Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ce099166d43f938…

MALICIOUS

PDF

84.5 KB Created: 2021-09-15 15:44:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2d48f8096dd637bff1fbfa5e7c71b0f9 SHA-1: 458317e91ea06ca1072008dab4f4abc0e51963dd SHA-256: 0ce099166d43f938266a2fa6e1ef3dbfd0ce0255c69540fa3f506a52aa66d2e9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The heuristics reveal that the document functions as a link farm, directing users to compromised WordPress sites and other disposable hosting domains. These links likely serve to distribute further malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://laborke.ru/uplcv?utm_term=psp+highly+compressed+android+games+download PDF link annotation
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/fjt421te504i0gb2mgfvurc6s4/lipakideruxutasotugasez.pdfIn PDF document text
    • http://duet-czluchow.pl/userfiles/file/58302620352.pdfIn PDF document text
    • http://majedalkarkhi.com/pics/file/685551736.pdfIn PDF document text
    • http://gmtshipping.com/attachment/file/gajezogu.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/bi6rabct3qfecgd7ttk2atnj1r/rolixibebekudijijipemiju.pdfIn PDF document text
    • http://greenflameenergy.com/userfiles/file/subiwemoroderivalufanemix.pdfIn PDF document text
    • https://bvphcn.bdata.vn/upload/files/48328381994.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/5a3154539547cee7035445717b688090/51422678828.pdfIn PDF document text
    • http://www.dreamstoreonline.es/ckfinder/userfiles/files/31404987148.pdfIn PDF document text
    • https://mvmdigital.gr/files/files/sofilatusiduvubuxifoda.pdfIn PDF document text
    • http://clean-ecology.com/Upload/files/mekuxatinebodamamanugipez.pdfIn PDF document text
    • http://tourbusan.net/FileData/ckfinder/files/20210906_BFBEE0E17794836C.pdfIn PDF document text
    • https://marblo.com/app/webroot/img/files/61259879886.pdfIn PDF document text
    • http://icbiz.ru/userfiles/file/94284716958.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/161300d611b4ac---lilironijodunugurojirixas.pdfIn PDF document text
    • http://susasoft.com/upload/userfiles/files/dilipufisenokage.pdfIn PDF document text
    • https://kaptenhoki.info/contents/files/51253829846.pdfIn PDF document text
    • http://turar-mussin.com/userfiles/File/jinakinesarozotoke.pdfIn PDF document text
    • http://bassbasement.org/userfiles/file/25992676324.pdfIn PDF document text
    • http://gzbaosui.com/uploadfile/files/zusuguwukiju.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/6c03fb510863281accad4722fa6e2d9a/50868408523.pdfIn PDF document text
    • https://rheinfurth.de/userfiles/file/muwubujilurifes.pdfIn PDF document text
    • http://ylpqzl.com/ckfinder/userfiles/files/47524294730.pdfIn PDF document text
    • http://tochuchoinghi.org/files/50708925501.pdfIn PDF document text
    • 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_off0000e20b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE20B 11064 bytes
SHA-256: 7007938cdb6254c474f4d9419334d32179adb6f33651fb5794fac147f33cb389
font_01_sfnt_off0000fb73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB73 18920 bytes
SHA-256: d1176f998fc94f54339c7d925efe82e227a1e9e41431bb0ebc1f2c8171d74ab4
font_02_sfnt_off00012c27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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