Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3ade91cc871f4be…

MALICIOUS

PDF

69.7 KB Created: 2021-09-30 22:55:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: de763e1e38ce0aad1d6daef94e08676f SHA-1: e021ee7a3c57dcb896ee774dd0b796351dea251a SHA-256: c3ade91cc871f4be384c52cb1133253e42155f12573992ea51cb6efd8207e4e0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external resources, many of which are hosted on compromised websites or disposable domains, suggesting a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://chothuethietbi.info/img/files/bimaxujatokareramigo.pdf In PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16140369c707c3---paxutodidoki.pdfIn PDF document text
    • https://seas2010.cienciaevida.pt/site/upload/file/vojupemorogepudesutir.pdfIn PDF document text
    • http://www.benyowsky.com/resources/files/laxeroxijopinu.pdfIn PDF document text
    • http://etnorom.hu/pictures/xawemoji.pdfIn PDF document text
    • http://bischofs-scheune.de/userfiles/file/80431461285.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/3f6b366aca257420e3a3b283406fe693/75688819789.pdfIn PDF document text
    • http://naturallabs.de/userfiles/file/fuzedemopo.pdfIn PDF document text
    • http://skisun.it/userfiles/files/vasixitosovet.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143a3d28de86---47556539585.pdfIn PDF document text
    • http://phrabat.net/UserFiles/File/xopobeja.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1614c40cc884a0---juwefavor.pdfIn PDF document text
    • http://tcyy88.com/userfiles/file/2021091723534573499.pdfIn PDF document text
    • http://www.deep2001.com/images/library/File/gadesediga.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/15835298259.pdfIn PDF document text
    • http://asliev.coco1490.com/upload/file_folder/file/tunovosimiviwodamiburizun.pdfIn PDF document text
    • http://teamhead.net/userfiles/file/55269215453.pdfIn PDF document text
    • http://ajitcoatings.com/uploads/bonino.pdfIn PDF document text
    • https://praktijk-fix.nl/userfiles/image/file/9524180097.pdfIn PDF document text
    • http://rambud.pl/uploaded/file/29581046710.pdfIn PDF document text
    • https://medtek.vn/storage/file/44417633486.pdfIn PDF document text
    • https://rabudiagnostic.com/userfiles/files/55173170413.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/cf8cbaaacfe06a9aff48772ade55119c/gisalalijixofaf.pdfIn PDF document text
    • https://www.adoz.cz/ckfinder/userfiles/files/59238086179.pdfIn PDF document text
    • http://eksternest.be/images/file/doxab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=vatsyayana+book+in+bengali+pdf+free+downloadPDF 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_off0000b208.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB208 11076 bytes
SHA-256: bf5f65f2c2d5ee6dedb6d3f7d9b123ba041569d4031767fe7f46cf213bb430e4
font_01_sfnt_off0000cba7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBA7 14724 bytes
SHA-256: 81a560c488158f969c7e70cf668e233ac22f799995e41557d9abe66054f691a4
font_02_sfnt_off0000f08d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF08D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1