Malicious PDF — malware analysis report

Static analysis result for SHA-256 0799a55e6771838a…

MALICIOUS

PDF

70.5 KB Created: 2021-10-02 21:30:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: e8b2a5e5ffd0754ebba3eb5f78b5c727 SHA-1: 9d8fe2c9dc86d920f1216ff75098e7d23a17d237 SHA-256: 0799a55e6771838a206d22d424bfe31f8b6720de7366134dd9fc6105b93ceec0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a link farm pointing to compromised WordPress uploads and disposable hosting. The presence of embedded JavaScript suggests it may be used to facilitate the redirection or further payload delivery, a common tactic in phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://enjoyisagenix.com/ckfinder/userfiles/files/3259638063.pdf In PDF document text
    • https://sdhouse.info/ckfinder/userfiles/files/53592082440.pdfIn PDF document text
    • http://rebornfair.com/FileData/ckfinder/files/20210915_B108DB3F05BB26B2.pdfIn PDF document text
    • http://siltherm.com/ckfinder/userfiles/files/79067579216.pdfIn PDF document text
    • http://lovesenergy.com/file/44225918616.pdfIn PDF document text
    • http://101balkon.ru/upload/files/zododuvawirozot.pdfIn PDF document text
    • https://doctmcooper.com/userfiles/files/67587542888.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d31095dad4---kijawikikevivewokagevosi.pdfIn PDF document text
    • https://chachachat.info/js/ckfinder/userfiles/files/19428337248.pdfIn PDF document text
    • http://sochisushi.nl/survey/userfiles/files/52582363560.pdfIn PDF document text
    • http://asztalosweb.hu/userfiles/file/23328286689.pdfIn PDF document text
    • http://faurau.com/luodan/images/userfiles/file/satanelugelefomuvav.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/79524086376.pdfIn PDF document text
    • http://vasa-project.org/fckupload/file/74099150839.pdfIn PDF document text
    • http://plnjl.com/userfiles/files/24908750452.pdfIn PDF document text
    • http://matrixpaint.com/ckfinder/userfiles/files/23488391591.pdfIn PDF document text
    • http://arenabilardo.com/data/_files/75008998453.pdfIn PDF document text
    • http://xn--djr00fsyfv0o5qgy9u.net/filespath/files/20210925034657.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f210887350---22306972657.pdfIn PDF document text
    • https://sacc-la-chaux-de-fonds.ch/fichiers/file/16845333800.pdfIn PDF document text
    • http://almawred-sy.com/files/adminfiles/files/17488515056.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cc778a575d---17848662248.pdfIn PDF document text
    • http://amongelite.com/ci/userfiles/files/maxitapon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=law+of+octaves+definitionPDF 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_off0000b0e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0E1 17240 bytes
SHA-256: a0d140ab6e832da99f7fe223dfc7253a414584ee64e14bda3d83f6b69583afec
font_01_sfnt_off0000dcc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f4dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4DD 10432 bytes
SHA-256: 8d890ca135e835a725a4f9b1ac902dbb4916e5e57fc9d6867624fdbcb46ca247

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