Malicious PDF — malware analysis report

Static analysis result for SHA-256 7638d9268d35c007…

MALICIOUS

PDF

87.7 KB Created: 2021-06-26 09:21:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: bb132d6d1b8243739b2ab1b7ee20445b SHA-1: dad6daf18b26d4fb00da7e69bd4f7ab39ccb6f29 SHA-256: 7638d9268d35c0071e68fe817df24e52838d80f888181ea5042cfca440842c77
156 Risk Score

Malware Insights

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

The PDF file contains a large number of links pointing to various external websites, many of which appear to be hosted on compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of numerous links suggests a link farm designed to obscure the final destination and potentially evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://aldo-ins.com/userfiles/file/dupexefometekexi.pdf In PDF document text
    • http://amblesidewindermere.ca/fckuploads/images/file/giturozid.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/417818a1a2af56547b4aebb9602ded32/26359479802.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160973fbec169e---8484091120.pdfIn PDF document text
    • http://colorfulmedia.de/fotki/fotki/file/xevokuwenepeke.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5c210659ea---vawuraz.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/jvko4i66ggphu9q2f2kem0tg32/supebejolikunajimog.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c03eb55db80---zawinuboranijarokudirofup.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7fa403ac6---53964556386.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160870c94a1fe6---53670596460.pdfIn PDF document text
    • http://caratow.nl/userfiles/file/sutumozurukenixuze.pdfIn PDF document text
    • http://arch-teh.com/pic/userfile/tufokulowupazeduw.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160901bb770c9d---ledexibupokubu.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/51357268265.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/80415afe29f6b90dfd3ec330fe0da596/vepafodedivotufe.pdfIn PDF document text
    • http://kppzp.pl/userfiles/file/tumegagux.pdfIn PDF document text
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/vokidumemavazaxawebeluxu.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/f27a289887633cd134e421091f479a2c/lelorojodevamamonamesuwo.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/836e5f4cb08ed239ef7d1eeda1d4f72a/gevafeweru.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c043fc2ccc2---90970727855.pdfIn PDF document text
    • http://zaragozalawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pifezeriwetegoxutobib.pdfIn PDF document text
    • http://bptramptour.pl/files/file/rekoxogarib.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/c036f175791dd05127bb570c4426e281/refukupavovizi.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/69651912126.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=muffin+top+excercisePDF 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_off0000f5c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C9 10460 bytes
SHA-256: cf0d1f32c1253b9ce7a2170dfb980e8200b92200136ec71a8480f0b870e41862
font_01_sfnt_off00010db7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DB7 16888 bytes
SHA-256: 4b8cce867ab6c6a6ae8ab7aa2bafb2f9e840db7f56efef16933d245a2f0b3302
font_02_sfnt_off000139de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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