Malicious PDF — malware analysis report

Static analysis result for SHA-256 59bb5c8a726979a5…

MALICIOUS

PDF

98.5 KB Created: 2021-08-08 03:50:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8dac0081395f51f269936f919dd364e3 SHA-1: 2fff0c9a85c2a1891f1f5bb6243e8f879929980f SHA-256: 59bb5c8a726979a51e97109ba0ec7397e22a076f838e2023979d23d3d3ec6067
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to compromised websites, suggesting a phishing or malware distribution campaign. The PDF structure and link farm heuristics point towards an attempt to redirect users to malicious content hosted on these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://propellerclubsandiego.org/uploads/files/99960222781.pdf In PDF document text
    • https://betenenergy.com/sites/default/files/file/fewoleligofukumomot.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b487467ad6f---91999105988.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/68318346042.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/ce965fb8ba0181e1da7f48d743de5f77/1746370667.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a96a3615bf2---piwojavolotisopixuvurizo.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/xutawarotavafu.pdfIn PDF document text
    • https://monamifrance.com/FileData/ckfinder/files/20210618_4DD1E8618009FC9D.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ca305914d02---46396686983.pdfIn PDF document text
    • http://vetsnab32.ru/userfiles/file/vikejigejijetamav.pdfIn PDF document text
    • http://superfishinglewood.com/uploads/files/leluziluxivavi.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160950f5063e69---53981640289.pdfIn PDF document text
    • http://synthecinter.com/userfiles/files/85099968403.pdfIn PDF document text
    • http://bularz-auto.pl/images/userfiles/file/26500363639.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16073e9748fc9b---66872917784.pdfIn PDF document text
    • https://mmoxx.mn/userfiles/files/98257240965.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a3e4699c9f2---58288512711.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4671c012c---feduwajefopebikalove.pdfIn PDF document text
    • https://latework.cz/soubory/padajedarure.pdfIn PDF document text
    • https://mgogs.com/mgfiles/file/67529337594.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a8a70c7e0d---nopunakagolelalabeleb.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/59781974077.pdfIn PDF document text
    • http://anipetkingdom.com/webroot/img/files/jagusevoliguxox.pdfIn PDF document text
    • https://fullhousetourism.com/UploadFiles/file/20210630020516111.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fe2794bfda9---88156917355.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=google+slides+themes+free+technologyPDF 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_off00011cd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CD2 16860 bytes
SHA-256: 7e45f3fcf9d933cdf6da82c3580412ac8892801a300f4d5b2a14e950bd79780d
font_01_sfnt_off000148c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000160dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x160DD 10916 bytes
SHA-256: 3ad853d1402df3352bbaf23875ed9cafc901866978a3b53fd28243cea95ffc2c

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