Malicious PDF — malware analysis report

Static analysis result for SHA-256 c42ed04982fb34a4…

MALICIOUS

PDF

83.1 KB Created: 2021-09-13 12:59:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 11a21edc7c5fe795353c461a546936f7 SHA-1: 146e0c73dd0296b85623a32dafee09852a00d193 SHA-256: c42ed04982fb34a4188079fbefb10bba225bf74da9faf2a2a8e0792734409e3e
196 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm and a browser extension installation lure. Multiple external URLs were extracted, suggesting the document's purpose is to redirect users to malicious sites, likely to download further payloads or steal credentials. No scripts were extracted, but the overall structure and heuristics point to a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://wastran.ru/uplcv?utm_term=chrome+address+bar+bottom+android PDF link annotation
    • http://esistore.de/userfiles/file/visidamowapenujurobesolix.pdfIn PDF document text
    • http://pc580.cn/upload_fck/file/2021-9-6/20210906131953252708.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/1e0edbd24d3f14a90eb6e8da33fb44b7/20025272981.pdfIn PDF document text
    • https://lotte-ppta.com/beta/assets/file/xudadeluxoremomapi.pdfIn PDF document text
    • http://ebd.su/UFD/7623/files/11338497197.pdfIn PDF document text
    • http://methese.com/upload/files/84655152952.pdfIn PDF document text
    • http://www.icf-plant.com/files/file/reluxido.pdfIn PDF document text
    • https://xn--80aesyq.xn--p1ai/files/file/8600758243.pdfIn PDF document text
    • http://nousgarage.com/userfiles/file/4862770726.pdfIn PDF document text
    • http://zimmerei-possert.at/16959127491.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/jovenopuludoxuroraropoz.pdfIn PDF document text
    • http://hak-al.com/resimler/files/pavulerovodumugifibezom.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///202191214799518.pdfIn PDF document text
    • https://www.utn.ac.cr/sites/default/files/files/bokowelojitebonegegifumam.pdfIn PDF document text
    • http://yigang-lin.com/uploads/files/202109110608277398.pdfIn PDF document text
    • https://generalaudit.pl/eurostyl/photos/file/21688398836.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16139bcc9b4196---20726962826.pdfIn PDF document text
    • http://kemnhapkhau.com/upload/files/1240152021.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/16133177bc7f03---59612703060.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613c28843e098---68254503576.pdfIn PDF document text
    • http://canadianrockies.info/files/file/xamosevomugol.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/80f62736b8a256ec354896cb47b9168e/90593967452.pdfIn PDF document text
    • https://sharks-cz.cz/images/file/dokabugitep.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_off0000df91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF91 10636 bytes
SHA-256: 65610ae2352b1ab773f191d87c6e71984eef52317e9624a92b77d270c3f6b430
font_01_sfnt_off0000f7ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7BA 18436 bytes
SHA-256: 05979b6a0467d0a13eba7d3af689f4e56e2dfb8cbb87c6837d29dd737a0d0853
font_02_sfnt_off00012711.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12711 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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