Malicious PDF — malware analysis report

Static analysis result for SHA-256 bccbb6c1c1ac37a6…

MALICIOUS

PDF

71.8 KB Created: 2021-10-03 09:42:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 4d12eb9e1300f784a547d7783491de65 SHA-1: c73e5be805e0ffe5973ae795fceb2880fee8c2c6 SHA-256: bccbb6c1c1ac37a6d2e1cb1ed05bdb900f2e0c31b1fac60c5d0a51cdfe536f48
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to compromised WordPress uploads and other disposable hosting, suggesting an attempt to distribute malicious content or conduct phishing. The document body is heavily obfuscated and unreadable, providing no further context on its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://mavelikaradiocese.org/rapha/ckfinder/userfiles/files/mosutasawotupojotepata.pdf In PDF document text
    • https://onwater.my/uploads/file/90502764036.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/24714594631.pdfIn PDF document text
    • https://www.borzabadi.com/ckfinder/userfiles/files/83941136940.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/vsjgoaso0hulvcin11pfc3h3l2/jesakuwarabudum.pdfIn PDF document text
    • http://bacsiha.com/public/ckfinder/userfiles/files/58440692173.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133978b6aab4---85217085931.pdfIn PDF document text
    • http://xn--4k0b43gkwo4gn.com/upload/editor/file/bofej.pdfIn PDF document text
    • http://hcm-invoice.vn/hinhanh_fckeditor/file/fefupezu.pdfIn PDF document text
    • https://kingcarmotorista.net/uploads/files/99805170887.pdfIn PDF document text
    • http://superfasttv.com/uploads/files/732150249.pdfIn PDF document text
    • http://www.bufolari.com/public/immagini/file/28933069084.pdfIn PDF document text
    • https://vietnam-pump.com/userfiles/file/bufinitaluvoxekowe.pdfIn PDF document text
    • http://grafitym.kz/files/file/repepepapitugabifedun.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/53e3889f4c31e2d184b38543c7f2bf49/lidomiguzesudasodug.pdfIn PDF document text
    • https://www.igescanada.com/ckfinder/userfiles/files/nadipododoxudomi.pdfIn PDF document text
    • http://ippon.lv/uploads/File/xutunafasunizetola.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/9957852896.pdfIn PDF document text
    • http://bodybybodyology.com/ckfinder/userfiles/files/jewevaxupemubipopopulume.pdfIn PDF document text
    • https://www.bramfordgc.co.uk/ckfinder/userfiles/files/wudezavuviz.pdfIn PDF document text
    • http://aotwresort.info/ckfinder/userfiles/files/23174358350.pdfIn PDF document text
    • http://futureinfashion.com/ckfinder/userfiles/files/43121081110.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=brother+in+german+languagePDF 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_off0000b235.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB235 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA47 18588 bytes
SHA-256: c3a957bc213634ea14866871c80e15d77bc093be91a0fad4221a76271ac66ef9
font_02_sfnt_off0000fa25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA25 10540 bytes
SHA-256: bfb8ace93886a3466fc6d2317bdd66f21417e821d71046042bcddeca0e15c1c5