Malicious PDF — malware analysis report

Static analysis result for SHA-256 326666a54aabf0c8…

MALICIOUS

PDF

90.2 KB Created: 2021-09-03 14:45:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4cade74ce0ac3e6584dacc2e357ce8a2 SHA-1: d0ea225d9483d85b4bb5c8d41154c55b4d005538 SHA-256: 326666a54aabf0c83515ea209925df6f968d80e48da2ae8af1ed460264091792
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of external links, many pointing to compromised WordPress sites, indicating a likely phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the nature of the links and the PDF structure are consistent with techniques used to deliver second-stage payloads or lead users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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
  • 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://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/e401b6e0888b7f2c1edd96e7bff3d6dc/sifirodi.pdf In PDF document text
    • http://sqc.jp/user_data/editor/ckfinder/core/connector/php/upload/files/xubij.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160788bf499c7c---mivamusakixas.pdfIn PDF document text
    • https://associazionedynamica.it/uploads/file/nigufuvobaj.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9b0d38d13e9cf3f7e118a442d38f5c9f/56439657736.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ab7512e858c---babujiwefilujomuja.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607ffc5ec4a1e---25908362687.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/77514536772.pdfIn PDF document text
    • http://primehorseproperty.com/userfiles/files/1944595420.pdfIn PDF document text
    • https://sportsht.com/userfiles/file/lixobupusevivolarafofen.pdfIn PDF document text
    • http://wwstationery.com/files/file/28918830262.pdfIn PDF document text
    • https://carrieres-pierre.com/userfiles/file/ximavinabevokililunogi.pdfIn PDF document text
    • http://kaztelcom.kz/ckfinder/userfiles/files/matadudajabudexawibibil.pdfIn PDF document text
    • http://herningbadintra.dk/app/webroot/upload/files/jirelujoxosixekodareb.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/cgr6pl1l1mvj9r3ln569nr4rgp/tizijujenofusenotufuju.pdfIn PDF document text
    • https://giga-tronics.com/userfiles/files/65773546838.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/da2183e8f9b555ee76537e34e3c1ae01/14901059310.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608b67dc39b70---31044889093.pdfIn PDF document text
    • http://videofilm-tv.ru/content/File/gijubisaxud.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/99a869ff0c770bbec446ea2880d01608/95382444618.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/33oq0ld299e7oqsgvmgk6en7t6/16381551581.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/26992295892.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16070539c1417c---zopiguzopubuto.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=oracle+java+associate+certification+pdfPDF 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_off0000f869.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF869 18660 bytes
SHA-256: 525e8fef1e526e87784554fc26cdb1e0c5c1b7dde8512962b3eacc97d420baf2
font_01_sfnt_off00012978.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12978 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001418f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1418F 10836 bytes
SHA-256: 11e4e49546be5dc01abdd3787755bf3f0b38817beb62e7b27c44782c03e42ee7

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