Malicious PDF — malware analysis report

Static analysis result for SHA-256 4383b46bb09bb250…

MALICIOUS

PDF

82.3 KB Created: 2021-08-16 19:10:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f9ef430ec72aa3f55da6c0679c122ef7 SHA-1: 6ececdd70fc85e5df520c5de26236dd416a71c05 SHA-256: 4383b46bb09bb2500e3674598eb046ab5b50e10f86f244133682b7e1d4439c30
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous external links, many pointing to compromised CMS upload directories, suggesting a phishing or malware distribution scheme. The document body is unreadable, but the heuristics and URLs strongly indicate a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/16087d922d4428---81527504793.pdf In PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/f6519bd9d8dc47f222fac39f1677e5f6/6429344969.pdfIn PDF document text
    • https://olympicwroclaw.pl/zdjecia/fck/file/novemamofonevozir.pdfIn PDF document text
    • http://brandweeramsterdamamstellanden.nl/userfiles/file/55581464336.pdfIn PDF document text
    • http://ixtvs.de/_upload_bilder/_filemanager/file/zemagonaxapofuribawimub.pdfIn PDF document text
    • http://challendor.com/fckeditor/upload/file/30518165541.pdfIn PDF document text
    • https://mastirz.com/userfiles/files/50053192175.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abf6a5d5a54---23593846341.pdfIn PDF document text
    • http://dgn89reunion.com/clients/862287/File/21181519595.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/46c37ada2654fa9acc8c7d36fe609527/gowogetiteru.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///gawidogumipinubunolid.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/1d5778481614ec0f3a43a044c352889d/dadiwosikoluzopava.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16119ddb713b7a---mategawewabaka.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/e00e6a0b8a7271719d8c81104a7a297c/44660607917.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/lozulapuxojenojano.pdfIn PDF document text
    • https://ottopianos.nl/files/rafabajibub.pdfIn PDF document text
    • http://owv-sad.de/userfiles/files/woxogezukolaxafomatifa.pdfIn PDF document text
    • http://st-communications.com/ckfinder/userfiles/files/tidezi.pdfIn PDF document text
    • http://chroscina.com/userfiles/file/begojezivuwenujuwibevex.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607823e3e149a---51556897543.pdfIn PDF document text
    • http://didocrosby.com/imagenes/file/69152663952.pdfIn PDF document text
    • http://m-camper.ru/ckfinder/userfiles/files/37215936835.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/93986764613.pdfIn PDF document text
    • https://aimtronu.org/userfiles/file/26752579948.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/16075e36175ba0---setobuli.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+make+strawberry+seeds+growPDF 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_off0000deaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEAF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C6 10772 bytes
SHA-256: 958896399ce88ee71ed184206c2c42b90621352b48e43201d3641fb44dde8905
font_02_sfnt_off00010f76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F76 16860 bytes
SHA-256: 8cfed6108e9e417f252ab2b500260ef0909dfc4b6c083886e8529872c22c8d05

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