Malicious PDF — malware analysis report

Static analysis result for SHA-256 b85d848e484246c9…

MALICIOUS

PDF

74.3 KB Created: 2021-09-03 22:09:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 17f00554acf5eafee22e366a7f2785bf SHA-1: 2fb72752f76885e949866df332fab5cbe8a194dd SHA-256: b85d848e484246c952ebcbb3c70fed7ecabca00976f9a7115efc0ac110ceebe9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. Several heuristics indicate the PDF is part of a link farm hosted on compromised or disposable domains, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://yesilkoyluleriz.biz/resimler/files/jukobudutawizetimezot.pdf In PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a62e15e42e9---19767911526.pdfIn PDF document text
    • http://herningbadintra.dk/app/webroot/upload/files/64285047590.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/353a5dc50266d01f9026b98eea942278/boledux.pdfIn PDF document text
    • http://technoauto.jp/js/upload/files/94033553211.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/54378668426.pdfIn PDF document text
    • http://igabana.com/upfolder/e/files/20210603202830.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/barjvqe8l9q4duglvu8qn01r1t/60280425949.pdfIn PDF document text
    • http://jmvlpslimited.com/ci/userfiles/files/nezujelupolekiva.pdfIn PDF document text
    • https://lacecinella.com/writable/public/userfiles/file/wivitewalu.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16084897eac3df---tegepikavilufog.pdfIn PDF document text
    • http://cokhitienvuong.com/uploads/files/87333212465.pdfIn PDF document text
    • http://theffirm.com/userfiles/file/97047079175.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa460e8cfe---45801571071.pdfIn PDF document text
    • http://alisawedding.com/upload/users/files/80433573000.pdfIn PDF document text
    • https://vntdc.com/upload/fck/file/wodokegizizu.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/025f7dc825fd9c9277762f382bf4480b/rewalabelidaxemudufa.pdfIn PDF document text
    • https://aldurra.ly/images-editeur/img/file/dedugezatapozozet.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161116e27a5a1f---sujotixaxobatidirulebesa.pdfIn PDF document text
    • http://willbramephotography.com/wutefavigikeni.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/da0adb4b45206cbf906a9d43277a78ca/pupikaxemalasogumi.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/ufj2cn0peb1lupkfgg46cu02lu/vumitutuzosijatafi.pdfIn PDF document text
    • http://xn--9d0b102a6wc3y4a.com/sa_upload/userfiles/file/20210726161915.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=numbers+words+worksheet+pdfPDF 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_off0000bfd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFD3 16968 bytes
SHA-256: 90aa0a5b0ad7477b827e1c2dd4abfcee4f077f0db728eca0b4d81a7ff2c2c898
font_01_sfnt_off0000eb2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB2C 10752 bytes
SHA-256: 11c24dba15a93926b1c935c32fa5265cf928aa9b4c1dd5be97ef2344d92a7b8c
font_02_sfnt_off000103c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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