Malicious PDF — malware analysis report

Static analysis result for SHA-256 e23e7b5d7dd1a806…

MALICIOUS

PDF

80.0 KB Created: 2021-06-25 13:41:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: dc9236a3d5ace89dabaa2f9003a1c826 SHA-1: 88a9250457f214f7036a9651b919911f2532036f SHA-256: e23e7b5d7dd1a806b4df01f7c768291d6d22fdb4fb4847e794776334fc060dcf
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations. These links are designed to lure users into downloading further malicious content, as indicated by the ClamAV detection and heuristic firings related to compromised CMS uploads and link farms. The presence of embedded URLs and the ML classifier's flagging suggest a deliberate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5974

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 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://allytemp.ru/uplcv?utm_term=abalone+guest+house PDF link annotation
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b79e5911fe5---lozim.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/1itg14e0gtpbmbdj8q23ib6lp5/97155221315.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ad12d2a71e9---raxojubadotefelegavum.pdfIn PDF document text
    • http://scales-center.com/shop/fck_file/file/wixegol.pdfIn PDF document text
    • https://2acontractor.it/images/file/81150792185.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abde3c7b26c---jetodamavovojukemeliruja.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/a210ba15128a833a5ccd4b8dbe67ce38/tevuvunudugeloxe.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/47d875527d2640895750b19f15617f04/wotewemurelukomafiz.pdfIn PDF document text
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a08bf7ff2d---gizinapomumuf.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/aba4c6c4f49d401b9b23ee2fd6433703/2946495283.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/04dc62ab02537d692559b8645b4ff9cd/gigoma.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/06d2c84bd22f8c3355cc2e6721379833/69604736676.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/e3e463d52776a1322a90d971bcbc23a1/82271946007.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071bf0abf54e---rofujeg.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/1e24d97e9e00c3abc6ebfcacf67c8b12/jaloxudiwiwoxawejopawaki.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609e632872011---dekavuwugorobasi.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_off0000ecc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC5 17368 bytes
SHA-256: 3d353ca6c6dbbee1d3b9fd74be57f49931a1f51da66eaed04f9c147875dc9594
font_01_sfnt_off00011a2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A2E 10416 bytes
SHA-256: 63b7da04e0fbdc09c9aa0b421038e977e86f22f2ddd370bee6057e8dd03164c5

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