Malicious PDF — malware analysis report

Static analysis result for SHA-256 190db8c3209a44b4…

MALICIOUS

PDF

83.8 KB Created: 2021-09-17 10:15:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2464114006e9238e2a727f7701598594 SHA-1: 81ffbb86d0a22127609e6efddc223b109021d115 SHA-256: 190db8c3209a44b463afeafc3720b524bdebd136a5eddbe63f9d05b64e387568
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using numerous distinct hosts for a link farm, suggesting an attempt to obscure malicious intent. The ML classifier and ClamAV detection strongly indicate malicious content, likely a phishing lure or a downloader disguised as a document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://nhactheducthammy.com/upload/files/mevubikelifiketivasa.pdf In PDF document text
    • https://bakwanudang.com/contents/files/91448848645.pdfIn PDF document text
    • http://ceramkgres.ru/userfiles/file/xaxaduvijopagoje.pdfIn PDF document text
    • http://sfipl.in/userfiles/file/voxetuzupomu.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210908185839_184335865.pdfIn PDF document text
    • http://thucancakoihikari.com/luutru/files/99888801341.pdfIn PDF document text
    • https://marljivo.hr/UserFiles/files/69753545286.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/38700844155.pdfIn PDF document text
    • http://www.johnrealestate.in/ckeditor-ckfinder-integration/uploads/files/16913396012.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/16138a4ef82ee7---topapifonolukisipujima.pdfIn PDF document text
    • http://ronaldtan.nl/images/photo/50346866201.pdfIn PDF document text
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/rutotowutupulifa.pdfIn PDF document text
    • http://recepti.plovdivweek.com/js/ckfinder/userfiles/files/wafamupoxup.pdfIn PDF document text
    • http://artospace.com/pics/file/81298656518.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a151ccb476---8696354901.pdfIn PDF document text
    • http://xn--h1aeekk.xn--p1ai/files/file/kifodenifuzak.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143e9c38a5a3---varukisufoluligurejuk.pdfIn PDF document text
    • https://amadesafar.ir/basefile/amadesafarir/files/xajikuduliji.pdfIn PDF document text
    • https://marljivo.hr/userfiles/file/fidurut.pdfIn PDF document text
    • https://shturnev.com/files/foFKED/file/vatijodolanarij.pdfIn PDF document text
    • http://box8websites.com/ckfinder/userfiles/files/tenodivevafanepafepup.pdfIn PDF document text
    • https://rlmahtani.com/userfiles/files/5602607333.pdfIn PDF document text
    • http://matras-devison.ru/upload/file/xarag.pdfIn PDF document text
    • http://parateam.cz/file/dibujesurixivasapelodovo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=rich+dad+poor+dad+download+for+freePDF 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_off0000dc1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC1D 10584 bytes
SHA-256: cbc7aa567dd3195b9c74f65cb3e5fc12403c84a53dfbe330a2fb42a50c2d7004
font_01_sfnt_off0000f438.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF438 20116 bytes
SHA-256: ddbc32c5ee537772335f1e9fc7908d96cb33415cdcb0556b974d489ecbcc6f84
font_02_sfnt_off00012914.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12914 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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