Malicious PDF — malware analysis report

Static analysis result for SHA-256 08a06f44ca3bad51…

MALICIOUS

PDF

81.9 KB Created: 2021-09-17 01:55:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 1f093b0899b3a72ed56c4c4993ec7b78 SHA-1: 7823384f2d3d047619a0736f1a66ce34ea9f42bc SHA-256: 08a06f44ca3bad5107a9a84db575b220127fcdafddf9e2a6b04abc1fea9a1312
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple links to compromised websites, including WordPress installations, suggesting it is part of a phishing campaign. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to download a password-protected archive, a common tactic to bypass security scanners. While no scripts were directly extracted, the presence of embedded URLs and the ML classifier's high confidence score point towards malicious intent, likely to deliver a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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=cleo+scripts+zip+download PDF link annotation
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614227c32f94b---mifejutuzeselidozuta.pdfIn PDF document text
    • https://cjsc.se/ckfinder/userfiles/files/84108480583.pdfIn PDF document text
    • http://specimport.by/files/files/kemuwijexidofaxaraxof.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133276902196---47857212974.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/7lkc23bba683peui2qbf8rup36/bavebuvegodubu.pdfIn PDF document text
    • http://bestofbeer.ru/ckfinder/userfiles/files/78244095052.pdfIn PDF document text
    • http://noahmission.org/dataroom/file/luredejik.pdfIn PDF document text
    • https://vicotelecom.vn/static/source/images/file/napedaraduze.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1613dab1d394f5---23244717509.pdfIn PDF document text
    • https://eternalbliss.net/file/rejuzorogawub.pdfIn PDF document text
    • http://rnralpha.cz/res/file/fovepu.pdfIn PDF document text
    • http://ventima.ru/userfiles/file/gudomemig.pdfIn PDF document text
    • http://coumert.com/images/file/xuxakawavimogoso.pdfIn PDF document text
    • https://zoldlepes.hu/userfiles/file/puzuxototado.pdfIn PDF document text
    • http://agriturismolescuderie.eu/userfiles/files/53134490635.pdfIn PDF document text
    • http://rafaelstore.ru/upload/files/46555107155.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/c63436e6593c1ae7e65e7bf4049b7c69/gasenovobizufeniwifurej.pdfIn PDF document text
    • http://kapfenberger-schuetzenverein.at/userfiles/file/95301389255.pdfIn PDF document text
    • http://goksirkrupskimlyn.pl/img/upload/files/51845084977.pdfIn PDF document text
    • http://webbuilders.com/files/file/tunak.pdfIn PDF document text
    • https://rubenferro.com/userfiles/file/98224710613.pdfIn PDF document text
    • http://needychild.org/ckfinder/userfiles/files/ximabitofulara.pdfIn PDF document text
    • http://simonhoirup.dk/userfiles/file/gunubazaguvopuvafuzol.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_off0000d9dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9DC 10684 bytes
SHA-256: e4341c2c7a48d90a70143ab9c6e00da20ffc8105b99b221e17f3f0174ba02ea1
font_01_sfnt_off0000f297.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF297 18124 bytes
SHA-256: 8ef5e755a25f8265729339b7c47c6458a211132a0d6df8c034cb4851a5c46e02
font_02_sfnt_off000121e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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