Malicious PDF — malware analysis report

Static analysis result for SHA-256 37a866c429d6a95d…

MALICIOUS

PDF

76.0 KB Created: 2021-07-06 12:57:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e15a4633aa6baf517e72370f4cdda54b SHA-1: e42ff9be388319b407ecdfb4ada2e1c1c9ef9642 SHA-256: 37a866c429d6a95dd2d34afab41129c1f775627e8518d188e55fed487383a683
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://edu-mate.kr/_UploadFile/Images/file/5792117071.pdf
    • https://zevkotodoseme.com/upload/ckfinder/files/72425907415.pdf
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/b3e0faa69c950a35546d430ae43cb77a/92992087205.pdf
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/aefpp82odc3hc6c66sn8msfe64/64554682183.pdf
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/13b1a4200750aa312fb85f114ca7eab8/lozapawebemudefedekisap.pdf
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/3tt13nr9n181cds00c2jelao42/rovegixamesagoxalinidira.pdf
    • http://vivatbacchus.hu/files/file/lesejodumuvogujar.pdf
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076fa283243d---paguzufoses.pdf
    • https://promise-land.com/upload/file/tetezujagapowazirotodos.pdf
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160961040e6e1c---poneku.pdf
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b40e2cd2921---46008231954.pdf
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1c3586d53e---52548895515.pdf
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/8a293341afd1473e6df1133a8d9cc855/58584760083.pdf
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160973c1d8d6dc---gakowifuzasuxubupatux.pdf
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/0cd5394300d896886d5744c7e3a1cea7/tekilepaloj.pdf
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/889e6d608733eab901065b93de0b4567/97396179013.pdf
    • http://svaz-podnikani.cz/files/file/nosadepunaf.pdf
    • https://vivaldiroberto.com/img/files/mediafiles/file/604894128.pdf
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160813617be0fe---gilexavotitifuvilo.pdf
    • http://cottoneauto.it/userfiles/files/lugulovojoponufovijera.pdf
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a52a54285da---97543651491.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=this+feeling+lyrics+the+chainsmokers
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cbe6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCBE6 16792 bytes
font_01_sfnt_off0000e3fd.bin
f709a880dc46577fd17c9b4ffc7bf9bc086ad8ebb63cf5811eca75c097f95d2a
pdf-font-stream PDF embedded font (sfnt) at offset 0xE3FD 10952 bytes
font_02_sfnt_off0000fd41.bin
91264759cd99cc2e80a22a54e512be36f44b7c549212a04f51a8ef78fe4050df
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD41 15840 bytes