Malicious PDF — malware analysis report

Static analysis result for SHA-256 98dfe61be538e1dd…

MALICIOUS

PDF

76.6 KB Created: 2021-09-19 19:55:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b22e3dd82b3b3a83861888c067cc04f4 SHA-1: dd6557f65e826fcb9aa14b203c6330d2a09cae1d SHA-256: 98dfe61be538e1dd1155a7f15bd92f610de270dde9c6b7c2ed5afe195a57752c
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to various domains, many of which appear to be disposable hosting or compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' confirms the nature of the PDF as a link farm designed to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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=diary+ng+panget+full+movie+eng+sub+123movies PDF link annotation
    • http://tygodnikzuzlowy.pl/ckfinder/userfiles/files/39283658789.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/xikanomiboluzuxalamaf.pdfIn PDF document text
    • https://parfumzone.ro/files/file/vopegoxaja.pdfIn PDF document text
    • http://ginzaramen.us/uploads/files/medelafuzusenid.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/42054586637.pdfIn PDF document text
    • http://architettosirocco.it/userfiles/files/32277677245.pdfIn PDF document text
    • http://cottoneauto.it/userfiles/files/270188234.pdfIn PDF document text
    • https://empresa-venta.hr/files/26215688260.pdfIn PDF document text
    • http://sun-green.nl/ckfinder/userfiles/files/13437428053.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e2f5a3c89e---wodaxaduxomepogo.pdfIn PDF document text
    • http://wohntraumgmbh.at/95813933099.pdfIn PDF document text
    • https://8foro.exceltur.org/exceltur_nuevo/ckfinder/userfiles/files/bojuvisojo.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/c2c7040997ebd0f752d4f02a9e9527ce/texesov.pdfIn PDF document text
    • https://pezenasenchantee.fr/userfiles/file/50989190934.pdfIn PDF document text
    • http://fujieshubao.com/zk/UploadFile/file/2021090708545973499.pdfIn PDF document text
    • https://euronuts2009.ge/files/files/liwilumojorifubuvovafefib.pdfIn PDF document text
    • https://ladida.asia/sporlegen/administrator/imagetempfile/33656171446.pdfIn PDF document text
    • http://tsyrulnikov.ru/upload/file/31961445496.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130006edcdca---kukizopa.pdfIn PDF document text
    • https://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/7378114492.pdfIn PDF document text
    • https://luckyfood.itweald.com/uploads/files/613243f3e6a5a.pdfIn PDF document text
    • http://footstepfloor.com/upfiles/files/12105017898.pdfIn PDF document text
    • http://doggystylzgrooming.com/admin/photos/file/59989496411.pdfIn PDF document text
    • http://partner-support.net/user_data/userfiles/files/64222760993.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_off0000c2be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2BE 18208 bytes
SHA-256: b35be881910979569b0dfb2007cf5a018b10d276c595df863114ad8bab3c99ba
font_01_sfnt_off0000f1e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E6 11464 bytes
SHA-256: 4d6e813817978ae2c0a357b49703bfd6fb5c08c32c97f7c63f74d782d61f7e7f
font_02_sfnt_off00010cf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CF6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1