Malicious PDF — malware analysis report

Static analysis result for SHA-256 b87bfb2ec9628320…

MALICIOUS

PDF

86.2 KB Created: 2021-08-30 11:17:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: cc00972efa7f068ddc0b0998bf937bd0 SHA-1: ef9a0e4aa85af632c6c3cebbc1c4918466ceb14c SHA-256: b87bfb2ec9628320af7bfe4bcf69237f5fa5af345178a04cbb4158a77487896b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to potentially compromised WordPress upload storage and other disposable hosting, suggesting it functions as a link farm to distribute malicious content. While no scripts were explicitly extracted, the nature of the links and the detection indicate an attempt to redirect users to harmful sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://55pluscommunityspecialist.com/userfiles/files/59561198477.pdf In PDF document text
    • http://mjsolankifoundation.com/fck/imagesfile/vokarotoli.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/vup69c1rs1ggfteqqnpq58d03m/vegenelejurilediwazater.pdfIn PDF document text
    • http://eptesteplelek.com/uploads/file/lofogopefesinoru.pdfIn PDF document text
    • http://accessoriesunlimitedinc.net/catalog/file/91834955306.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/wegafolilowenefopebevo.pdfIn PDF document text
    • http://ed-web.cz/userfilesfile/39120200063.pdfIn PDF document text
    • http://htwy.com/upload/file/57961169217.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160e1410e75e8a---mudukovojogifukulepe.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021051000475861.pdfIn PDF document text
    • http://astro2sphere.com/admin/images/file/xegenoxi.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/375imib9l7fp1hiocfnsrrre6k/debelu.pdfIn PDF document text
    • http://e-sportis.com/images/upload/83938721667.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/n3h0c6geuac7o1v45sj8ga0995/tewoletenatemepoxe.pdfIn PDF document text
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/up86kflmhpqki2pk0d7ns2lqf0/54894412353.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/5fvecn5td167ouc392hknspve0/bexar.pdfIn PDF document text
    • http://rurisnet.org/images/file/pusuni.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/21g49t4afap2s4ebl2q7tpfag7/raxifidifufuzom.pdfIn PDF document text
    • http://ubest.ru/images/file/ziboge.pdfIn PDF document text
    • https://brakos.it/file/12418949546.pdfIn PDF document text
    • http://miele-service-center.ru/uploads/files/fifanetubavanalefupa.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/360971fd17ea758920853076859c4aee/89445958777.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d7eec83b4c4---lijixafunajivapuw.pdfIn PDF document text
    • https://quangcaonoithatgiahung.com/admin/webroot/upload/image/files/musuneredafenezafas.pdfIn PDF document text
    • https://digidatadecolombia.com/wp-content/plugins/super-forms/uploads/php/files/95f7530fbf6e73da4b4d41504b3ccdc7/mosifewojibajisodegebuda.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083f74e071ad---66754673603.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=obvious+to+seePDF 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_off0000e83c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE83C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001004e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1004E 19660 bytes
SHA-256: 90fe2ff90e4727a814d244c8db7f4d42833d994d32f3b8614edddaf0df14c733
font_02_sfnt_off00013261.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13261 10020 bytes
SHA-256: 83640ede872f0665a0c6098a663a4036cc786bee2e3c818a2f42208f6302307d