Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e5f678dd8e198d8…

MALICIOUS

PDF

74.0 KB Created: 2021-09-06 23:51:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 530a702df2524871ec3ab64b53a18331 SHA-1: b701b29880837394dbcdb9c937f584d3cb4477cf SHA-256: 8e5f678dd8e198d8bc3cb6100606b1332ed7dc56bf22d1ae2b315dcdf055c835
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm directing to multiple websites hosted on compromised CMS platforms, identified by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV also flagged this file as malicious, indicating a high likelihood of phishing or malware distribution. No scripts were extracted, but the structure strongly suggests a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9945

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608356582a6e3---xamejarodizebojowowu.pdf In PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608a34446bc40---jefigew.pdfIn PDF document text
    • https://pilot-nav.com/ckfinder/userfiles/files/87170794439.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c8db61f25f9---89305605828.pdfIn PDF document text
    • http://osheamaloneynylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mulobasufesavaxifo.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/6901056498.pdfIn PDF document text
    • http://milwaukee.center/userfiles/file/pijobikuxufebu.pdfIn PDF document text
    • http://rheumatology.institute/upload/content/file/69299741382.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/89413471598.pdfIn PDF document text
    • http://art-wonders.com/ckeditor/ckfinder/core/connector/php/uploads/files/julisixenafekifamozeg.pdfIn PDF document text
    • http://avrig35.ro/uploads/fck_editor/file/vulekikojawonedufo.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-7-14/20210714092833453430.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/1e6c21a85b1162f7db3f96721477e4d1/womujabewoxe.pdfIn PDF document text
    • https://interstudy.net/userfiles/file/35018748669.pdfIn PDF document text
    • https://wemservice.com/ckfinder/userfiles/files/fobofazufitugijuvekewotef.pdfIn PDF document text
    • https://accidentmatters.com/ckfinder/userfiles/files/47581004651.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160986818461ca---jiretekowobetakozetotab.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086e48ea264d---40382672762.pdfIn PDF document text
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/ruludiketifetizex.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/9dknbuj7h283aqrvju7hr70pth/75974381731.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd8fb94611---78125916911.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16128f3d19b2e8---94644568013.pdfIn PDF document text
    • http://tplustech.com/images/ckeditor/files/gelorukadogibatida.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/dazusabatufu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=hydraulic+turbines+book+pdfPDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/5d05bcef18558352018c649ce375ffac/73192057988.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b841.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB841 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d053.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD053 15304 bytes
SHA-256: c0ffaeb5abb75b7e6602366bdd8ea672d452255376947463a8a200a823551e9b
font_02_sfnt_off0000f705.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF705 1980 bytes
SHA-256: 6acdf68ec99ca3c2a272b9f756ea0534bd524f6b790101e77b8e0f989f3f9b87
font_03_sfnt_off0001000f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1000F 11052 bytes
SHA-256: 95221027609d86d5db33c8ab2ab4801d427bf61ada20415fa7bf258cfedf2b60

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