Malicious PDF — malware analysis report

Static analysis result for SHA-256 4535ac1bc965d163…

MALICIOUS

PDF

84.1 KB Created: 2021-07-08 12:42:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 33c6c9a39fa56dbb3dc044c89ff79a6d SHA-1: 09dfb549ff3a608ce9485bdebc237dedba00974e SHA-256: 4535ac1bc965d1639682ddabc6dba1d9a63b7b637d4f4f362b2cbfcc4b1b9d65
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL heuristics and AV detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ca8d3dbcb---19785949787.pdf In PDF document text
    • https://menu2uplus.com/images/file/72590239489.pdfIn PDF document text
    • https://digireg.se/upload/3179808623.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/1bb730d515c89d2679072e0f743b9bbe/rutabexezusogitofoloxok.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/69b34b88456e10737cf498a0508ae428/tetif.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/ik757ffg42scq6pvl9tbgt1ikq/12407260490.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/kr7lqpenpeu2v58jpatjdtk17t/jajuwifefumamisakadotuto.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608184f33e3c6---kowavisowowumu.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/28adcad7b96e17e7b4b23ecfc5cc7242/xamelozibelef.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160725ad1e2c08---80593499792.pdfIn PDF document text
    • https://unosms.us/userfiles/file/jirobanovizeru.pdfIn PDF document text
    • http://rszm88.com/upfolder/e/files/20210706075734.pdfIn PDF document text
    • https://anmimar.com/royal/userfiles/file/gugarisamexi.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a625fbdf87f---mopel.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b6164daca75---9645554921.pdfIn PDF document text
    • http://dges.in/userfiles/file/jusopikuposivu.pdfIn PDF document text
    • http://camera68gialai.com/uplaod/quangtri/files/16257515654.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160deda5726a3a---88116896906.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/bd19a930792267792b76cb88c94b0716/wazerekufelapowenaxe.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/jsfcurfllnv8gu1dorqudh4i4n/josaravelaf.pdfIn PDF document text
    • http://lmyc.net/clients/875386/File/29095013361.pdfIn PDF document text
    • http://namuvaldymas.lt/userfiles/file/30834013537.pdfIn PDF document text
    • http://richfield1962.com/clients/4/47/47516dc9824f3897220912ef171c404f/File/tipotibapofo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=new+age+musicPDF 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_off0000e7db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7DB 17204 bytes
SHA-256: d68993b049228010d9926f45f4227641cc0e8517e9c4947b8813c4cecca1cfef
font_01_sfnt_off00011499.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11499 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012cb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CB0 10268 bytes
SHA-256: 7507b707649200e7d6285945c3a4cc118b2fecbbe11ad4b64746b8bd722fca03

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