Malicious PDF — malware analysis report

Static analysis result for SHA-256 7edc19f91f28da2c…

MALICIOUS

PDF

90.2 KB Created: 2021-08-12 17:10:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 33e2dc420e2a322563eb9b4f75014657 SHA-1: 79ab7d46676afd96bf0a1396c07f71e6ea9f095a SHA-256: 7edc19f91f28da2ce9a22597e26a7a7c94256325595a3f61d1ef7b2855ff4408
236 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is flagged as malicious by ClamAV and an ML classifier, exhibiting characteristics of both credential phishing and payment redirection lures. The heuristics indicate it functions as a link farm, directing users to compromised CMS uploads and disposable hosting, likely to harvest session tokens or abuse MFA. The embedded URLs suggest an attempt to trick users into entering one-time codes or approving authentication requests, consistent with business email compromise tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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=how+to+set+aol+email+password+on+android PDF link annotation
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/16098b717c6504---12928363548.pdfIn PDF document text
    • http://celcg.pl/uploaded/file/mejan.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/2tkggneumhq6evsheaao76615e/24419552636.pdfIn PDF document text
    • https://loctra.net/userfiles/file/sitejejononin.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16071a50e54682---11828477974.pdfIn PDF document text
    • http://juliesfundforkids.com/clients/d/d6/d6f17a7a4e9d342a12f8f8eeddb80b2d/File/12599728923.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6bd54d490b---24711678891.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/93040045571.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/59906854991.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160827c301a81e---3748201159.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/hrgt1u6vshbp09r444ddn5vifj/polapililexosewurajemi.pdfIn PDF document text
    • http://distributoram.com/files/file/10411708787.pdfIn PDF document text
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/rinadanopiwapimebidudoz.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/37980016222.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/75a417df94568dceac9e3a04cb072c3c/24602608920.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096277ee334d---28450454597.pdfIn PDF document text
    • http://bradhelferlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/46936787203.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/99195f590d53d3ba2bf02e4b29e5dc9d/paropaxosunolenewu.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2947a1a0fbbe3a2ed754959432b02a41/jupovesuwusuje.pdfIn PDF document text
    • https://hirurgija.me//files/56215290448.pdfIn PDF document text
    • http://randalljroutson.com/clients/44711/File/vaxozilimepewofinizakosa.pdfIn PDF document text
    • http://businessvaluationapp.com//fck_files/file/97920523727.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d35d471871---94258652123.pdfIn PDF document text
    • http://sportschoolindex.nl/images/uploads/jidurus.pdfIn PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/35575a3d43e4acd8abc0a22668940b11/86433933263.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_off0000ff0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF0D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011724.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11724 10632 bytes
SHA-256: e3d892cbca5c0b699a41c8a76eaeca22c776fe39c5169cfad945c68afd271c8a
font_02_sfnt_off00012f6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F6D 16768 bytes
SHA-256: f3490271ee7633b9258dcd74a333a8d9f02ff254ac128e420a86f6aabe1f5cd1

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