Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5f6ab3a81c72b72…

MALICIOUS

PDF

78.7 KB Created: 2021-09-16 03:01:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f617fbc8999d2590489a13fb50531a74 SHA-1: 2b13d21734b7bfa4e0b0d626e118862c86c46c03 SHA-256: c5f6ab3a81c72b726cec230ed632411f747a1c583210ff0b5daafdf1732e29d5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous external links, many pointing to compromised or disposable hosting, suggesting a phishing or malware distribution attempt. The presence of a 'download button' heuristic further supports a lure-based attack pattern. ClamAV detection and ML classification strongly indicate malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://redskap.ru/userfiles/file/fifotamakavatiditi.pdf In PDF document text
    • http://xn--49s538bo8ux8c.net/userfiles/file/16402640226.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fb3c0b69c1---58922844955.pdfIn PDF document text
    • https://cian.hr/userfiles/file/45003443629.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614285ace1de7---wifarateseka.pdfIn PDF document text
    • https://biserica-izvorul-tamaduirii.ro/files/jasez.pdfIn PDF document text
    • http://chukguwang.com/files/fckeditor/file/72901759680.pdfIn PDF document text
    • https://abcoegypt.com/userfiles/files/51708832315.pdfIn PDF document text
    • https://rivieresoceanie.com/userfiles/file/muvumenetebuxuvasabak.pdfIn PDF document text
    • http://xn--brneneskontor-landsforening-b0c.dk/userfiles/file/65108133558.pdfIn PDF document text
    • http://www.vinoplaza.nl/img/upload/files/kekutorazabadasoxab.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/161329bf414fd9---39868843680.pdfIn PDF document text
    • http://kimbuunguyen.com/uploads/userfiles/file/74337361755.pdfIn PDF document text
    • https://ilonew.tasksplan.com/userfiles/files/tamigemizabumagevomiv.pdfIn PDF document text
    • http://jujucuisine.com/userfiles/file/gefudabelatipegi.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/logumokitefux.pdfIn PDF document text
    • https://clearpatth.com/userfiles/file/gawepam.pdfIn PDF document text
    • https://dgssu.com/upfolder/e/files/20210904104628.pdfIn PDF document text
    • http://ultrabeauty-ff.ru/userfiles/file/varujawuxugirowuwiv.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/161405044b4836---wirowuzego.pdfIn PDF document text
    • https://asiantms.com/ckfinder/userfiles/files/wopij.pdfIn PDF document text
    • http://hockeydh.com/files/ups/files/sutifipusew.pdfIn PDF document text
    • https://ketex.com/trcgp/ckfinder/userfiles/files/biwixiwedujev.pdfIn PDF document text
    • http://spreewaldpension-luebben.de/meineBilderAlbertGrundschule/file/lilepubezixu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=street+fighter+x+tekken+mobile+apk+downloadPDF link annotation
    • 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_off0000cce1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCE1 17764 bytes
SHA-256: 86637a633efa50598a674e7b3456a8659e3fb5fbf4594f98054b625fb546c708
font_01_sfnt_off0000fade.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFADE 11272 bytes
SHA-256: a129203e8c30c3f4829975440a7d350c4f7d8ba98358eeffa2abc5aaf52496c7
font_02_sfnt_off000114c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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