Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e51dbca0e202fc1…

MALICIOUS

PDF

71.3 KB Created: 2021-09-17 21:16:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 38644c970978bd454a5b78da248f3a69 SHA-1: dfc100b80858be787e9301cdac6fc0b77e0aed29 SHA-256: 0e51dbca0e202fc18d7b555b197d85beb7e3298aa9b2276d27c281022a1268c6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or are part of a link farm on disposable hosting, suggesting an attempt to obscure the final destination. The presence of these links and the overall structure indicate a likely phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/5562e6d0e24f62e08e2eca524a1e74fb/suvivarimibopisaboluju.pdf In PDF document text
    • https://amadesafar.ir/basefile/amadesafarir/files/55787598363.pdfIn PDF document text
    • http://sethhukumchandschool.com/userfiles/file/siteletele.pdfIn PDF document text
    • https://dentalrud.com/userfiles/file/nazanufixivejosubiropuxa.pdfIn PDF document text
    • http://rtm-plus.com/ckfinder/userfiles/files/laboseverilevomipigi.pdfIn PDF document text
    • http://gonvvama.net/filespath/files/20210909181049.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/38905165964.pdfIn PDF document text
    • http://compagniaviaggi.gattinonimondodivacanze.it/themes/userfiles/files/vabitodexerazenemufefub.pdfIn PDF document text
    • http://ms-beauty.com/ckfinder/userfiles/files/zaxiwovapetasutofazo.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/161445e4c433e5---zitisulen.pdfIn PDF document text
    • http://atrsara.ir/resource/files/fokusejiporusoz.pdfIn PDF document text
    • https://tramtron.vn/uploads/files/files/3925335306.pdfIn PDF document text
    • http://hueide.com/upload/files/xegozesewi.pdfIn PDF document text
    • http://metall-press.ru/files/sefapekeladexokubed.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/16143cb52e9706---zinigukepiposos.pdfIn PDF document text
    • https://woodfur.in/userfiles/file/joduruwefedevubufar.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files/50679327037.pdfIn PDF document text
    • https://umutfm.com/resimler/files/94416153350.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/161350288bb879---mewaneduwekaruxere.pdfIn PDF document text
    • http://aquamedia.cn/ckfinder/userfiles/files/25245093285.pdfIn PDF document text
    • http://expnavi.com/sites/all/sites/default/files/file/venirapexisugewapeg.pdfIn PDF document text
    • http://tksvolga.ru/userfiles/file/68908954327.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/a78f749f2940c44820484f0d1602106c/dapekuguta.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=get+500+followers+on+instagram+every+hour+by+malik+vasidPDF 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_off0000b4d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4D1 11692 bytes
SHA-256: 6809ef320df55fb31758d531bb090d13a0d1f258e7bd0c1235c854346c0af1f6
font_01_sfnt_off0000d067.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD067 15404 bytes
SHA-256: c7be10610724b5a6cb5adebf327564a5fc18848bfc2a32f741129efa6fd7d14e
font_02_sfnt_off0000f740.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF740 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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