Malicious PDF — malware analysis report

Static analysis result for SHA-256 317c9ee4ef10d2b9…

MALICIOUS

PDF

83.2 KB Created: 2021-09-20 21:51:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: afafd31d94f6c312a4f69aab591f9e15 SHA-1: 1790b32c4cd2fd22655e7d6080aa15a9e04dcb56 SHA-256: 317c9ee4ef10d2b9f6993ada7ef78d22c3698223c67d5d9ddcf5d5b59e5a8e70
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs and link farms pointing to compromised or disposable hosting, suggesting it's used to redirect users to phishing sites or download further malware. The presence of multiple PDF-specific heuristics related to URI links and compromised CMS uploads reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://pistant.ru/uplcv?utm_term=ultimate+custom+night+apk PDF link annotation
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/39a7b5171bf02780120570414bf5cc2b/kixupob.pdfIn PDF document text
    • http://saaretravel.ee/images/file/mavapagefapoxurenufeguf.pdfIn PDF document text
    • https://theatresaucinema.fr/uploads/file/nitobofelides.pdfIn PDF document text
    • https://drlalashow.com/php/billboard/uploads/file/38499566143.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/3fb71d40c6cc584d40efc1a16f9f71cf/15271083711.pdfIn PDF document text
    • https://cvsc.co/userfiles/file/55847862505.pdfIn PDF document text
    • http://theexplorerthai.com/userfiles/files/sotatumenasaxubi.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136fcb57905f---21952461969.pdfIn PDF document text
    • http://santamariamikado.com/uploads/files/25691475528.pdfIn PDF document text
    • http://sun-green.be/ckfinder/userfiles/files/jevisi.pdfIn PDF document text
    • http://devitohomesorlando.com/userfiles/files/kuluxufaxu.pdfIn PDF document text
    • https://cfi-registration.org/buzzboxgift/img/userfiles/files/47230935122.pdfIn PDF document text
    • http://wish-pharma.com/upload/files/serilu.pdfIn PDF document text
    • http://connect-event.fr/ckfinder/userfiles/files/retotakawibezuk.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/aa8ec94edea252b24ff4b74363cf4314/kawimoxasivigefak.pdfIn PDF document text
    • http://aguito.madteam.net/ckfinder/userfiles/files/zalefitolawulo.pdfIn PDF document text
    • https://biocoils.com/img/file/waxepixekoviduvododepux.pdfIn PDF document text
    • http://istihdamhaberleri.com/upload/ckfinder/files/27921140486.pdfIn PDF document text
    • http://elpijisystem.com/file/luxiniwot.pdfIn PDF document text
    • http://flyingkirin.com/uploadfiles/file/020248151046.pdfIn PDF document text
    • http://www.keizerco.nl/userFiles/file/44107881287.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_off0000db12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB12 19548 bytes
SHA-256: dcfc6836fbf7d5e31a4c2e94cacadf148c3f7e9d748dc9660452969e90250d68
font_01_sfnt_off00010eaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EAA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000126c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126C1 10920 bytes
SHA-256: d79718b691fddb5d24bc16a51ccb848ab0b6d106a2b56f8cccffbbd649156c62