Malicious PDF — malware analysis report

Static analysis result for SHA-256 88e06cb63a3e8aea…

MALICIOUS

PDF

97.4 KB Created: 2021-09-18 03:57:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 31a35808fb307112266d7de91f3a01d0 SHA-1: 6b517158d84a9d2b0314ae4bb109b51ac886a2d0 SHA-256: 88e06cb63a3e8aeaabddf3a2165d733784d6bc069ee7494fcb902e6159370c1f
204 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and is flagged by ML classifiers as malicious, with ClamAV detecting it as a phishing trojan. The presence of a fake CAPTCHA heuristic indicates a social engineering attempt to trick the user into interaction. The document also hosts numerous links, many on disposable or compromised domains, suggesting a phishing or spamming campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://elvirajogsi.hu/ckfinder/userfiles/files/levowipamefikipamejumeme.pdf In PDF document text
    • https://jaukiaplinka.lt/ckfinder/userfiles/files/60614727397.pdfIn PDF document text
    • http://plnjl.com/userfiles/files/46353655594.pdfIn PDF document text
    • http://bighost.vn/uploads/userfiles/file/92244054947.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/4vsmtc6gsa9fjsobbi73ier863/27707709153.pdfIn PDF document text
    • https://digireg.pl/upload/riwupowuwu.pdfIn PDF document text
    • https://cremyco.com/app/webroot/docs/file/kowamap.pdfIn PDF document text
    • https://drnanemilk.com/tctt/sites/aaa/file/69390396017.pdfIn PDF document text
    • https://clinicamanila.com/ckfinder/userfiles/files/dovijugajumelujexivu.pdfIn PDF document text
    • http://kayamedbursa.com/userfiles/file/24781419233.pdfIn PDF document text
    • https://serrechevalier-skifun.com/imagesfile/44342712537.pdfIn PDF document text
    • https://www.nickelmarket.co.za/includes/ckfinder/userfiles/files/konusuxixusapemawatat.pdfIn PDF document text
    • http://russia-ex.com/images/blog/file/8367550563.pdfIn PDF document text
    • https://kheops-so.fr/ckfinder/userfiles/files/92463113307.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/70504484910.pdfIn PDF document text
    • http://www.greenfield-sustainability.com/images/files/nexuxapuz.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139a5a65595e---75725460426.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/39tc8jsd09irapiri9meop4hqf/71781634872.pdfIn PDF document text
    • https://yourwebcenter.com/files/file/xilufe.pdfIn PDF document text
    • http://erfaspot.com/resimler/files/lojogeguxememaxopokufuwok.pdfIn PDF document text
    • http://kiiga.ru/userfiles/file/jozip.pdfIn PDF document text
    • http://bowlingkillers.com/imgdb/files/7405281309.pdfIn PDF document text
    • http://studiotecnicomancini.eu/userfiles/files/ragafepirofaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=fortnite+generator+v+bucks+ps4PDF 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_off00010dc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC6 21332 bytes
SHA-256: c23c4783f2e3aad4672009186156afbe8695fcb77d10a9b142d116e48c11a9b0
font_01_sfnt_off00014612.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14612 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015e29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E29 10956 bytes
SHA-256: d8ace8b2919a086d996aaeec0c8a10e8205dce485a2952481dc1d441620523c0

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