Malicious PDF — malware analysis report

Static analysis result for SHA-256 d168ce5dfc83a043…

MALICIOUS

PDF

78.8 KB Created: 2021-09-12 06:53:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d3b93173284baab56f8396c64361687c SHA-1: a97a56d9d978457cbfa763e0b05ad19876ea6f10 SHA-256: d168ce5dfc83a043b59163f3ad210552933f7b9889d674886e502de48d8d1f5a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by ClamAV and an ML classifier. It contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm used for phishing or malware distribution. The PDF's structure and embedded content are heavily obfuscated, but the presence of external links and the overall detection profile strongly indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://nycsmindia.org/ckfinder/userfiles/files/pobujirunajudejiwifi.pdf In PDF document text
    • http://ipayon.com/root/FCKeditor/file/30514783879.pdfIn PDF document text
    • https://arabadvertise.com/userfiles/files/gogatadiwit.pdfIn PDF document text
    • https://getadoc.in/ckfinder/userfiles/files/27883381976.pdfIn PDF document text
    • http://matchonusa.com/uploads/files/57180939521.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/tomiseriwewubofofagiti.pdfIn PDF document text
    • http://tg-focus.ru/userfiles/files/texanevafadupotoxax.pdfIn PDF document text
    • https://wolfgang-photography.com/userfiles/files/94428851520.pdfIn PDF document text
    • http://handinks.com/ckfinder/images_store/files/gaxedovuta.pdfIn PDF document text
    • https://alaqart.atelierleuthold.ch/userfiles/files/samiripatuxinixolopufego.pdfIn PDF document text
    • http://dekobonner.de/userfiles/file/befefavadelake.pdfIn PDF document text
    • https://ibeguiristain.com/userfiles/files/fijujigekuwipalesekaxixe.pdfIn PDF document text
    • http://incomingmakedonia.com/files/files/93844508293.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/2c9ea14116e208def6364eca4f5d3ca1/76268187462.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613a08045fa5b---28281623395.pdfIn PDF document text
    • http://falconfam.com/ckfinder/userfiles/files/denibinujexuravefixesi.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/16428859533.pdfIn PDF document text
    • http://lindendirect.com/ckfinder/userfiles/files/vipewusukuresimukagow.pdfIn PDF document text
    • http://luisacortesearchitetto.it/userfiles/files/76698024003.pdfIn PDF document text
    • http://travelbilet.ru/sites/default/files/file/vofukefizeref.pdfIn PDF document text
    • http://omeofest.eu/userfiles/files/70140034156.pdfIn PDF document text
    • http://planbmedia.hu/files/12625339886.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/161388f1f3ec82---motevepisasipisi.pdfIn PDF document text
    • http://www.saletime.gr/admin/fckfiles/file/98835936788.pdfIn PDF document text
    • http://vdavloeren.be/userfiles/files/67243191857.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=creswell+and+plano+clark+2007PDF 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_off0000cd4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD4B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e55d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE55D 17832 bytes
SHA-256: 40adffbc95df30bef05667623b3dd1c07a0d09038cbc517cf251baf16b0bc0a4
font_02_sfnt_off000113f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113F5 10820 bytes
SHA-256: 3828cca48da10601d7e9b2b3428b4f70995fad6ab021f6e2a5a3a06b0cf88848