Malicious PDF — malware analysis report

Static analysis result for SHA-256 09cc31ebba570c3b…

MALICIOUS

PDF

82.6 KB Created: 2021-09-18 21:29:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 353255a27413f9ec7623776af588c296 SHA-1: 34f3ff25556bbf5e373dc6f97d9923c26ac22e31 SHA-256: 09cc31ebba570c3b1057f2315ca719d575206c5200cc73dfb66b1f194d8582c7
196 Risk Score

Malware Insights

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

The file is identified as a malicious PDF by ClamAV and an ML classifier. Heuristics indicate it contains links to algorithmically generated URLs and points to compromised WordPress upload storage, suggesting a phishing or malware distribution lure. The PDF's structure and embedded links are consistent with attempts to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • 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
  • 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://mayphoviet.com/media/ftp/file/masitimapoxajevel.pdf In PDF document text
    • http://hagakure.by/upload/editor/files/zofidagituwodudum.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161462dd673d64---79371386779.pdfIn PDF document text
    • http://canavesiobruno-architetti.it/userfiles/files/25219234872.pdfIn PDF document text
    • http://deccanquest.com/konadnew/userfiles/file/kixufivikirisiluxemukiku.pdfIn PDF document text
    • https://zakarpattya-tour.com/upload/xokidigudatuw.pdfIn PDF document text
    • https://rmp-traueranzeigen.de/cms/files/tirinabinumedurajirebodi.pdfIn PDF document text
    • http://futimisdev.com/userfiles/file/24918548818.pdfIn PDF document text
    • http://vip-cond.ru/userfiles/file/73872965156.pdfIn PDF document text
    • http://industrialsupplies.pk/userfiles/files/93247460564.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/d6310227b5e02657ad8214e7951e0d4f/15569515981.pdfIn PDF document text
    • http://kasintorn.com/images/upload/files/xaxeregidazarulate.pdfIn PDF document text
    • http://clinicaveterinariacittadivignola.com/userfiles/files/nobejimerupesadutimux.pdfIn PDF document text
    • http://abwrichmond.com/uploads/files/68059825187.pdfIn PDF document text
    • https://derfo.info/resimler/files/guzefuze.pdfIn PDF document text
    • https://marblobathware.com/app/webroot/img/files/fuwewofuxej.pdfIn PDF document text
    • http://ljsmelt.com/upload/files/13124641710.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae3ea131f6---delipodozutevofamavagit.pdfIn PDF document text
    • https://lanhcongnghiepthinhphat.com/upload/files/jigokebuxuzesivuvewew.pdfIn PDF document text
    • http://fipjp.com/userfiles/file/bugevikosopudar.pdfIn PDF document text
    • http://churchontherockuk.org/home/churchontherock1/public_html/userfiles/files/62358828968.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=mad+scientists+club+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_off0000da4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA4E 10628 bytes
SHA-256: c380cf0d55ece5529110bab49023564d6e40c30cc2b80d151e291b42ec9590a9
font_01_sfnt_off0000f27c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF27C 18996 bytes
SHA-256: 3d807769fa6d7107ceb80396357076c89bef3de585372873c0c57b3e8523670f
font_02_sfnt_off000124df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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