Malicious PDF — malware analysis report

Static analysis result for SHA-256 b34bf6d4c1358ddf…

MALICIOUS

PDF

82.3 KB Created: 2021-09-02 10:05:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 49c9189d5f7ddb12565ad92f55724f48 SHA-1: 357d75fccca3f0349000b7d924110c28edb65804 SHA-256: b34bf6d4c1358ddf8731bf47ea5e8740a40738d462140b5d8a060c96977baa68
156 Risk Score

Malware Insights

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

This PDF was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs that point to other PDFs hosted on compromised websites, likely to distribute further malware or phishing content. The presence of multiple links on disposable hosting and compromised CMS uploads suggests a coordinated effort to lure victims.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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 https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/fb832hrvb4plc5tgum7spmdld3/pufabakelusufavisubunawi.pdf In PDF document text
    • http://inciboya.com/resimler/site/files/lasasorinuvirar.pdfIn PDF document text
    • http://taxiluzern.ch/khurasan/userfiles/files/kiruvabamijezulelaxad.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1610e310e11fbd---selekizejomikotovof.pdfIn PDF document text
    • http://businesslegalgroup.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kaguwimej.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/55930439561.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/741e96523770b5ac44c1010201362495/8616128408.pdfIn PDF document text
    • https://bank-kredit.at/ckfinder/userfiles/files/26288063618.pdfIn PDF document text
    • https://99shayari.in/userfiles/files/lataxega.pdfIn PDF document text
    • http://emanuelmlevin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/4987322333.pdfIn PDF document text
    • http://maketmaster.ru/admin/ckfinder/userfiles/files/88824071469.pdfIn PDF document text
    • http://kadernictvo-svetlana.sk/editor_uploads/system/files/gisaripujufivebizowox.pdfIn PDF document text
    • http://privateeducation.sg/verzsape/demo/upload/admin/files/98271340374.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/4qh9cvu5ns0d8eo4j6mqeg0vcb/8952856394.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/gatiriwoxipowogabaji.pdfIn PDF document text
    • https://wecareu.net/ckfinder/userfiles/files/21168620249.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/xaxetigu.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/siwurukurugarilolujet.pdfIn PDF document text
    • http://vitanova-cattery.com/upload/file/rajaxekoxotukibu.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/8fa444916b02edf3e0be6760c8cd1810/xujep.pdfIn PDF document text
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/827a3e3e7d732ee58f8a832a06cd9910/dafilimegajaxaxererad.pdfIn PDF document text
    • http://banghaija.com/userfiles/file/feranosoborowozuxe.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160de05af720a7---85802781146.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=yrc+freight+tracking+numberPDF 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_off0000db1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB1E 10764 bytes
SHA-256: 57012011a90c9747e1d671bf8405ffe374edb111d9651c50b0bc17a0cc57fc78
font_01_sfnt_off0000f3ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010bbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BBF 18356 bytes
SHA-256: 0092daad5981f4998dc94e045383f962e706d3cfdbfdd6d0ad5286773d5da36d

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