Malicious PDF — malware analysis report

Static analysis result for SHA-256 06677738130d68bf…

MALICIOUS

PDF

74.3 KB Created: 2021-09-18 09:27:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 381fa9160fb352dc35fc696138ab490f SHA-1: 66d93c108cb8cbcf95915521a7a8b2662835b415 SHA-256: 06677738130d68bfee25c3f73b710d242ced6f29a86f2b641afc22b87a696e55
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, forming a link farm. The embedded JavaScript likely facilitates the download or redirection to malicious content, contributing to the phishing and trojan delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • 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.
  • 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 https://krisoc.ru/uplcv?utm_term=droid4x+emulator+download+for+windows+10+64+bit PDF link annotation
    • https://kmkmekanik.com/upload/ckfinder/files/rivarita.pdfIn PDF document text
    • http://e-hematologica.pl/users/file/namuzeduperamubimak.pdfIn PDF document text
    • https://sonerofset.com/userfiles/file/zawiminijojimis.pdfIn PDF document text
    • https://cfi-registration.amyhalter.com/buzzboxgift/img/userfiles/files/tudil.pdfIn PDF document text
    • http://barrospizzadb.com/uploads/files/96684216604.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16135430bb27c0---mudirereju.pdfIn PDF document text
    • http://parfumerieindex.nl/images/uploads/73093786672.pdfIn PDF document text
    • https://gberwanda.com/gbe/useruploads/blogs/files/51174110787.pdfIn PDF document text
    • http://gesundezellen.com/neu/userfiles/file/jiwotulabuduwe.pdfIn PDF document text
    • https://www.rougeindigo.com/ckfinder/userfiles/files/gagonesumekej.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/16142a020a8ca2---8599953727.pdfIn PDF document text
    • http://romento.com/uploaded_files/userfiles/files/29736785097.pdfIn PDF document text
    • https://childprotectionindia.com/lexcyberia/userfiles/files/98903809331.pdfIn PDF document text
    • https://loctra.net/userfiles/file/jatogudafuneluzogaro.pdfIn PDF document text
    • https://securitydm.eu/slicice/file/76118880295.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1614559bb6c752---5762217321.pdfIn PDF document text
    • http://perechen-jurnalov.ru/js/ckfinder/userfiles/files/24151402854.pdfIn PDF document text
    • https://coil.hk/upload/files/41338041898.pdfIn PDF document text
    • http://naturalfurnish.com/userfiles/file/16589508122.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613174cbc44ff---32326130720.pdfIn PDF document text
    • https://petribax.nl/userfiles/file/100573015.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613c3bbe1d400---28565899548.pdfIn PDF document text
    • http://bridgeonlaw.com/filespath/files/20210916063540.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_off0000bd1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD1E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d530.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD530 16768 bytes
SHA-256: 766acd238249e9e793ec5c47c77e41a659ad2a4c3ed45383b14af00c90d619ee
font_02_sfnt_off00010036.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10036 11364 bytes
SHA-256: 8e01627f5a2586f47e763b323f22fe52586a27b6f3e584eebef6a166a3195367

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