Malicious PDF — malware analysis report

Static analysis result for SHA-256 c509b43965d93908…

MALICIOUS

PDF

107.7 KB Created: 2021-09-01 12:58:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ac2d1f1ac55e4887b73932096c27b252 SHA-1: 53c4300ba19d37c62f3db14154146e252af0bda0 SHA-256: c509b43965d9390883704f21df46aceef77afc99724a104ebf553f10a3e8ecf2
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to external websites, many hosted on compromised CMS platforms, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier further support its malicious nature. The embedded URLs suggest the document is intended to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6151

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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
  • 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://crewmak.ru/uplcv?utm_term=how+to+get+3+players+on+black+ops+3+zombies PDF link annotation
    • http://www.amedna.com/userfiles/files/16437184649.pdfIn PDF document text
    • https://mashtalkandil.com/userfiles/file/39725580269.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/160be721905986---tarotuwimugozewinure.pdfIn PDF document text
    • http://zygzak.eu/foto_dane/wysiwyg/File/nuvunig.pdfIn PDF document text
    • http://ukicda.com/admin/fckeditor_upfiles/file/2021081800514380554.pdfIn PDF document text
    • http://elandtour.com/FileData/ckfinder/files/20210825_0F9C0F4FD3FC42C4.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607b464599764---80896217496.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/nmmkn57mcq24q7vr35mjskji41/93373856781.pdfIn PDF document text
    • https://nestaerospace.com/uploads/file/31436281128.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/e452288281b9b49f01b9383fe4fe859b/nojorurobazaduxa.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1611769913b32b---vobixovorezasamenugikor.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160bd7a0a5dbf0---xegositiveba.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/ce1jpcsq4tekae7rtfaj4tan0i/85319337955.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f82c4294a71---mivijevivujeneke.pdfIn PDF document text
    • http://parfumland.sk/upl/rafupegasaratomawuwubale.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/e83747cd82b1d805b48307183fac87d5/radujisetejeg.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160725b1ce2266---73689882076.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c78189df473---solilerabopenixukeweju.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160878c81d6b08---laxupidaziwepogebove.pdfIn PDF document text
    • http://xn--b1adcbbai1bezln.xn--p1ai/content/File/52895998209.pdfIn PDF document text
    • http://jaatkinson.com/userimages/68912975060.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00017f07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17F07 11372 bytes
SHA-256: f860aa5fc6720c7a57ae3d4b5ac933f9ef3137c38589f0e36ee96663ee5610c5
font_01_sfnt_off000199bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x199BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1