Malicious PDF — malware analysis report

Static analysis result for SHA-256 b967edd3a8b3db4d…

MALICIOUS

PDF

80.7 KB Created: 2021-09-15 15:11:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 41bc862141df515282c4af903163a94d SHA-1: 52d6c37a385109e98a879840932f860b2037c7c5 SHA-256: b967edd3a8b3db4d249b3e08eea35f0b8a84860c6c6fd9c222c7bebbabfd55a3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that contains numerous embedded URLs, many of which are part of link farms on disposable hosting or compromised CMS uploads, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports the conclusion that this document is designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://philabc.ru/uplcv?utm_term=mcq+research+methodology+pdf PDF link annotation
    • http://rooptex.com/uploads/12496328248.pdfIn PDF document text
    • https://lose-weight.tw/upload/files/fifemofefuloj.pdfIn PDF document text
    • http://orderleesushi.com/uploads/files/dupefazisilotiropo.pdfIn PDF document text
    • http://szybkieprawko.pl/szybkieprawko.pl/user/admin/fck/file/viruduwaxilugu.pdfIn PDF document text
    • http://kerekagy.hu/UserFiles/file/92016306432.pdfIn PDF document text
    • http://gibisch.org/files/files/bufadixiwajaxop.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613faecae8724---25917525727.pdfIn PDF document text
    • https://icoachyou.biz/images/ckeditor/files/37312769793.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/53pt0iruchb8h62v4hvcpsene1/pufoketitugidezexalexej.pdfIn PDF document text
    • http://finpacecuador.com/userfiles/file/xopew.pdfIn PDF document text
    • http://ayrh.internet-match.com/upload/files/nuvomedoresetuv.pdfIn PDF document text
    • http://vibrobeton.by/pics/files/turareboxejuxofemikeket.pdfIn PDF document text
    • http://restaurant-lyons.fr/userfiles/file/89103632961.pdfIn PDF document text
    • http://oryginalnedekoracje.pl/userfiles/file/jojanirakojege.pdfIn PDF document text
    • http://gotoippc.com/ckfinder/userfiles/files/17314595963.pdfIn PDF document text
    • http://fu-xin.tw/uploads/files/202109040759231835.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3ed647d79---logeziwaxisejokufe.pdfIn PDF document text
    • http://nature-revive.org/files/file/lafusomakazex.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/maeppdcqcbfbem33hfutito8ml/65026985722.pdfIn PDF document text
    • http://nanouklid.cz/upload/file/sovabunivagisov.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/saxoduruwobagivogidakanu.pdfIn PDF document text
    • https://perfecthospital.net/FCKeditor/file/nedasulakobotejif.pdfIn PDF document text
    • https://fototipia.hu/files/files/joweda.pdfIn PDF document text
    • https://geniodelweb.com/file/97920727842.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_off0000d677.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD677 17400 bytes
SHA-256: 5404cdb447e96418e90a123ff262d831f69e036ce01aa1b0760e323a5d83bbce
font_01_sfnt_off0001032d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1032D 11124 bytes
SHA-256: 08bb88fb2e268d4a26c9fa8098147e91531cba5205e2417f6d6b378ec9902828
font_02_sfnt_off00011cbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CBF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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