Malicious PDF — malware analysis report

Static analysis result for SHA-256 89bdd1b6e49150e6…

MALICIOUS

PDF

70.3 KB Created: 2021-09-13 10:22:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e6c31b44733bb17877065d81aac6ee87 SHA-1: f8eb27accee7c1682c47bde459be8e10173e55a9 SHA-256: 89bdd1b6e49150e665c27f4a21244c0369848b325705e7f7e8fdf40fdb896b84
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious activity, likely serving as a lure to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://pixomot.ru/uplcv?utm_term=gta+vice+city+ios+free PDF link annotation
    • http://inbond-cn.com/userfiles/file/jusununuxamege.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc288888c2---supasunoje.pdfIn PDF document text
    • http://matras-devison.ru/upload/file/4889218398.pdfIn PDF document text
    • http://agrostroi-proekt.ru/ckfinder/userfiles/files/xogizupaxososofobekixo.pdfIn PDF document text
    • http://dtyxbpzx.com/filespath/files/20210908233155.pdfIn PDF document text
    • http://www.ez4parcel.net/upfile/files/2021/09/05/16629270529.pdfIn PDF document text
    • http://sunil.kr/uploadfile/fckeditor/file/48680756757.pdfIn PDF document text
    • http://microcement.ua/userfiles/file/61286028277.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/4a95548203bf60cbf38e0245c4c11dc0/gibevikekokofifewijovud.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-9-4/20210904210823487531.pdfIn PDF document text
    • https://gencshoworganizasyon.com/upload/ckfinder/files/zegofamexizafivowimilitez.pdfIn PDF document text
    • http://zbraneklapka.cz/ckfinder/userfiles/files/1371275916.pdfIn PDF document text
    • http://centroolosprato.it/userfiles/files/24198309523.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161391934e1648---puxipefomofukuziker.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a34d1090c1---bemezipixuluginuzetobowom.pdfIn PDF document text
    • http://poexali.org/static/image/_u/system/files/nolakiboreto.pdfIn PDF document text
    • https://postelezmasivu-olomouc.cz/ckfinder/userfiles/files/81043717928.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/ledunujot.pdfIn PDF document text
    • https://www.kuwaitpolyurethane.com/ckfinder/userfiles/files/penuvoxapovosoguwakazeziw.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_off0000b22d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB22D 10400 bytes
SHA-256: f9b5156ab3721e187ff8f786d7bb7b24965d8988ea9bb0890b763951009881da
font_01_sfnt_off0000c9f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e20b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE20B 16588 bytes
SHA-256: dd404794d657a02bcbdb5b5fe087f55b919bd42430faefb07c2848ddf7daf752