Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddceb6a287eef0ec…

MALICIOUS

PDF

76.0 KB Created: 2021-10-03 14:47:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 71efa6f4bd5d66a8099086ff25581f4e SHA-1: b2f68aa72e7cc3fa0fa34d35c26808cf31d4bce0 SHA-256: ddceb6a287eef0ec345f415936153cf0d5ca1e845636049226ff6bf5c4074541
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the URLs and the PDF structure suggest it's intended to lure users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://smidgel.ru/uplcv?utm_term=ndt+methods+and+applications+pdf PDF link annotation
    • https://art4you.sk/editor_uploads/system/files/56509466073.pdfIn PDF document text
    • https://mehregancenter.ir/images/upload/files/80766163356.pdfIn PDF document text
    • http://jca-t.com/fck_image/file/68618602321.pdfIn PDF document text
    • http://novichiha.ru/pic/file/74317712822.pdfIn PDF document text
    • http://cualuoiskydoor.com/webroot/img/files/80712076510.pdfIn PDF document text
    • http://energcomb.net/cms_enercomb/sgi_userfiles/userfiles/files/mevivipadoxak.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/161341705e30b9---dajumid.pdfIn PDF document text
    • http://rajhansnursery.com/userfiles/file/91165316238.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614605a52026f---dipulezineredafukudax.pdfIn PDF document text
    • https://cmottaviproductive.it/uploads/file/53526434196.pdfIn PDF document text
    • https://www.bnbtravels.com/ckfinder/userfiles/files/65735385474.pdfIn PDF document text
    • http://blpest.com/UserFiles/file/73947701473.pdfIn PDF document text
    • http://wych123.com/upload/files/kurobog.pdfIn PDF document text
    • https://aldapa.eus/files/galeria/files/60719868983.pdfIn PDF document text
    • https://apgr.eu/UserFiles/file/57962045460.pdfIn PDF document text
    • http://usateatop.com/_upload/files/nabas.pdfIn PDF document text
    • https://sanaspinler.com/calisma2/files/uploads/zoxiluxuzug.pdfIn PDF document text
    • https://gogift-it.com/userfiles/files/61959662918.pdfIn PDF document text
    • https://xn--80apefbdm9ah5g.xn--p1ai/userfiles/42732929846.pdfIn PDF document text
    • https://art4you.sk/editor_uploads/system/files/94362561302.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/5a688db5a43123398f6ff1e21e98c47b/duduvebarasemumibawemep.pdfIn PDF document text
    • https://serrechevalier-skifun.com/imagesfile/2139426086.pdfIn PDF document text
    • https://stvorki.ru/files/file/2227588513.pdfIn PDF document text
    • http://vector-luczak.pl/new/fck_user_files/file/98659911068.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_off0000be56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE56 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d668.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD668 19620 bytes
SHA-256: 80024f20d2c02f1609ecbee1bbaa701b4df27da0f63719895f4c033c8d337d24
font_02_sfnt_off00010970.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10970 10760 bytes
SHA-256: 1cd027e94495911a3f84a508ffe28b1f5851fbb669ae14f0bc3c227be69564db