Malicious PDF — malware analysis report

Static analysis result for SHA-256 cff3c88a03c036cb…

MALICIOUS

PDF

83.9 KB Created: 2021-10-08 06:38:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: f04ba8be435e2585fa4c09b59931ab3f SHA-1: 73ad02ea096259bc9a79b36996743d1cf8c641af SHA-256: cff3c88a03c036cbabd33f7318bc4b197fcc3643e2feaff32e0f32761f581487
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many hosted on compromised CMS platforms, suggesting a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with a malicious link farm designed to lure users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://chcial.ru/uplcv?utm_term=colors+red+orange+yellow+green+blue+purple+pink PDF link annotation
    • http://dnt-mayak.ru/content/File/53608854849.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/e51f2d43640d38e0d2e5ea34e1bb9bc0/govumuzanatenejatubawefi.pdfIn PDF document text
    • http://mingzhicc.com/userfiles/files/turidudugipido.pdfIn PDF document text
    • http://4bx.pl/public/file/pifakolutuzutagefibikulun.pdfIn PDF document text
    • http://forspeed.cz/ckfinder/userfiles/files/pifibinawoxunuzuzax.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/71286726772.pdfIn PDF document text
    • http://nandishoverseas.com/UserFiles/File/74794877000.pdfIn PDF document text
    • http://apsencollege.org/test/fckeditor/file/panizedumuwezavu.pdfIn PDF document text
    • https://mimpisiluman.com/contents/files/bavazuworefirojenomenofob.pdfIn PDF document text
    • https://dsverano.com/UserFiles/File/tajorafeloxuvoridudojube.pdfIn PDF document text
    • http://lawngo.net/fckfiles/26448593367.pdfIn PDF document text
    • http://gernano.eu/gfx/userfiles/files/497441702.pdfIn PDF document text
    • https://simbhaolipower.com/images/file/xogimuwoziluvarejulepilan.pdfIn PDF document text
    • http://purofirstli.com/userfiles/files/94735071005.pdfIn PDF document text
    • http://atek-ent.com/upload/file/82169741747.pdfIn PDF document text
    • https://varida-tech.com/ckfinder/userfiles/files/voxedumisisivotef.pdfIn PDF document text
    • https://nhatngudongkinh.phapluatvietnam.com/upload/ckupload/files/pabazufunafeb.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/4377071f166e6bf5a629d20944c6ee2c/kawobipujer.pdfIn PDF document text
    • http://aostavet.it/userfiles/files/murowalajoduribikexaz.pdfIn PDF document text
    • http://cerrutistudio.eu/userfiles/files/3793071626.pdfIn PDF document text
    • http://e5tbr2.alruaa.com/ckeditor-ckfinder-integration/uploads/files/ligudezujofuxejufuz.pdfIn PDF document text
    • https://krzczonowice.pl/gfx/file/vetaf.pdfIn PDF document text
    • http://ashokarefrigeration.com/userfiles/file/luparuvizinolewozavo.pdfIn PDF document text
    • https://pleasanton.com/wysiwygfiles/file/81093825669.pdfIn PDF document text
    • http://haiqi-machine.com/d/files/23532661567.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16150de017c37d---wopuselasi.pdfIn PDF document text
    • http://wjcopy.com/upload/files/zavenavazot.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_off0000e292.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE292 17528 bytes
SHA-256: 7c7db23fdb22a7cdcab8526eb3e1dc4610725fda3681180cb370f7b8c7d09bc9
font_01_sfnt_off00010f8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F8D 11032 bytes
SHA-256: c3b27a9c1e073adc3cec7e16ee6aadf9b1fcd325f0a907cc159cddce9195d0c6
font_02_sfnt_off000128f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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