Malicious PDF — malware analysis report

Static analysis result for SHA-256 e233b74f33028adc…

MALICIOUS

PDF

78.2 KB Created: 2021-09-13 10:05:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 72033cfe3aa7f94d37b0aeb4216820c0 SHA-1: bc51468ed8d92c71de03a80e16f2b07a66eea8fc SHA-256: e233b74f33028adc414803a6051fad19f435795da8bf4c3527a26aec692c3a1c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and numerous external URIs. Several heuristics indicate the PDF is part of a link farm, with some links pointing to compromised CMS upload directories. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or SEO abuse.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 https://medvor.ru/uplcv?utm_term=how+to+transfer+photos+from+android+to+iphone+with+computer PDF link annotation
    • http://precisao.net/files/files/gekovovunewomudekob.pdfIn PDF document text
    • https://rajatotogroup2.com/contents/files/nirixeximulasofezu.pdfIn PDF document text
    • https://mimpishio1.com/contents/files/ranukomuki.pdfIn PDF document text
    • http://studiosimonepantaleo.it/userfiles/files/48021537584.pdfIn PDF document text
    • http://isotope3.pm-ural.com/uploads/files/16147143662.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16139aa74a218e---folel.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161390ae4591ef---51701853067.pdfIn PDF document text
    • http://teleserviciomalaga.com/ckfinder/userfiles/files/bigirigubudanuzebiku.pdfIn PDF document text
    • https://prestinireedcorp.com/userfiles/files/fofazesimusitejoxixetotuj.pdfIn PDF document text
    • http://rosabaum.de/web/editor/files/nuzixefovelobewer.pdfIn PDF document text
    • http://owop.challengersports.com/ckfinder/userfiles/files/98897449770.pdfIn PDF document text
    • https://agriplan-rs.com/dados/ckfinder/files/3194206453.pdfIn PDF document text
    • http://mmbassisiprovince.in/files/js/ckfinder/userfiles/files/7960269126.pdfIn PDF document text
    • https://ideylia.fr/uploads/file/kifomofekomuviv.pdfIn PDF document text
    • http://qkmedica.com/uploads/userfiles/file/96909655784.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1612f057b80fc2---91667024410.pdfIn PDF document text
    • https://ego-sofa.tw/uploads/files/202109040917064662.pdfIn PDF document text
    • http://noahmission.org/dataroom/file/98284608873.pdfIn PDF document text
    • http://architettoangeli.it/userfiles/files/58621703966.pdfIn PDF document text
    • http://www.vljainandco.com/userfiles/files/gelakapizule.pdfIn PDF document text
    • http://www.de.ruben.pl/ckfinder/userfiles/files/88575358543.pdfIn PDF document text
    • https://nirmalujjwal.com/public/ckfinder/userfiles/files/41027584113.pdfIn PDF document text
    • http://paraglider24.de/pics/fotos/1/file/dalewawususefusoso.pdfIn PDF document text
    • http://singer-island-condos.com/userfiles/files/zimeteduvosonirajopezo.pdfIn PDF document text
    • https://itscebu.com/upload/file/20210902190635.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_off0000cb0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB0D 11016 bytes
SHA-256: 9f0e2f4d494da043f26b6a34eacb05438d3a91a81c4e8b56a76f9f94e4ee93e0
font_01_sfnt_off0000e47f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE47F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fc91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC91 17968 bytes
SHA-256: 5bcae8963746a3054c966cc0ae780c659afa474934f33f02a68b38e231f1a037

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