Malicious PDF — malware analysis report

Static analysis result for SHA-256 51751f7f05f6888b…

MALICIOUS

PDF

83.5 KB Created: 2021-09-13 13:19:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 28ceae7083886beb3f7fecaddef4f98c SHA-1: be8ed42fe8c17f1d858090db881094c4b16deed0 SHA-256: 51751f7f05f6888bfa73bd2166aa5ee633ae6c823d4110ac33cd571d3906ecd1
176 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to compromised CMS upload directories and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the true destination. No scripts were extracted, but the overall structure points to a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://thebeautyofdesign.nl/ckfinder/userfiles/files/tejonurelagoxikuwunetike.pdf In PDF document text
    • https://ibexquimica.com.br/ckfinder/userfiles/files/xepumabakefuzizet.pdfIn PDF document text
    • https://basisnomor.com/contents/files/90650416628.pdfIn PDF document text
    • http://alsace.annuaire-regional.com/ckfinder/userfiles/files/99822071608.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/161330bceda96e---riloziwubiwodolojawudijot.pdfIn PDF document text
    • https://suavitinhtannha.net/upload/files/48993799284.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/7cc50f2797f24ded98163a0a60237aa5/59906653840.pdfIn PDF document text
    • https://panama4d.com/contents/files/jidaxanunuxipebiwukipo.pdfIn PDF document text
    • http://veterky.ru/ckfinder/userfiles/files/zebivuki.pdfIn PDF document text
    • http://rivebistro.net/ckfinder/userfiles/files/31322028304.pdfIn PDF document text
    • http://zoldjogsi.hu/uploads/files/dazile.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/29cc3eacd0871af83779cbc2515683be/15841992185.pdfIn PDF document text
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/medufinedobo.pdfIn PDF document text
    • http://www.espaciocultivarte.com/ckfinder/userfiles/files/49364805804.pdfIn PDF document text
    • https://kurtoglumob.com/upload/file/niwurofufomumok.pdfIn PDF document text
    • http://mavelikaradiocese.org/rapha/ckfinder/userfiles/files/9578438430.pdfIn PDF document text
    • https://cosmopolitanhotel.lastrada.bg/uploads/wysiwyg/files/57718493129.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/d175761db7290b27d9feff693c3c7c96/vizewibotiwa.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/fs8t63m8t16gdbjb8c1jp8dla7/rejowudosuguwawarires.pdfIn PDF document text
    • http://tl-maskinfabrik.dk/userfiles/file/mawejokiwowizimulanelige.pdfIn PDF document text
    • https://fasaac.org/temp/files/42892148293.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/kanilup.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16138bd12b79c4---86254457032.pdfIn PDF document text
    • http://floridadressyourhome.com/uploaded_files/userfiles/files/dodoz.pdfIn PDF document text
    • http://www.nachtruhe.info/up/files/nivozoxekovadosaxa.pdfIn PDF document text
    • https://naucharts.com/ckfinder/userfiles/files/11757613081.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=breaking+dawn+read+onlinePDF 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_off0000e5b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B6 10388 bytes
SHA-256: 2d4c7579c10cbb8988b70095cae9f1f74bcfefe0a89777181a5e0a2b843b8e63
font_01_sfnt_off0000fd22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD22 16688 bytes
SHA-256: b25f50a40934220d2ba19aa46bfe2af593a96fa141803b00ebb112df78f28a51
font_02_sfnt_off0001280e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1280E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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