Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c5b542577230fe5…

MALICIOUS

PDF

79.8 KB Created: 2021-09-01 16:53:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e9f509e678241bf0ba6655bc71695d75 SHA-1: 59b185e9b20ea08052e1bba0a101e53d13737835 SHA-256: 2c5b542577230fe59a71291cc63d4fdedc593f022637dc9e8dd0b66a4ab66e6d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and ClamAV as malicious, specifically as a phishing or trojan delivery mechanism. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users. The ML classifier output of 0.998938 further supports the malicious classification. No scripts were extracted, but the presence of numerous external links indicates a likely intent to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://wastran.ru/uplcv?utm_term=bus+simulator+android+1 PDF link annotation
    • http://www.makattakasinti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082bb6b9aa80---34812694037.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8649fdab16---xalexirezuratu.pdfIn PDF document text
    • http://dijladentalcenter-qa.com/userfiles/file/suwerojunejetuka.pdfIn PDF document text
    • https://watfordfairtrade.org/app/webroot/img/files/kawubafenanoroxetemima.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/lsaakt8unmjdcu99keet6jnoq3/tebukal.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160854ceca197d---zonisop.pdfIn PDF document text
    • http://tucholainfo.pl/userfiles/file/wisosokidad.pdfIn PDF document text
    • http://kengosushionlineorder.com/uploads/files/gudixuxejidev.pdfIn PDF document text
    • http://old.bgk-meshkova.com/ckeditor/ckfinder/userfiles/files/73967271959.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/99fe4494ac6d50707517063739f3eed4/79267287628.pdfIn PDF document text
    • http://lbhs1965.com/clients/6/6b/6bdd8f708684a1f547efbf97e1630fe5/File/54441023853.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a94c4d59c24---lejugajorefer.pdfIn PDF document text
    • http://ezibra.pl/upload//file/dakaxefiberozamujafeb.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b113261cdd7---4549517884.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161107337b79ed---likejeban.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/016dde44395586ddc596c57d4b848c06/puwasupin.pdfIn PDF document text
    • http://kuppersbusch-center.ru/uploads/files/jasujutikimap.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dbefe34a88---kotanuzujazesuxobepozok.pdfIn PDF document text
    • http://bluebiz.kr/userData/board/file/zujojutagadera.pdfIn PDF document text
    • https://malikcolsys.com/userfiles/files/51046044293.pdfIn PDF document text
    • https://tonymusic.se/UserFiles/files/74997246004.pdfIn PDF document text
    • https://krassimirtaskov.com/userfiles/files/67397189670.pdfIn PDF document text
    • http://kahounova.cz/userfiles/file/zomewatetamiwi.pdfIn PDF document text
    • http://www.azurwelcomeservices.com/userfiles/file/77167551956.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_off0000d4e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4E0 10480 bytes
SHA-256: 58f8dfa422f3a796934c1aa55037e335f099ef1bd1edb21a972830b97d52a137
font_01_sfnt_off0000ecbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECBB 17308 bytes
SHA-256: 7834b2d5f1d4cb7a333365f0368402bde036d47ec4a71f6a6947c8357c629275
font_02_sfnt_off0001193e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1193E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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