Malicious PDF — malware analysis report

Static analysis result for SHA-256 10b9d2164530319f…

MALICIOUS

PDF

85.0 KB Created: 2021-09-08 17:30:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a5d57c86b6c729414e9d27e06da65198 SHA-1: 93e0455679b35d380cfa1fa14f84faa7737decd0 SHA-256: 10b9d2164530319f86f1969a7c9f34bd6e5da32159c2d09c28f35e1f9ab397ae
156 Risk Score

Malware Insights

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

This PDF was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The file contains numerous embedded URLs that form a link farm, pointing to various domains, some of which appear to be compromised. The primary purpose seems to be directing users to potentially malicious or phishing websites, as suggested by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics.

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 https://oniceh.ru/uplcv?utm_term=distribution+coefficient+of+benzoic+acid+in+benzene+and+water+pdf PDF link annotation
    • https://mimpiindah88.com/contents/files/43163823592.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/16133c21f2b936---lalus.pdfIn PDF document text
    • https://www.creativetalentnetwork.com/ckfinder/userfiles/files/fipesajefakigejoriwufeja.pdfIn PDF document text
    • https://servingltda.com/userfiles/file/90239707980.pdfIn PDF document text
    • https://marikakozmetika.hu/editor_up/39761322281.pdfIn PDF document text
    • http://secretlove.ch/ckfinder/userfiles/files/gobukeselulofolupolo.pdfIn PDF document text
    • http://istihdamhaberleri.com/upload/ckfinder/files/jodejewagorovu.pdfIn PDF document text
    • http://speckrepeg.by/UserFiles/files/9827862319.pdfIn PDF document text
    • http://0vote.com/ckfinder/files/65580950161.pdfIn PDF document text
    • http://cga82.com/admin/File/lujejavomenomezadose.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/bopolinororewonosum.pdfIn PDF document text
    • https://www.netcorp.hu/data/editorfile/28232470462.pdfIn PDF document text
    • http://aquaclub.hu/userfiles/file/vidatozetezilozosakupon.pdfIn PDF document text
    • http://zkqzl.com/uploadfile/file///2021090404200327.pdfIn PDF document text
    • https://thuanxuongmonmb.com/admin/webroot/upload/image/files/jugesorojot.pdfIn PDF document text
    • http://digjamaica.com/app/webroot/files/wivaligux.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/842c4436baf5bb077fe19435a8537b0d/13809128618.pdfIn PDF document text
    • http://upakuika.com/img/file/padosenebilewuwu.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb2ec1783f---dajirugoridogivel.pdfIn PDF document text
    • http://jinshi66.com/uploadfiles/files/62610536071.pdfIn PDF document text
    • http://thcscatquea.hoaiduc.edu.vn/ckfinder/userfiles/files/50658516872.pdfIn PDF document text
    • https://flour.co.uk/ckfinder/userfiles/files/62606807480.pdfIn PDF document text
    • https://spyboarcams.com/files/zolekikotoxaladokum.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_off0000e31e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE31E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB30 18904 bytes
SHA-256: 81a448b5e163e7a0ab845dc31225ac55035dbf6d4a85a60a4892f232fe656b1f
font_02_sfnt_off00012c85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C85 10952 bytes
SHA-256: bca3f7861df5dbd9026d8db574597dad3cb7f6df21db614541d9f6f465b4769c