Malicious PDF — malware analysis report

Static analysis result for SHA-256 658a9112147503b1…

MALICIOUS

PDF

82.2 KB Created: 2021-09-13 07:25:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 6d70f5bd1b2293a9eb02391ec07a16c1 SHA-1: 2f46b6e754de8147607fa93f8e096a365c37ceea SHA-256: 658a9112147503b14b75554e4cf165ba929996b6f0b13b0d9159885f69160774
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farms pointing to various domains, many of which are hosted on disposable or compromised infrastructure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://irlanc.ru/uplcv?utm_term=how+to+install+kali+nethunter+in+android PDF link annotation
    • https://abicecream.ru/ckfinder/userfiles/files/sijumunujavanizofukigas.pdfIn PDF document text
    • http://le-bouquet.be/userfiles/files/ximiponanapux.pdfIn PDF document text
    • https://democv.associasuite.com/imagenes/contenidos/files/joxeko.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612f8aa9a6c66---91443091384.pdfIn PDF document text
    • http://futimisdev.com/userfiles/file/rulozobifuj.pdfIn PDF document text
    • http://kedehg.com/ckfinder/userfiles/files/47465933410.pdfIn PDF document text
    • https://dammesliepas.lv/ckfinder/userfiles/files/vomeleka.pdfIn PDF document text
    • https://adetexfoamgroup.centralcms.cloud/galeria/files/kokusosonezo.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/xoxin.pdfIn PDF document text
    • http://daydreamspin.com/userfiles/file/rokode.pdfIn PDF document text
    • https://ipekyolumedya.com/resim_galeri/file/gebulemuxivujapo.pdfIn PDF document text
    • http://abnicum.ru/files/file/xijalowajitorevumigenum.pdfIn PDF document text
    • http://xn--80ab1a9a.xn--p1ai/sadm_files/88298840079.pdfIn PDF document text
    • http://toonesk.com/upload/32047143741.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/d3d9d14f45a2009cc21ed96742c3e51e/razeripuj.pdfIn PDF document text
    • http://sostrevalli.it/userfiles/files/48391036865.pdfIn PDF document text
    • http://wccflooring.com/userfiles/files/togukojokiwiduvitexutudow.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/52bef15f874496d2f736b5569f42efec/xibogejis.pdfIn PDF document text
    • http://forglory.cz/ckfinder/userfiles/files/fomimovamoxegaf.pdfIn PDF document text
    • http://gioiacompany.net/images/upload/file/lojig.pdfIn PDF document text
    • http://abdon.madteam.net/ckfinder/userfiles/files/22059834417.pdfIn PDF document text
    • http://www.reeder.ee/files/filemanager/sigat.pdfIn PDF document text
    • http://mikomisushiwc.com/uploads/files/munewelibufedizulenov.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d9645c0cbd---24071491674.pdfIn PDF document text
    • http://www.truca-taoules.com/ckfinder/userfiles/files/tupitazepo.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_off0000da31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA31 10612 bytes
SHA-256: f99641ee74400e336c15502d77912100adea68b096878a8813d7e7641f855d4a
font_01_sfnt_off0000f265.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF265 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A77 18368 bytes
SHA-256: 4aba4d4e66a89aaf4cb1021ff05392bdc4a7644cec94b230a1dc7abae127476a

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