Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ed242bb38b484d8…

MALICIOUS

PDF

77.4 KB Created: 2021-09-08 03:49:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ebd072d9208a277698b48e7fc32cd1e2 SHA-1: 487550958dd36a194862fd6c9f08073c0455995c SHA-256: 2ed242bb38b484d87c25fdbb5eb117709a24cc0afabefb70a3141ea0ef16809b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. These links are likely intended to lead victims to phishing sites or download further malicious content.

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://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/o0qur430nnv6ucubnvbvnmutt2/27636435744.pdf In PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac16337f24b---88209427359.pdfIn PDF document text
    • http://barsugo.com/ckfinder/userfiles/files/76213626718.pdfIn PDF document text
    • http://asijskepotraviny.cz/files/file/betelusexumo.pdfIn PDF document text
    • https://bloomland.com/sites/bloomland.com/files/97416043682.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078b9598a299---nuzuzuvujor.pdfIn PDF document text
    • https://vayamcs.com/content_files/files/16893977650.pdfIn PDF document text
    • http://cbestdesign.com/ckfinder/images_store/files/78280562504.pdfIn PDF document text
    • http://printific.com/images/contentimages/files/90758097391.pdfIn PDF document text
    • http://www.apsetedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160789fca89db3---wefexusozebasuded.pdfIn PDF document text
    • https://drsubhashawale.com/ckfinder/userfiles/files/sinedobemegemamujuzojum.pdfIn PDF document text
    • http://gramercygrand.ru/files/file/lotivifipolovoxugumizufev.pdfIn PDF document text
    • http://fueandhair.com/userfiles/files/marateluxifad.pdfIn PDF document text
    • https://samoinstitute.mn/uploads/assets/file/14109612312.pdfIn PDF document text
    • http://extracam.es/app/webroot/arxius/file/buvapano.pdfIn PDF document text
    • https://whiteplacard.com/UserFiles/file/wujujilazaduva.pdfIn PDF document text
    • http://dachastyle.com/userfiles/file/72998596185.pdfIn PDF document text
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/48d6834c7b7bf025b2a97af485140f21/dozijejixon.pdfIn PDF document text
    • http://voorwindenotariaat.nl/app/webroot/files/ckeditor_files/files/fijibejekuz.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/hp6apa83jib2pi9h5l918tda84/monijow.pdfIn PDF document text
    • http://iphysiology.ru/upload/13908329907.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=competitive+programming+book+3+pdfPDF 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_off0000cb23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB23 16940 bytes
SHA-256: 30c409930ceb3b349f9ca3007acfad920d17ca08f0ef631d781e39e039d0d77e
font_01_sfnt_off0000f6df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6DF 11128 bytes
SHA-256: d00066278a5d9f655e93cc1f62e266fc4acd5c5c8619755bdbdf2d68398622da
font_02_sfnt_off00011078.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11078 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1