Malicious PDF — malware analysis report

Static analysis result for SHA-256 749ad777cc156b07…

MALICIOUS

PDF

82.7 KB Created: 2021-09-03 13:13:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: fbf93f9594413f0318f2e0dcb1b0b149 SHA-1: e6be3b26de9184b776d0f5638bc9c8e39e617b28 SHA-256: 749ad777cc156b07638dbd1df0be6fc7fc88b279b6dbad524579289c2c65dbf5
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The file is identified as malicious by ClamAV and an ML classifier, with high-severity heuristics indicating the presence of random and compromised CMS upload links. These links point to numerous external PDF files hosted on various domains, many of which appear to be disposable or compromised WordPress sites, suggesting a campaign to distribute malicious content. The document body is heavily obfuscated and unreadable, providing no direct clues to its intent beyond the presence of embedded URLs.

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 http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a6e9501e420---94058238616.pdf In PDF document text
    • http://mictrogiang.com/userfiles/files/lofonuwozop.pdfIn PDF document text
    • https://spheresignal.com/app/webroot/userfiles/files/davize.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16098792bdee8b---48533443621.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/47d1c0f9431240cc676935828ddb6c49/jumukewipimituxoka.pdfIn PDF document text
    • https://storycycle.com/ckfinder/userfiles/files/taxifamebomenep.pdfIn PDF document text
    • http://www.mostex.sk/files/articles/file/vamena.pdfIn PDF document text
    • http://luluscafeonline.com/uploads/files/10402425104.pdfIn PDF document text
    • https://dovolena-jiznicechy.cz/uploads/29485114603.pdfIn PDF document text
    • https://whiteelephant.co.in/wp-content/plugins/super-forms/uploads/php/files/d04f0fed2fe841298e2935c7341bf7ce/35818120051.pdfIn PDF document text
    • http://banphimchuot.com/userfiles/file/xafamenajipif.pdfIn PDF document text
    • http://ambulatorioveterinariopisillibertozzi.eu/userfiles/files/9880553058.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/024347ee0a228a52f7b3d884c52883b5/60105555870.pdfIn PDF document text
    • https://www.sesc-am.com.br/Selecao/ckfinder/files/xifumomufivotifi.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/0fe2924a8ff6858e38cb564bfaee502a/zanenuvul.pdfIn PDF document text
    • http://sun-tes.ru/files/file/bumamivigivanem.pdfIn PDF document text
    • https://dla-pracownika.pl/pliki_user/File/dafiju.pdfIn PDF document text
    • http://kapsalonvogue.nl/files/file/gijerogasutaxavolud.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/28912617972.pdfIn PDF document text
    • https://hainutedecopii.eu/ckfinder/userfiles/files/buwutexigezirofibenifila.pdfIn PDF document text
    • http://vietkinggroup.com/uploads/userfiles/file/mopuxuzif.pdfIn PDF document text
    • https://hijaulumut.com/contents//files/bolekadoxuxeketitita.pdfIn PDF document text
    • https://balbok.net/admin/ckfinder/userfiles/files/wodudonedojamejikoniki.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078e9e90bdce---rasirele.pdfIn PDF document text
    • http://karimeh.com/public/userfiles/file/52224845817.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=the+glass+menagerie+script+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_off0000df5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF5C 17268 bytes
SHA-256: 2d698b7e9708f03b23bec1b3b16ee2bd3d275bca80844f3c773c4c021aeb5b9d
font_01_sfnt_off00010bef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BEF 10912 bytes
SHA-256: 8a2d57b905452e4074d7d59e5b2a5253a12bf6e4ec3cf5c975be98214078b63b
font_02_sfnt_off000124c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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