Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b675d54f1256c04…

MALICIOUS

PDF

75.9 KB Created: 2021-08-10 22:56:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7b9f8491b3e169f7eaccb1e3e3fbe81e SHA-1: 1833d136866c3f3ae5d6091d9ef168656c289e3c SHA-256: 0b675d54f1256c044b99e20c73ce2fdfad20338720aa73d6ee4d866f0a30dc9f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. The file also exhibits characteristics of a link farm, with numerous external URIs pointing to potentially compromised or disposable hosting. These links likely serve as a lure to redirect users to phishing sites or download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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 http://ineke-ott.nl/keramiek-beelden-imagesfile/juzibijokiju.pdf In PDF document text
    • http://conganbacgiang.vn/app/webroot/uploads/files/betuduzofulagoges.pdfIn PDF document text
    • https://vokalensemble-vocembalo.ch/userfiles/file/1608287372.pdfIn PDF document text
    • http://gemculture.com/userfiles/file/rasenekewojaxanibujire.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/loh627lqksu54kv8cgjk0l940c/70993562739.pdfIn PDF document text
    • http://avvolodin.ru/upload/file/71872612451.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f92c51c48c0---gupajofadidudono.pdfIn PDF document text
    • http://solarexperte.ch/fckeditor/editor/images/file/72696888480.pdfIn PDF document text
    • https://www.webplease.it/wp-content/plugins/super-forms/uploads/php/files/qkgkrlj6bmi11u0omo4q800s27/53999735899.pdfIn PDF document text
    • http://domainecomps.com/documents/files/66833202369.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/ccd65b3356107ad7c803c32d356bb8ee/68795393287.pdfIn PDF document text
    • http://acm-medicali.it/userfiles/files/xasajekome.pdfIn PDF document text
    • https://fresh-cherries.com/ckfinder/userfiles/files/defufilewexut.pdfIn PDF document text
    • http://doradcyprawni.com/images/pliki/winedebin.pdfIn PDF document text
    • http://pensionpoint.cz/userfiles/files/zebirebavatekaw.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/6881fe8610fd566e5728b0be2154e8b2/47411974468.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/98g1rlur2es28615qu5ec4m8f9/80137376156.pdfIn PDF document text
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/60071351221.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160b6d99844b00---pokeduzugexeliv.pdfIn PDF document text
    • http://3e-recycling.ru/app/webroot/filesfiles/xazuwodujobogogimojome.pdfIn PDF document text
    • http://minerva-collection.net/files/files/29522451160.pdfIn PDF document text
    • http://sonkertrail.org/clients/9/92/9260a3c387aed4615f72c72c3a1da295/File/99399513664.pdfIn PDF document text
    • http://architettotoma.it/userfiles/files/65037923395.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=sri+lalitha+sahasranama+stotram+in+telugu+audio+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_off0000c339.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC339 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB50 11060 bytes
SHA-256: 278f864ed75a41baf90a3dad8f46d0daf6c0f33f915c75adffbd10ecbe95fc6f
font_02_sfnt_off0000f4aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4AA 16768 bytes
SHA-256: 0130e9867abfc4c1eaca8c582a5892abc4d4d0ea65c2b1ded767c809e45a1edb