Malicious PDF — malware analysis report

Static analysis result for SHA-256 99e51ebb0a05bac2…

MALICIOUS

PDF

82.3 KB Created: 2021-09-06 18:47:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: fda7459b133544afba58536ac0a38378 SHA-1: 765e1b2a61a1f0a2b96df00c1905f0f02cd9e8c5 SHA-256: 99e51ebb0a05bac2216ab95e65d9955b7ea96bc66054e06250fc3438b7da6f5e
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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://mytekas.com/UserFiles/file/80222865347.pdf In PDF document text
    • http://recviem.ru/img/upload/luvobezetotero.pdfIn PDF document text
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/a9958dd21d0057876461999f4992ef00/46133689644.pdfIn PDF document text
    • http://pdww.ru/ckfinder/userfiles/files/ripafabuwodefe.pdfIn PDF document text
    • https://k-newsletter.com/ckupload/files/56810207058.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b300cf21ed0---rimofilenafanap.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcb6cbc52cc---60641711859.pdfIn PDF document text
    • http://zulassung4you.de/bilder/file/xuzel.pdfIn PDF document text
    • https://kristinanamaste.eu/files/fekilikobawufetojupuki.pdfIn PDF document text
    • https://bibliothequeanglaise.org/upload/files/loxujakowij.pdfIn PDF document text
    • http://ural-kip.ru/admin/ckfinder/userfiles/files/69295500177.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160797bc7567b2---lusufovoloj.pdfIn PDF document text
    • https://kildevangen.dk/files/webubovelolerepafoxadu.pdfIn PDF document text
    • http://nano-vip.com/ckfinder/userfiles/files/jexovepofoxikefato.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/7ac44e29b0978ef81688d72d90adf5a7/bizupe.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/96577821616.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/16120fc01e425e---ponofejoxovanodusazebilu.pdfIn PDF document text
    • https://natatourism.com/userfiles/files/banexinijegadarumizizan.pdfIn PDF document text
    • https://lostfoundglobal.com/userfiles/file/woroso.pdfIn PDF document text
    • https://bibliotheque-des-arts.com/ckfinder/userfiles/files/60707103643.pdfIn PDF document text
    • http://lagunaapartman.hu/images/user/file/74785066828.pdfIn PDF document text
    • http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/roxojawonaduxorizumo.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/97553774087.pdfIn PDF document text
    • http://technocom.pl/editor/file/rewesubifirikogodutu.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/685e3cee2b8f5971c1d0a01c71724bed/66785968011.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=temporale+pr%C3%A4positionen+%C3%BCbungen+pdfPDF 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_off0000d493.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD493 11492 bytes
SHA-256: 28ad6c98245c7d738eb297c4dfe00279c96d6d9858104ea447cd6f2edb1b2e55
font_01_sfnt_off0000ee57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE57 20704 bytes
SHA-256: 968bc56e0c859fa29160c89931f204ec4a3cf0ea1f0eb09c69dd9705cd7957df
font_02_sfnt_off0001218d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1218D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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