Malicious PDF — malware analysis report

Static analysis result for SHA-256 542904597a59fb76…

MALICIOUS

PDF

83.7 KB Created: 2021-07-06 20:48:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: fe9a7c801f710f3b3d02d8452a2bab68 SHA-1: 49b55523ef1a7a8aca29fe2f9ddf1a26c6db8370 SHA-256: 542904597a59fb76c7a61a3976b97b45dfa5eca19936772ff98cea4dce636fda
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many of which appear to be hosted on compromised CMS platforms or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent. The presence of PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics suggests a phishing or malware distribution campaign aiming to obscure the true destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://nomylo.ru/uplcv?utm_term=sites+like+tinychat PDF link annotation
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071bd9718a29---99187440002.pdfIn PDF document text
    • http://clubesquilacoma.com/uploads/files/xuvubogezaxegisupu.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/vowalovifewuxorotekag.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/8db7c207c2d74fc465051e722bb14673/felabewapifinusovub.pdfIn PDF document text
    • https://economiadecomunion.net/ckfinder/userfiles/files/fosivugeguj.pdfIn PDF document text
    • http://bethanybaptistcolumbus.org/clients/75549/File/29202551132.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/c93515d614fb9b4ef0412af3ab80f037/vegamazorixejilar.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084279a35f42---fuworu.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///93021927847.pdfIn PDF document text
    • http://vodnik48.ru/content/file/52270672576.pdfIn PDF document text
    • https://transport-vehicules.fr/userfiles/file/1082792180.pdfIn PDF document text
    • http://prvugkh.ru/uploads/files/wuxiwapuridasemunolemoma.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb6019e2bd---36375803620.pdfIn PDF document text
    • https://gymlesgeants.com/upload/editor/file/59620678132.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160806f541ac75---812951891.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ebee313be5---84398271122.pdfIn PDF document text
    • http://hainescentreasia.com/images/file/58470367099.pdfIn PDF document text
    • http://artistalexanderkanevskyroyalshakespeareglobetheatrelondon.com/clientMedia/file/34436940777.pdfIn PDF document text
    • https://badoza.net/userfiles/file/towadenemilenapowa.pdfIn PDF document text
    • http://cherishedmomentphotos.com/clients/8/84/84fe84b553acfcd191e166b7401b6f02/File/raguwuxilo.pdfIn PDF document text
    • https://haysalon.com/public_html/userfiles/file/36813593654.pdfIn PDF document text
    • http://amctop.com/board_data/editor_img/file/202106180043.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/64glh2613b53rojp2d96sjq9i5/725514362.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/p8ogge87ipa67g2kecaik0t7s0/75205677469.pdfIn PDF document text
    • http://safeabortionnepal.com/userfiles/file/66417020367.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160761c08e5b78---38165522278.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_off0000e747.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE747 10388 bytes
SHA-256: 7b8fbebe06031e042ed1f84ea3fe709dd7c8ad85478684f685bbcc943c80d1f4
font_01_sfnt_off0000feba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEBA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000116cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116CC 16072 bytes
SHA-256: 5f2e8ca04674256d274dca05916080437c4450137e83275238b23b23765da035