Malicious PDF — malware analysis report

Static analysis result for SHA-256 0dc9021f94bc4b6a…

MALICIOUS

PDF

93.0 KB Created: 2021-08-19 20:12:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 1a3ca3e70fd145c8e52893fb176d244a SHA-1: 3600a177c091489dc110d3dad42c849ce3dada58 SHA-256: 0dc9021f94bc4b6a419f77b8f8e093ec70e99bf92bbccfcb68f203675d8216e7
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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 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://paoladebenedetti.eu/userfiles/files/58136201546.pdf In PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/8043334470.pdfIn PDF document text
    • http://northphoenixmustangs66.com/clients/4/4b/4b49b54eec06ebba3741256e9f3e6f2b/File/kojibobojuwiziki.pdfIn PDF document text
    • https://transpack-krumbach.de/_upload_bilder/_filemanager/file/lekofekave.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/c194a6ddc3ef38f2a2b5ff7c2204edac/kusuzoxerirel.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/60072cc682d383d4f12b752cbd68aec8/jalola.pdfIn PDF document text
    • https://wroclawmodelshow.pl/ckfinder/userfiles/files/83475859481.pdfIn PDF document text
    • http://siltherm.com/ckfinder/userfiles/files/4060271051.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/96574496270.pdfIn PDF document text
    • http://verzorgingsindex.nl/images/uploads/pefavazuwagodo.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/8ac02717009b75beba734c3f0eb83912/vunabowerepuxep.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/08dd6fa2f1cdcf98d28c9750da3ccdaf/66555626744.pdfIn PDF document text
    • http://cloverpark1961.com/clients/6/6a/6a73a08bb68f643008adb5efbbb44e43/File/poponepulifijubiruvada.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/d8a1cfb95012e193cd60480e7ea1b342/102174735.pdfIn PDF document text
    • http://www.drivingschool-brno.cz/files/files/71023262680.pdfIn PDF document text
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/af498774b15898f5c438230e54cb6d54/66545197006.pdfIn PDF document text
    • http://medicapoland.pl/uploaded/file/zusixekoxuxibegeju.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/16075e3027afec---bilifalotaxilinedexof.pdfIn PDF document text
    • https://bor-diing.com/upload/files/vekawoxedijoroguturusoxi.pdfIn PDF document text
    • http://ntep2008.com/UserFiles/File/5027938924.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/667bea6b479f2e90059173d563c33a72/68077830831.pdfIn PDF document text
    • https://quatcongnghieput.com/uploads/files/zumezanijadejup.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210508170604_2095346615.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609435ce3f2fb---25245895231.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=positive+words+that+start+with+k+in+frenchPDF 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_off000106e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106E1 18240 bytes
SHA-256: 6575bc806039dbdfb3bfd02a38eb3066c759fe8b17ee5d8e974bde01e29ce259
font_01_sfnt_off0001347d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1347D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014c94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C94 10772 bytes
SHA-256: ed17c7b331c22497b3815c26ab52076e74a2c25da8947588fa8a13d706b1d0f5