Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b8ae1e392b3f670…

MALICIOUS

PDF

74.8 KB Created: 2021-09-16 21:16:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 723b39716b1c5b6df40a9f3cd1dc5a8c SHA-1: ef3a7acaeef88ae150f62e4a47f1a0fab7dde793 SHA-256: 0b8ae1e392b3f670783e73d7e6d1e2d304c7949a05267561ea18cb8e4a439e20
124 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV with a 'Pdf.Phishing.Trojan' signature. Static analysis reveals numerous embedded URLs, many pointing to disposable hosting or compromised CMS upload directories, indicative of a link farm designed to redirect users. The presence of these links and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4750

Heuristics 5

  • 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
  • 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://oniceh.ru/uplcv?utm_term=data+counter+widget+pro+apk PDF link annotation
    • http://image.dlib.vn/libedu/news/bachviet/20210915/file/63142832334.pdfIn PDF document text
    • http://bunny888.com/ckfinder/userfiles/files/64356863294.pdfIn PDF document text
    • http://ministryofrum.com/memlogos/file/kodoniker.pdfIn PDF document text
    • https://kuepancong.com/contents/files/98480064625.pdfIn PDF document text
    • https://fotofidelity.cz/userfiles/file/54209208217.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/daa5e27659a774d431009647996d0fa0/33360875327.pdfIn PDF document text
    • http://rw-hse-businessconsulting.de/userfiles/file/ruxepekax.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613891d79f25c---70581737305.pdfIn PDF document text
    • http://kanoonkaraj.ir/dbmanager/filebank/htmlgallery/file///mafugudifosetopafexilene.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/enhjljc0om9jts5sklrj1j1jr4/sinobep.pdfIn PDF document text
    • http://siciny.eu/userfiles/file/luneniladiwozulo.pdfIn PDF document text
    • http://studionegrelli.it/userfiles/files/nipezuxofiguziwekizepaji.pdfIn PDF document text
    • http://cissi.it/userfiles/files/bivazodo.pdfIn PDF document text
    • http://morethancars.nl/uploads/edytor/file/jodasiga.pdfIn PDF document text
    • http://celesteandtorsten.wedding/images/file/dolotose.pdfIn PDF document text
    • https://imihwa.com/uploads/image/20210901/files/20210901211709.pdfIn PDF document text
    • http://zuche0551.com/upload/file/wilatu.pdfIn PDF document text
    • http://dohertylaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/32214922333.pdfIn PDF document text
    • http://greenglobepms.com/uploads/93970139018.pdfIn PDF document text
    • http://fu-xin.tw/uploads/files/202109090936111003.pdfIn PDF document text
    • http://shop-cartuning.pl/userfiles/file/25119290434.pdfIn PDF document text
    • http://minhanh.com/files/92884564678.pdfIn PDF document text
    • http://zhodnoceni-penez.cz/is/images/FCKeditor/File/podabisaruzutuvojorikabo.pdfIn PDF document text
    • https://at2-turbo-j3t.com/contents/files/2507971347.pdfIn PDF document text
    • https://cakamuzejs.riga.lv/ckfinder/userfiles/files/64157469071.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d717.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD717 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF2E 10752 bytes
SHA-256: 94729aa330497fa007fab358e22df755f58495cc051a9a784feb742f1bd62db9

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