Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1c42f1db6381f84…

MALICIOUS

PDF

85.8 KB Created: 2021-09-16 21:07:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ba696c585ef375c95ada9a6fbc43e13a SHA-1: 26084bfa227a5064781a39a6786fa21e1867540d SHA-256: a1c42f1db6381f843aec9b701589db35b3036aa8188851b501e1ddf32d635d41
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the links and the PDF structure point towards an attempt to exploit users via malicious redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 http://choinka4x4.org/cms/files/file/91322159308.pdf In PDF document text
    • http://graviroz.hu/ckfinder/userfiles/files/lipulomutuwuki.pdfIn PDF document text
    • https://tomaszbizon.tomaszbizon.pl/web/uploads/files/65939372265.pdfIn PDF document text
    • https://mamalight.net/business_school/uploads/file/petabisegazigusajev.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/e177723721f41b1a704f982f6b92d1d1/30637736494.pdfIn PDF document text
    • http://texmet.pl/userimages/file/fakizanoxemajejo.pdfIn PDF document text
    • https://www.fishhabitatnetwork.com.au/application/third_party/ckfinder/userfiles/files/66808355663.pdfIn PDF document text
    • http://pm-property.pl/userfiles/file/17904871814.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/67f7a5128a9f10c541166e45ed59e04a/54816101015.pdfIn PDF document text
    • http://sinocelltech.com/filespath/files/20210916222340.pdfIn PDF document text
    • http://hotelamadeustorino.com/userfiles/files/45026071851.pdfIn PDF document text
    • http://szpital-sulecin.pl/images/fckfiles/file/tuputejupabifasujog.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161324d33614b9---verozegi.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/fee5fdd372749db25aa65aa33ab88f9e/nizuxokodipaxa.pdfIn PDF document text
    • https://shreegroupco.com/userfiles/file/supimulirivebinu.pdfIn PDF document text
    • http://agisma.ru/files/pages/files/4676529425.pdfIn PDF document text
    • http://185.33.116.145/~acus01/upload/files/87774952119.pdfPDF link annotation
    • https://technoarc.net/userfiles/file/95594137317.pdfIn PDF document text
    • http://fc-junajted.com/upload/datoteke/gojipu.pdfIn PDF document text
    • http://wasserburg.pl/userfiles/file/gidimiwegemipinogotubaj.pdfIn PDF document text
    • https://fuze-pay.com/ckfinder/userfiles/files/11210032562.pdfIn PDF document text
    • http://cybernet-ap.com/UserFiles/File/47482345323.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/161408ae95090d---xarizuzamaset.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=n+gage+emulator+androidPDF 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_off0000e3c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3C7 20728 bytes
SHA-256: 9247fcdb8a23c846ea87af14f4ba291053994606b86b9f4b1e11a263a313a517
font_01_sfnt_off00011a1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A1D 10500 bytes
SHA-256: 69ff33b06d3d9f26fa3d8d70e759339970e63c2b74485f10e12689bebfcd07ad
font_02_sfnt_off000131b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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