Malicious PDF — malware analysis report

Static analysis result for SHA-256 806c14c516bfc671…

MALICIOUS

PDF

84.8 KB Created: 2021-10-10 09:00:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 83b5925befb4584101fa2f0f80de4b24 SHA-1: 0aa4a79c60e9827b7de666f664ce8c665c78e32f SHA-256: 806c14c516bfc6710e82b7522dacdd9cc49b3ed6ca8e72263987cc147c5a29d9
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm pointing to numerous external URLs, many of which are hosted on compromised CMS platforms or disposable domains. These links are likely intended to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://krisoc.ru/uplcv?utm_term=bard+hs+early+college PDF link annotation
    • https://funke.be/data/file/nogebi.pdfIn PDF document text
    • http://dekoblickfang.de/userfiles/file/94233704299.pdfIn PDF document text
    • http://montpellier-business-plan.fr/mbp/upload/images/images/upload/ckfinder/zibekoxazawuruno.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138cf71b04c0---nurerukesepumo.pdfIn PDF document text
    • http://nusratali.com/userfiles/files/28126022640.pdfIn PDF document text
    • http://xn--80aejmo0alc.xn--p1ai/ckfinder/userfiles/files/70826419413.pdfIn PDF document text
    • http://haiphongcontest.com/images/files/78688254458.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/76c5c7400c704ed4c632c288870a896b/60029284961.pdfIn PDF document text
    • https://www.studioline.ie/ckfinder/userfiles/files/59111224648.pdfIn PDF document text
    • https://ozmutludokum.com/userfiles/file/jemuvip.pdfIn PDF document text
    • https://brincandoeaprendendo.com/fotosempresa/files/jipukuriximetise.pdfIn PDF document text
    • http://seatraveltx.com/uploads/files/mojix.pdfIn PDF document text
    • http://kernenshepler.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/71449636021.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615b95bcbee98---41198822112.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614050ef9bc6e---dubuzodabigafop.pdfIn PDF document text
    • http://studiotecnicodama.it/userfiles/files/59541251537.pdfIn PDF document text
    • http://munnartourism.com/uploads/file/xojoluxajatiwifiwomowubis.pdfIn PDF document text
    • https://sportsslife.net/upload/ckfinder/files/61076761097.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615e5d00e0c41---mugowekelidukurelodoxilav.pdfIn PDF document text
    • http://geostudio.eu/userfiles/files/wukazurug.pdfIn PDF document text
    • https://kidneystonetreatment.in/userfiles/files/xowadinolujevowaxopate.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615d50d960551---35538232231.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_off0000e010.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE010 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f827.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF827 10524 bytes
SHA-256: f3dd3267ca7e1fb036820d78470ef8d100afd58980c945888bcfef94b997ab2d
font_02_sfnt_off0001100f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1100F 20400 bytes
SHA-256: d2e99fc182b80f28264083988c84974668c29c9117e93a1ce5fd54e63d54a6da

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