Malicious PDF — malware analysis report

Static analysis result for SHA-256 c33d5c1cbd1ab3b9…

MALICIOUS

PDF

175.3 KB Created: 2021-07-02 18:32:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: ffc0adaecace7f2254ff3bc0e2105308 SHA-1: 03b97e6eb90ba97ce0785be19a901e4343d2c746 SHA-256: c33d5c1cbd1ab3b9118d7d62e876574f3892a3798b3e0f510d1368e43f78fcce
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. Multiple heuristics indicate the presence of external URIs and links pointing to compromised WordPress upload directories. The document body is heavily obfuscated, preventing analysis of its direct content, but the associated URLs suggest a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9904

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 https://wastran.ru/uplcv?utm_term=philip+kotler+marketing+management+questions+and+answers PDF link annotation
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/e14ce13ae942fd20bc89de662d0e0387/pesadifusi.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2ffac68313---petigonoxuzuzebesepip.pdfIn PDF document text
    • http://iltorg.ru/upload/file/bepitazunudatiluva.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/4pls66u48vlcsa85vg25ed1dl5/jigazatoridupup.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/90832692757.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160803657a8a5c---fipiwezefoxif.pdfIn PDF document text
    • http://brmhn.com/userfiles/file/20210618100312_ef8r6e.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/nkaego3svcve7r4p140s9hcrg5/rigesudadam.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9af55ac52e---39203091538.pdfIn PDF document text
    • http://fantalife.nl/userfiles/file/57208103857.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/fe16576935393c2e54b428761e70d568/19564530231.pdfIn PDF document text
    • http://jar-ted.pl/file/23863665361.pdfIn PDF document text
    • http://asustainable.com/global/file/wuroruzisenejeb.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b3559ae8ce8---61205246500.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/polinewutukalapum.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/50198456155.pdfIn PDF document text
    • http://slsnn.ru/content/files/87327754018.pdfIn PDF document text
    • https://samyenngochoang.com/wp-content/plugins/super-forms/uploads/php/files/8hj758fafo4o4tinop5dpiif97/pubumejivedomufuridobof.pdfIn PDF document text
    • https://vietnaminsight.biz/ckfinder/userfiles/files/bodokutom.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.net/ckfinder/userfiles/files/35141453967.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608064d700c95---25025897912.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607abe9ca33d4---ketarigizumeretujop.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/m7mv3aj7l3sr6kn13jks5h5n7p/revanewiwumoradod.pdfIn PDF document text
    • https://gastrotest.co/ckfinder/userfiles/files/lorat.pdfIn PDF document text
    • 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_off00024dd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24DD4 11264 bytes
SHA-256: fcdbb45b07bd248884e7db6affe42ed66b344f55e9df02be97de153741ce5299
font_01_sfnt_off0002679a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2679A 17992 bytes
SHA-256: 43d7b34e45ad9ca171a3bd311ecac3111afea1797fcd7b32e9059e2c0c2e3a0a
font_02_sfnt_off000296ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x296EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1