Malicious PDF — malware analysis report

Static analysis result for SHA-256 5868ba591c2403a7…

MALICIOUS

PDF

80.9 KB Created: 2021-11-13 13:38:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 1ec8eaf664643fc16b7335e0655778dc SHA-1: 979034c39de030deed7a8ef4e918b4dc1bec34c2 SHA-256: 5868ba591c2403a72a6360d1e35da1ab4cf00bd8b37445ed3a5fa040dcb0048d
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristic firings and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://nordavril.com/userfiles/file/mafukalijezedo.pdf In PDF document text
    • https://boucherienabli.com/uploads/FCK_files/file/dogapijidusitowevedisiroj.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/ckfinder/userfiles/files/fidozisemapexireze.pdfIn PDF document text
    • https://perfumes.dropship-tracking.com/userfiles/files/8194111662.pdfIn PDF document text
    • https://siam-royal-view.ru/data/files/45563508372.pdfIn PDF document text
    • http://zajazd-broadway.pl/galeria/file/wosexojuzagulebinipo.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/casjq57mm52da5d7esa19s2tku/bevevafexenodelu.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/rutokogereri.pdfIn PDF document text
    • http://soc-in.com/data/media/files/69101333045.pdfIn PDF document text
    • http://pronobile.de/catalog/file/pinokepilobisinod.pdfIn PDF document text
    • http://mascotdd.com/file_media/file_image/file/dunamipa.pdfIn PDF document text
    • https://samoinstitute.samoinstitute.mn/uploads/assets/file/kepozolumaw.pdfIn PDF document text
    • http://gzky.cn/dubeite/ckfinder/userfiles/files/20211003_010932.pdfIn PDF document text
    • http://jcbcharpentebois.com/ressource/site-image/files/45863064027.pdfIn PDF document text
    • https://maftplayer.net/calisma2/files/uploads/wudogigatoxejawizoniven.pdfIn PDF document text
    • http://7serve.org/userfiles/file/20211028042238.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/16184feca9593c---92387239066.pdfIn PDF document text
    • http://unitec-egypt.net/userfiles/file/sefagemonigon.pdfIn PDF document text
    • http://wamer.org/userfiles/file/1359847699.pdfIn PDF document text
    • http://westfield.qa/multimedia/userfiles/file/83581842707.pdfIn PDF document text
    • https://crv.dascalita.ro/app/webroot/files/userfiles/files/54772778070.pdfIn PDF document text
    • https://prokoncept.hu/admin/blogfck/image/file/duxikinawutu.pdfIn PDF document text
    • https://emotionalgift.com/ckfinder/userfiles/files/pabofapepirefunajuvefag.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/5ac30c7110ddd2e4b08141c07e459525/xojijixewumax.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/2c969874308c8017e954f06f731671ae/64622712669.pdfIn PDF document text
    • https://bazab.ru/ckfinder/userfiles/files/73443398988.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/oscUj7J0Gjw/uplcv?utm_term=apa+style+end+referencePDF 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_off0000d2ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2EF 16540 bytes
SHA-256: 45015263e28dbf00792e0fa83ae0fb9123af5110209f191c00797c49350166ef
font_01_sfnt_off0000ea10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA10 19920 bytes
SHA-256: 47cc8235f3848b91ec9703ce1338f3be43e58beaee8d70f4e7b2e46713c8d52d
font_02_sfnt_off00011dc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DC4 10496 bytes
SHA-256: a1d28c6236089303f9637143a5a771718bda716d89daa0407dc1edb258e5095c

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