Malicious PDF — malware analysis report

Static analysis result for SHA-256 500d75e141f462e7…

MALICIOUS

PDF

88.2 KB Created: 2021-09-19 03:27:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f33f14159fd1043088a8a7475bf0a422 SHA-1: a029f2166839c46e4fd2cce78a3abe30cf3ce222 SHA-256: 500d75e141f462e79ff90b2605aab59796cbe11bbb60a263d1880163bfee744c
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 it functions as a link farm. 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, but the heuristic firings clearly point to a malicious link distribution pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://coretry.ru/uplcv?utm_term=screen+mirroring+android+to+ubuntu PDF link annotation
    • https://ahha.az/userfiles/file/sizezerozabekobeti.pdfIn PDF document text
    • http://batiment-tunisie.com/userfiles/file/6650640178.pdfIn PDF document text
    • http://katour.ru/admin/ckfinder/userfiles/files/paminadejifi.pdfIn PDF document text
    • http://ibookingkr.com/FileData/ckfinder/files/20210919_53670B38472E9302.pdfIn PDF document text
    • http://thainightjob.com/ckfinder/userfiles/files/95818646764.pdfIn PDF document text
    • http://geriatriccarenewjersey.com/userfiles/files/rogiriwanomefopikavomuve.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/vimilasipubu.pdfIn PDF document text
    • http://machin.kr/userData/board/file/77672470024.pdfIn PDF document text
    • https://sakkestadbil.no/userfiles/file/likunarinele.pdfIn PDF document text
    • http://dreamcatcherltd.com/userfiles/file/22626711716.pdfIn PDF document text
    • https://alharithiforcameras.com/ckfinder/userfiles/files/9645328457.pdfIn PDF document text
    • http://tg-focus.ru/userfiles/files/dutinerutowibosuwiwazabeb.pdfIn PDF document text
    • http://vandientuchinhhang.com/upload/files/tobubijejoresuxeluleva.pdfIn PDF document text
    • http://breakevenpoint.pl/uploads/editor/file/rasawupofetomij.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/27e2f673a500b2f32c4d8a6b8a696dbd/61299284808.pdfIn PDF document text
    • https://geneticapanama.com/userfiles/file/54410399087.pdfIn PDF document text
    • http://canshu.dlzj.net/upload/files/20210918083221608682.pdfIn PDF document text
    • http://pekbdt.com/filespath/files/20210906020859.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/161444e24bac58---11180980127.pdfIn PDF document text
    • http://petukmahaaaraj.com/userfiles/file/75638890454.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/63833226618.pdfIn PDF document text
    • https://footballsod.com/images/ck-uploads/files/galurikibefij.pdfIn PDF document text
    • http://www.bash.cl/media/file/90090209019.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/169a1537e9eff8a872c8e36a85ac344a/fawutuja.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_off0000ee37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE37 19692 bytes
SHA-256: cb6ac70f69400b3dc5cbfa845d0aff85aa32df23d3639a16c0cd1d78bbb190aa
font_01_sfnt_off00012263.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12263 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013a7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A7A 10816 bytes
SHA-256: 6209124ab76fe46b57518b075124b04ca7e790d9aae3b9be9b012028f8250427