Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ec3e07abe45f8bd…

MALICIOUS

PDF

74.9 KB Created: 2021-08-29 08:18:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 77477782b2e9a94f092804dd44b73859 SHA-1: 4103ac01fdb7f3c368292fff76c7893cb52b72d6 SHA-256: 9ec3e07abe45f8bd084b2d9f33e105c65073d5cf677335cda41e1821153114fb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous links, many pointing to compromised WordPress uploads or disposable hosting, suggesting a link farm designed to redirect users. The PDF itself is heavily obfuscated and lacks readable document body text, but the presence of external URI heuristics and compromised CMS upload links strongly suggests a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://dga.gr/ILC/img/file/84551627508.pdf In PDF document text
    • http://xn--49s538bo8ux8c.net/userfiles/file/nulozomaxa.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/riganexugigenak.pdfIn PDF document text
    • http://bakersfield.thepokeluau.com/uploads/files/rasojanorulofemon.pdfIn PDF document text
    • https://paron-rebondir.com/uploads/files/kirejonitegopotavefet.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160705a3cb0bb8---jemikaxitifadipesi.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/4ef391d3658276b1324999aeff942b84/693125218.pdfIn PDF document text
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/52278662662.pdfIn PDF document text
    • http://www.uc-kushiro.net/images/library//File/kuwixela.pdfIn PDF document text
    • https://mszukam.pl/dat//file/livegumawofolusedox.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/eajmchso711tcdevmi9gpbn5o1/gujomamufupalepoja.pdfIn PDF document text
    • https://peterdegendt.be/file/nakugonusamibudulu.pdfIn PDF document text
    • http://gandolfiarchitetti.com/userfiles/files/87279233604.pdfIn PDF document text
    • http://cokhibaosang.com/media/ftp/file/64179729106.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/9307a3fc42f4ae39ea3585f7dd8b11b7/98543269226.pdfIn PDF document text
    • http://fygl.net/uploads/file/090152065182.pdfIn PDF document text
    • https://www.makathastaliklari.net/wp-content/plugins/formcraft/file-upload/server/content/files/160762d1f03264---gadutuvuxubusipedejajane.pdfIn PDF document text
    • http://pechati-piter.ru/userfiles/file/67637685688.pdfIn PDF document text
    • http://topimmigrationlawyer.org/ckfinder/userfiles/files/83986727370.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/vabixopaperanogogajimilud.pdfIn PDF document text
    • http://xn--80akazwaeiw.xn--p1ai/editorfiles/file/kisapowomuk.pdfIn PDF document text
    • http://kurskodkb.ru/page_edit/_samples/userfiles/files/21987913979.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=slither+io+codes+2020+invisiblePDF 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_off0000c1a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1A0 10828 bytes
SHA-256: ba2ee27622da9e93bc88f6a666e7d9b30b84c6522da083ec0949df324cf40a34
font_01_sfnt_off0000da85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA85 17172 bytes
SHA-256: acc1fec9dca2f348be1ea9763a6277c0b9c7a04fa3506553bc1ade34ae6c918a
font_02_sfnt_off00010693.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10693 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1