Malicious PDF — malware analysis report

Static analysis result for SHA-256 c12129f88e792956…

MALICIOUS

PDF

82.6 KB Created: 2021-09-16 16:23:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8683a1f6a8fe419e552896421be9f0f5 SHA-1: 7bceb087f4ba5dddd0598677cdd2fb4f95441760 SHA-256: c12129f88e792956443d788b9220ee27367d8a9953bfca333cf20ba81559bd8e
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various domains, many of which are identified as link farms on disposable hosting or compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and link farm heuristics suggests the primary goal is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://queure.ru/uplcv?utm_term=sorry+root+access+is+not+properly+installed PDF link annotation
    • http://dywin.com/uploadfile/files/41026172856.pdfIn PDF document text
    • http://asfalon.com/__files/file/tibotatonejo.pdfIn PDF document text
    • http://bckbytow.naszbip.pl/img/upload/files/35075861464.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/a503161d2a138af0db617fab2d7d234e/xejiju.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135f21f8a74e---zitekib.pdfIn PDF document text
    • http://rc-modeller.se/images/file///51240617268.pdfIn PDF document text
    • http://budoprojekt.eu/obrazy/file/mogedixanomufe.pdfIn PDF document text
    • http://sp3siemianowice.pl/userFiles/files/nurofumudazumug.pdfIn PDF document text
    • https://vinasimex.com/uploads/file/35632489064.pdfIn PDF document text
    • https://autoprofi.ua/userfiles/file/ludawesijununozoruf.pdfIn PDF document text
    • https://rimsball.com/ckfinder/userfiles/files/gilasupijarefosuzalaniv.pdfIn PDF document text
    • https://leonardscopysystems.com/home/leonards/public_html/ckfinder/userfiles/files/nisozel.pdfIn PDF document text
    • https://trvstore.com/userfiles/file/76666848825.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/trnk52jhj405qd2oqth6t4n3hh/96117738267.pdfIn PDF document text
    • http://studioturina.com/userfiles/files/21106025077.pdfIn PDF document text
    • http://nhakhoasaigonkimcuong.com/uploads/images/files/87110656639.pdfIn PDF document text
    • http://webs123.com/userfiles/file/zujufujoluxejeporifib.pdfIn PDF document text
    • http://feldbach-tourismus.at/files/98921011191.pdfIn PDF document text
    • http://xingzhongjing.com/userfiles/file/20210908153336_1907520277.pdfIn PDF document text
    • http://cascad-trans.ru/files/42048600940.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210916170401.pdfIn PDF document text
    • http://verduciautodemolizioni.it/userfiles/file/72631061406.pdfIn PDF document text
    • https://hk-delight.com/UploadFiles/file/pulewikenegovixumedisesof.pdfIn PDF document text
    • https://mokhalasati.com/userfiles/files/55997454456.pdfIn PDF document text
    • https://sunridgecorp.com/uploads/files/202109081936354273.pdfIn PDF document text
    • https://phu-komplex.pl/pliki/file/95473747111.pdfIn PDF document text
    • http://purofirstli.net/userfiles/file/lagodiwek.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_off0000dbd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBD7 18276 bytes
SHA-256: 6a881de282639a4b599178cdaa753858714e1c3b453b71af70e1f264b786a7eb
font_01_sfnt_off00010bff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BFF 10696 bytes
SHA-256: f58f8a6198ad36c0b9d2f82185b03c676f596444d5d4a5b298a4593949ca8d40
font_02_sfnt_off000124a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.