Malicious PDF — malware analysis report

Static analysis result for SHA-256 cde5d3cfde3f00e3…

MALICIOUS

PDF

71.3 KB Created: 2021-09-16 19:19:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d0d9f5a6cf31a53523110f09d48e9a50 SHA-1: ede1e9212d327f577623692ce08a858aadcf5490 SHA-256: cde5d3cfde3f00e38599af1abc9b96fe9f2b341da32161d2be733e7bd4e704ac
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware hosting sites. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/4ei4bm995qb126gro37pc0jlk4/polekep.pdf In PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161319d2c9c1f7---90612360613.pdfIn PDF document text
    • https://mcq.bmtinhoc.vn/InteriorWeb/images/images_news/files/73903137915.pdfIn PDF document text
    • https://invest.pl/userfiles/file/91684489041.pdfIn PDF document text
    • http://www.solarwindependence.com/ckfinder/userfiles/files/somejuxem.pdfIn PDF document text
    • http://moriefrusca.com/userfiles/files/91052433168.pdfIn PDF document text
    • https://aldwalia.com/userfiles/files/mumiwage.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/161355f8e005b6---46369403820.pdfIn PDF document text
    • http://vendsol.com/userfiles/file/8939250812.pdfIn PDF document text
    • https://www.sesc-am.com.br/Selecao/ckfinder/files/fepidapegu.pdfIn PDF document text
    • http://cofetariafraguta.ro/UserFiles/file/94381632059.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/93f5bff6ea43835c957d47c8e8bf76c4/zawix.pdfIn PDF document text
    • http://lexus-custom.com/js/upload/files/51404646312.pdfIn PDF document text
    • http://jia-longsofa.com/uploadpic/jialong151126/files/202109130322281357.pdfIn PDF document text
    • http://friulanamarmi.it/images/file/mefodeletug.pdfIn PDF document text
    • https://magazinul-de-instalatii-sanitare.ro/app/webroot/files/userfiles/files/wenizisefesadufupav.pdfIn PDF document text
    • http://fsnmmaterials.com/UPFILE/userfiles/files/xofesubugaboberivilol.pdfIn PDF document text
    • http://zubrcup.by/files/files/dililejijekerebijuvovu.pdfIn PDF document text
    • http://unewstoday.com/task/userimages/file/25197300468.pdfIn PDF document text
    • http://myslizdrave.com/soubory/ludokerilavaj.pdfIn PDF document text
    • http://www.vishalsahni.com/public/ckfinder/userfiles/files/jobamikatimenepamitat.pdfIn PDF document text
    • https://machnik.net/ckfinder/userfiles/files/23483534485.pdfIn PDF document text
    • http://cwesp.biz/upload/file/44020383060.pdfIn PDF document text
    • http://playitdirect.ca/ckfinder/uploadfiles/files/pezebexirope.pdfIn PDF document text
    • https://thediamangroup.com/_images/files/vufoxegubinasepu.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613139d0d99db---jalatotexixe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=cricket+live+watch+apkPDF 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_off0000b865.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB865 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d077.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD077 15564 bytes
SHA-256: 5d645df965ad464480848e57d34d46bc9d60ab4c5b8ad08855df75f0ee2e5c61
font_02_sfnt_off0000f831.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF831 10352 bytes
SHA-256: f419deaeff6d33387f04eba58ade2533bcf281f3afdfd025a9910edb9cdb4480

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