54:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 5b775f8a9b8e12b462c37ccf99d0ce26 SHA-1: c7958fd132252b9cf9d52a048c6220f6ae4e86fe SHA-256: 311f13727fbf99d9505e11325b157fe74a91e56c8048519d7af3760c3fed1884
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, flagging it as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to PDF files hosted on various domains, many of which appear to be compromised CMS uploads. The presence of these links suggests an attempt to lure users to malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://gulfsupremesa.com/ckfinder/userfiles/files/60968058942.pdf In PDF document text
    • http://hatowo.com/app/webroot/uploads/files/64649441007.pdfIn PDF document text
    • http://noticiascgnews.com.br/ckfinder/userfiles/files/42957804685.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b342610219---19434922233.pdfIn PDF document text
    • http://shinex-auto.com/userfiles/file/61277589518.pdfIn PDF document text
    • https://cbdc.co/uploads/ckfinder/userfiles/files/nuzimanilorum.pdfIn PDF document text
    • http://mexxeopaint.com/upload/files/58789404868.pdfIn PDF document text
    • http://jezirka-biobazeny.cz/UserFiles/File/98137827795.pdfIn PDF document text
    • http://mwcapital.net/ckfinder/userfiles/files/zuluwodoguriwamewenijep.pdfIn PDF document text
    • https://jecoexports.com/ckfinder/userfiles/files/dusopujemajajapasine.pdfIn PDF document text
    • http://artdental.hu/editor_up/57382682544.pdfIn PDF document text
    • http://www.atsamuihaus.com/image/upload/File/nibipepe.pdfIn PDF document text
    • https://conrays.ru/f/data/kakuri.pdfIn PDF document text
    • https://kovtec.pl/eurostyl/photos/file/vesewaxidizud.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/16161d33a8cfce---texelek.pdfIn PDF document text
    • http://ansatrans.ru/admin/ckfinder/userfiles/files/70207587547.pdfIn PDF document text
    • http://boldino-hotel.com/ckfinder/userfiles/files/gibojabuwugalovomiwo.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1615d3f10a1abf---nuniwima.pdfIn PDF document text
    • http://linker-apps.com/files/1311690653.pdfIn PDF document text
    • http://auswallendorf.de/userfiles/file/tekolebilarifirujof.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/b8be54a5bc0a7c90055e9007802ddb45/butetomutafesoj.pdfIn PDF document text
    • http://vector-food.com/userfiles/file/13182211444.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/6888426e16484325c05970de2a56288e/kilezore.pdfIn PDF document text
    • http://sartoriaventurini.com/userfiles/files/ramirum.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1615bfa8dceea3---96043630068.pdfIn PDF document text
    • http://whuntex.ru/userfiles/file/guzinededupoguwofu.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/d1942362afc9c1d4067a65728edd89e3/76056653700.pdfIn PDF document text
    • https://tierrettung-in-katalonien.org/ckfinder/userfiles/files/16258727493.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/RC0zOYPQW8A/uplcv?utm_term=neck+cracking+and+poppingPDF 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_off0000e5f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F8 19180 bytes
SHA-256: 107684e919972c36a7e73f208ffad9e75520d9e8f5bb236a639a271658e9ea1a
font_01_sfnt_off000117aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117AA 10448 bytes
SHA-256: 341fdab78a0c09e47401eaf84a6b9e695c7bb286a12d021b920a55051075130f
font_02_sfnt_off00012f3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F3C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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