Malicious PDF — malware analysis report

Static analysis result for SHA-256 acbd020d36eab986…

MALICIOUS

PDF

95.1 KB Created: 2021-09-16 06:56:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0fec9465dd97643aeff6c55c59f891e1 SHA-1: b9ef4c3d435d6d45aff5a14f52f5e96178498a38 SHA-256: acbd020d36eab986e44c100dda8d685a31792653c06226087287dacbe1ce00df
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URLs, many of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these external URLs, which are characteristic of phishing lures or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://pistant.ru/uplcv?utm_term=game+of+thrones+watch+online+free+123movies PDF link annotation
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16138c07c927ed---telikugofupo.pdfIn PDF document text
    • https://christianklein.eu/Quansis/ckfinder/userfiles/files/lukusiwuvexuko.pdfIn PDF document text
    • http://wxmx.cn/upload/ckimg/files/202109072315173802.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/65556797841.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/1a0495ccbaedaf542a25c7b48d3b4671/ruxinenupe.pdfIn PDF document text
    • http://vasekurzy.cz/userfiles/file/25524493208.pdfIn PDF document text
    • http://shop-exclusive.cz/userfiles/file/sisul.pdfIn PDF document text
    • https://cheesykeju.com/contents/files/31909491079.pdfIn PDF document text
    • http://gemwishrs.com/ckfinder/stones/files/bipemijan.pdfIn PDF document text
    • https://apatity.verlauf-ekb.ru/admin/ckfinder/userfiles/files/fizuxototanokodek.pdfIn PDF document text
    • https://malashealthcare.com/userfiles/files/31806629209.pdfIn PDF document text
    • http://antansconstructions.com/ckfinder/userfiles/files/xabaxuketakeg.pdfIn PDF document text
    • https://betsin.org/userfiles/files/55192334463.pdfIn PDF document text
    • http://www.hausman.eu/images/wyswig_images/file/98175719008.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dd882da449---51428098686.pdfIn PDF document text
    • https://swagath.co/new/ckfinder/userfiles/files/mebubumek.pdfIn PDF document text
    • http://tivatijapan.com/uploads/userfiles/file/moxijumiruzimipilopeboxag.pdfIn PDF document text
    • http://www.salac.cz/ckfinder/userfiles/files/tuxodegepe.pdfIn PDF document text
    • http://shepardinteriordesign.com/rw/upload/file/90330605476.pdfIn PDF document text
    • http://p-itos.net/admin/userfile/image/file/49640052665.pdfIn PDF document text
    • http://www.mariabeckmann.com/fotos/uploads/files/wutakotekikeseb.pdfIn PDF document text
    • http://hsaltsj.com/uploads/files/nedikobuzuwevowila.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_off00010a40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A40 11136 bytes
SHA-256: 7717d35dfb856f1d803e967834a036463734842458903fffa7ffc1ee6576d403
font_01_sfnt_off00012439.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12439 19456 bytes
SHA-256: e88d79ae61d81c0134709493674a91778a746f550c1de068bb2c9102c37241c9
font_02_sfnt_off00015692.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15692 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1