Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf8010fb92ea68cb…

MALICIOUS

PDF

72.7 KB Created: 2021-07-19 12:11:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0b3d7677f9bdeecbba290377c4c30142 SHA-1: ce814ebf17395a9a0c22f8f23bba4bec1e66cc5d SHA-256: cf8010fb92ea68cbd43f005c75e2ee3d60394c506a592b0293cfab644f2d6392
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload directories, indicating a link farm designed to redirect users to potentially malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a common phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/e8c879fbaca991ae809f3fa9c8336233/37126718603.pdf In PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/b6889b66ba75174c2fdef58828c52418/rirafunumukut.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cb4196faa5---gelerofuzunudijujegapewe.pdfIn PDF document text
    • http://malopolskiszlakwinny.pl/upload/File/83794087043.pdfIn PDF document text
    • http://seabeachthailand.com/UserFiles/file/watofulirodinonowuv.pdfIn PDF document text
    • https://toskov-yordanov.com/userfiles/file/nijubipajivobo.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160bb5e9d99b4d---27145141562.pdfIn PDF document text
    • http://interel-rus.ru/test/sites/default/files/file/30117045141.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/33c780505fc76e56c31b26e6f5a49de1/12800957629.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c66793ae6e1---dexenesakibiweka.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/4da9ab1dae087e3172b1509c61497b63/lurowujod.pdfIn PDF document text
    • https://flardochform.se/userfiles/file/zutetikerudusedu.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/mgh9fga53v21a95lfns27ld0ft/wuxotivozivej.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/dipokijujovom.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a971af1f71e---31997147350.pdfIn PDF document text
    • https://ayurvedaemart.com/uploads/file/43418910289.pdfIn PDF document text
    • http://saipanbooking.com/FileData/ckfinder/files/20210713_48FEEF5A3C4772D4.pdfIn PDF document text
    • http://luatsuphutho.com/upload/ck/files/58453907533.pdfIn PDF document text
    • https://terminal.hr/userfiles/file/wijebirekajutixawukovo.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4588c10f1---guxaninosalebebovo.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160991350283d1---nasovuponej.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160bc98ec6d299---mowopifinafajasawenizipi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=converting+square+roots+to+exponentsPDF 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_off0000bc5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC5C 10824 bytes
SHA-256: f85f82ae29c4c4d4f7e8c067c770a93c84eb125ff2b19b4871e44e7c04434fe0
font_01_sfnt_off0000d53a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD53A 15620 bytes
SHA-256: fc531637cfb70475e689396702c1217527811ac968ee2b80c46a6f19874e2f27
font_02_sfnt_off0000fd8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD8E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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