Malicious PDF — malware analysis report

Static analysis result for SHA-256 22c9281986081336…

MALICIOUS

PDF

72.5 KB Created: 2021-09-08 10:34:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: be8d9b39aea47c1a331a04b43fac88ba SHA-1: 7c1cf59df2e8a1806db72687288ac7d474cf5ea7 SHA-256: 22c92819860813363ce911a906bae066ebf169ec38d708b5dd7ee72e34a2f154
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. While no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • 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 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://alituncer.com/userfiles/file/wipev.pdf In PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160dba7dbbd943---7607670898.pdfIn PDF document text
    • http://banghaija.com/userfiles/file/jigumatuzejusedisinijipoj.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/1aad70372aba59b4d050647be137ed84/47469609583.pdfIn PDF document text
    • http://dblbtech.com/userfiles/file/29792097719.pdfIn PDF document text
    • http://jump360.co/upload/files/20210807005805.pdfIn PDF document text
    • http://murphysbeads.com/clients/54316/File/rabadojikopomodege.pdfIn PDF document text
    • https://kapefashion.com/files/files/wowog.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607db601273e2---97486466962.pdfIn PDF document text
    • http://burfel.ru/upfiles/files/10257183352.pdfIn PDF document text
    • https://ppuhperspektywa.pl/files/edytor/file/59547633510.pdfIn PDF document text
    • https://www.cdsale.org.au/application/third_party/ckfinder/userfiles/files/13641415028.pdfIn PDF document text
    • http://ibb-online.ru/f/file/febora.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/d18c0mf5dngfqvpdqdcbh133i6/wekezasanaserewekimivok.pdfIn PDF document text
    • http://esistore.de/userfiles/file/todavonerut.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/161259b918653e---61970689992.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/zegijo.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/87607998068.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9e31c6a90---kuxubenawesitanomuxux.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/a35832c3a1ae52286b60c6846ab3e06e/meguvamuxuxuduvuturumi.pdfIn PDF document text
    • http://hcviet.com/img-phuctri/files/62204153196.pdfIn PDF document text
    • http://mellorymotors.ru/admin/ckfinder/userfiles/files/xodilofumufedakifexutekap.pdfIn PDF document text
    • http://teacherandtraining.com/coj_u/KK/userfiles/files/niwemedaguvipavuterexano.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160adecbea084a---xinivuxekuwelaxewufokagov.pdfIn PDF document text
    • https://www.makathastaliklari.net/wp-content/plugins/formcraft/file-upload/server/content/files/16074090909182---11743088423.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=the+sage+handbook+of+social+psychology+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_off0000b8f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8F9 16276 bytes
SHA-256: 1337a06be53c3d8de49441118dbeed51f205be4f50887092ccaf829fbf2c90c7
font_01_sfnt_off0000e303.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE303 11008 bytes
SHA-256: 3e44aca96d0aad9899ceea554e1f7f36c06040eb89e5da6168d5888eed592227
font_02_sfnt_off0000fc20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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