Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b502588d4697660…

MALICIOUS

PDF

84.3 KB Created: 2021-09-01 14:58:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b49691b30043c5cc321e7351fdfb5930 SHA-1: 9e6f846f9e174c04c475bc90c054cdd1b2388204 SHA-256: 2b502588d46976600fa961c12e5d42f6529a61d5d345c6a87a8d309ce42891e1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and links to compromised CMS upload storage, indicating a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://ketchas.ru/uplcv?utm_term=cultural+anthropology+4th+edition PDF link annotation
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/17587054131.pdfIn PDF document text
    • http://omgmediatank.com/userfiles/files/13948701127.pdfIn PDF document text
    • https://cicadit.ro/UserFiles/file/jumilulubo.pdfIn PDF document text
    • https://anglarill.net/userfiles/file/79501030218.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16082dde3c31b8---20354421292.pdfIn PDF document text
    • http://prestopc.it/upload/file/watakapat.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd8196e7803---90056197760.pdfIn PDF document text
    • http://sochi-vitrazhi.ru/ckfinder/userfiles/files/dupagazefexasugal.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/10128714914.pdfIn PDF document text
    • http://huile-de-nigelle.info/userfiles/file/29559494183.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161182dd8936fb---72529799253.pdfIn PDF document text
    • http://jarosi.hu/files/file/77927048204.pdfIn PDF document text
    • http://hz-kontejnery.cz/ckfinder/userfiles/files/47204797775.pdfIn PDF document text
    • https://www.fishhabitatnetwork.com.au/application/third_party/ckfinder/userfiles/files/3577247556.pdfIn PDF document text
    • https://kemxoi.vn/app/webroot/files/images/pages/files/81567726365.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160947bea7fcd4---89919675439.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f672d0881ea---61692084043.pdfIn PDF document text
    • https://hitourkorea.com/FileData/ckfinder/files/20210821_BAC4CBCB0C31339F.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/j5cal9l9uodptiu04dpc88vgue/bagigaxirebajusirumu.pdfIn PDF document text
    • http://automozg.by/upload/editor/files/ruweziwakogusemobupanejeg.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/84254512960.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1612aca539b518---42119277106.pdfIn PDF document text
    • http://mobiliteit.nu/files/zaworubajimewugijavewa.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/62535485766.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_off0000e2b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B6 10828 bytes
SHA-256: a0f4d66a2ea676af3e3957095c624a1707ec52d417cd34eb6581d6737765d996
font_01_sfnt_off0000fb72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB72 18288 bytes
SHA-256: 93e4a3da39f813e855f6cd62fdfc552485a003691a59453a2a8b818630ed30eb
font_02_sfnt_off00012b08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B08 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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