Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4b99e41acd273f5…

MALICIOUS

PDF

83.4 KB Created: 2021-09-04 23:47:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f833e8d764372aa1c772189f20cbe165 SHA-1: 52470128ca84deb64468606f54942d9d52f54fee SHA-256: c4b99e41acd273f5f0ce79421ec8b816abf81f8f586f7fdf00d779ef6bd832fa
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious. It contains numerous links pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to distribute malicious content. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature. The file likely serves as a lure to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://garglob.ru/uplcv?utm_term=prova+unesp+2019+pdf PDF link annotation
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac897b16e33---fedifowajasukotiwakaban.pdfIn PDF document text
    • http://di-tech.kr/fckeditor/userfiles/file/85313678194.pdfIn PDF document text
    • http://plymouth-logs.co.uk/ckfinder/userfiles/files/gafifikoxen.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16108431441f11---21036136834.pdfIn PDF document text
    • http://icloudcleaners.com/uploads/account/autoresponderfiles/88164183060.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/ae31bc01d42909c2e40f533332259bbe/befilileke.pdfIn PDF document text
    • https://x-software.cz/data/file/955539701.pdfIn PDF document text
    • http://dancingstarsgreenwich.net/clients/1/10/10f73e4104fe6082999c9b722aa65ba2/File/fufonole.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/7408eec6edb0f1e8cc014dc2546db9d4/36873959822.pdfIn PDF document text
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/6iv6g0ue0b088rrak6fnfnfe5p/mewevasawijedilaf.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210623174325418.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077883c5ab1b---29847678470.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7f831e707---sekuxejizazari.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/a4e2f21a2c6ec849db67a3ab150336d1/6170873519.pdfIn PDF document text
    • https://adsbudget.net/userfiles/file/72793522417.pdfIn PDF document text
    • http://toshiba-center.ru/uploads/files/jetuvera.pdfIn PDF document text
    • https://alteanetworks.fr/img/file/migodivupofuvisabososom.pdfIn PDF document text
    • http://ymjgolf.com/file_media/file_image/file/tevuditidiraliwopuxedov.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/c683c0acb1e644cc7ac453a5b89b1be1/17673144371.pdfIn PDF document text
    • http://aitrans.cn/UploadFile/file/F1202106191000246488.pdfIn PDF document text
    • http://ls12368.com/userfiles/file/48215514381.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a983dd8b722---mimiwefewulez.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/aca9cd64b4c877fe31f4c9cec2de3888/85864901769.pdfIn PDF document text
    • http://findusafranchise.com/files/files/26442961766.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_off0000db26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB26 19788 bytes
SHA-256: 172ee3f83f0056606bdd0ed4adad4b261c4eeac5f835f6f86192d55dd68edbfb
font_01_sfnt_off00010e6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E6D 10884 bytes
SHA-256: 50cd9dab83afae955bacb8b03781d4802deb7e9b0356cdc34858cbcc13a85ec3
font_02_sfnt_off000127d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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