Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5fe27cbf20faa3c…

MALICIOUS

PDF

85.9 KB Created: 2021-09-07 21:11:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0bdc413caaaff06bba370cd8a3d54d40 SHA-1: 66404eef4884df3938dfb402761eff1f5eeb0599 SHA-256: d5fe27cbf20faa3c3bb0a2048af81ed05444e2b7bbde33de24713e104436866a
156 Risk Score

Malware Insights

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

The sample was identified as malicious by ClamAV and an ML classifier. It contains numerous external links, many pointing to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to redirect users. The presence of these links suggests the PDF is intended to lead users to malicious sites for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://gesundimjob.at/images/content/files/62222325200.pdf In PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160813acd2476b---bodusemudeledik.pdfIn PDF document text
    • http://marketypik.pl/zdjecia/fck/file/nalimekofera.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1606d66802f9fb---ruwefijifas.pdfIn PDF document text
    • http://kaies.cn/upfiles/210530062007730531zxjgwg.pdfIn PDF document text
    • https://barcelonamedicalcenter.com/files/galeria/files/jojeguxug.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/a1ff2bda179857f07434500209ad15e9/kakojev.pdfIn PDF document text
    • https://pelicanfinancialnetwork.net/ckfinder/userfiles/files/46641279371.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/ta7mn5f5fhq7ln614qipkqbui3/97804049442.pdfIn PDF document text
    • http://sunriverps.com/data/editor/file/95424738555.pdfIn PDF document text
    • http://cgmorenanews.com.br/ckfinder/userfiles/files/lakafanavigaxuguru.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160753816cc407---95119033693.pdfIn PDF document text
    • https://sporyolu.com/resimler/files/bajinunovemozimokexuzo.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/61306767442.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1612356128b952---9172423010.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/b075890e0d2cc3dca0662fdc1530f88c/wixubisinal.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607398d4cb4c8---nivijejumudulo.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/161138254d7d7d---2410502471.pdfIn PDF document text
    • https://thegioibaobicarton.com/Images_upload/files/nujapu.pdfIn PDF document text
    • http://stepasidemedical.com/images/uploads/file/nowovik.pdfIn PDF document text
    • https://protradingindia.net/userfiles/file/7101426326.pdfIn PDF document text
    • https://lensmam.com/userfiles/file/38337017631.pdfIn PDF document text
    • http://bkm-market.net/userfiles/file/wawunupobo.pdfIn PDF document text
    • http://tuttotop.com/userfiles/files/mibikawuwixotefutav.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16090c0beb08e8---47908696451.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160fbe5136dcc8---19239786527.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=mushaf+full+novel+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_off0000e05f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE05F 23064 bytes
SHA-256: 556dde1bbaf558d077d934ee265b50d7cf00d67d678b4374d3a20fe1822c6d13
font_01_sfnt_off00011a10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A10 10464 bytes
SHA-256: d1b3c5d2ba199b4f0894fd7e7c38a60f132f8eafc254266ddbca0b413bf5f3d3
font_02_sfnt_off000131cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1