Malicious PDF — malware analysis report

Static analysis result for SHA-256 c707a0ca26068534…

MALICIOUS

PDF

69.7 KB Created: 2021-09-06 02:00:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 986cf61d5e8223fb8e112f0274332504 SHA-1: 30f067dc69b7c9d0e44edd5a66139a46cb4340af SHA-256: c707a0ca26068534795e1f6c2ba1b1eada4c161a230e289a55f2b595369f99cd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to numerous external URLs hosted on potentially compromised or disposable domains. While no scripts were explicitly extracted, the nature of PDF exploits often involves embedded JavaScript to facilitate redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://synerhu.ru/uplcv?utm_term=anemias+carenciales+pdf PDF link annotation
    • https://apz-arte.com/ckfinder/userfiles/files/kokidotakoruveji.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/fc4c46d427a84dc48d8405a9dbbe24f6/wenoximurozaro.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1610c6ed086ad2---30275511625.pdfIn PDF document text
    • http://plenaseguroseprevidencia.com/fotosempresa/files/logimewe.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086596c23314---kuxezeb.pdfIn PDF document text
    • http://chobacgiang.net/webroot/img/files/22443929809.pdfIn PDF document text
    • http://metapolar.hu/tmp/36864533213.pdfIn PDF document text
    • http://jmk.kr/ckfinder/userfiles/files/livodalularimiferuli.pdfIn PDF document text
    • https://afmiletisim.com/resimler/files/jutilorewol.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1607081a915767---xewesegonekajogarobo.pdfIn PDF document text
    • http://icmasistemas.com/userfiles/files/pezegogefomulosizakusure.pdfIn PDF document text
    • https://mimpiindah1.com/contents//files/22265264255.pdfIn PDF document text
    • http://tweedehandswikkelaar.nl/app/webroot/files/userfiles/files/sugixemep.pdfIn PDF document text
    • https://ntpuvoice.com/ckfinder/userfiles/files/maxigu.pdfIn PDF document text
    • http://vejwun.cz/images/16080721785.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610ea9dda3ded---2115033575.pdfIn PDF document text
    • http://trevelsi.ru/ckfinder/userfiles/files/sawakixubaluxe.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/24eed55e4a0fa9d824e6f63d24c56253/99648986411.pdfIn PDF document text
    • http://ecole-belair.com/ecole/file/rariruxok.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160aba6e51adf2---2993959538.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b34c68b9014---bilunajakopegikoki.pdfIn PDF document text
    • https://grootformaatspandoeken.nl/userfiles/file/feguw.pdfIn PDF document text
    • https://kermoulin.com/userfiles/file/berefofoxiwokuvo.pdfIn PDF document text
    • https://egyiksem.hu/uploads/file/jisoposoginalogare.pdfIn PDF document text
    • https://comfortinnbarrie.com/phpsites/vertical_living/uploads/file/lelojajipiridesuduzupu.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_off0000b3cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3CD 10544 bytes
SHA-256: c8af85b7e37a5b73f4aff7e79180ff9b34fe06642f9df8dea9357ef06a8bfdf3
font_01_sfnt_off0000cbb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBB9 15172 bytes
SHA-256: e5324b41eba6588b861fdf5881cf206bc06b3fbb92ea6c756b0e7f4885ed1d6b
font_02_sfnt_off0000f15d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF15D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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