Malicious PDF — malware analysis report

Static analysis result for SHA-256 f42161a7081f7cce…

MALICIOUS

PDF

78.9 KB Created: 2021-09-20 01:32:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2caae8a89bab888fb92366b75462aac2 SHA-1: 632d9cf24a74dbadae3891e72ffebec27fa57117 SHA-256: f42161a7081f7cce576efe5b06d1f73cefbc3940f96063c2ad9b69154f820daf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm pointing to multiple domains, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest a phishing or malware distribution attempt. While no scripts were explicitly extracted, the ML classifier and ClamAV detection indicate malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://oreopay57.com/ckfinder/userfiles/files/sixatuwalinapupegabovoso.pdf In PDF document text
    • http://bolt.fo/public_html/userfiles/files/gubawakogomirududosaja.pdfIn PDF document text
    • http://edilcfcostruzioni.com/userfiles/files/wufelumakujafe.pdfIn PDF document text
    • http://101-games.ru/images/uploads/files/60529902477.pdfIn PDF document text
    • http://konditsionery-odincovo.ru/upload_picture/file/29355630932.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613c27928fef9---25443154384.pdfIn PDF document text
    • http://grupopiscis.com/upload/files/94843487996.pdfIn PDF document text
    • http://wmsone.com/eimages/file/somone.pdfIn PDF document text
    • http://tianlanlawyer.com/filespath/files/20210911111546.pdfIn PDF document text
    • https://ilonew.tasksplan.com/userfiles/files/bedagonunorobewokixuwu.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/43132a9b3d3dd010f73a2524f51322b7/kofadenovosawemasema.pdfIn PDF document text
    • https://tour-paris-guide.com/cite_imgs/file/17214362548.pdfIn PDF document text
    • https://malmospelmanslag.se/userfiles/file/22229954279.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/87282145365.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/161448bb6bb7b1---25326170714.pdfIn PDF document text
    • http://elitk.ru/_files/soterudikumukemiruxixani.pdfIn PDF document text
    • http://enricobarraco.com/files/pokofonekijudegada.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613eeebe8569a---zalel.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/bewafetevapef.pdfIn PDF document text
    • http://fantasymusic.it/userfiles/files/79103848198.pdfIn PDF document text
    • https://canionglobal.com/FCKeditor/file/musadedufuk.pdfIn PDF document text
    • http://cowmoo.org/ckfinder/userfiles/files/lujexotirodu.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/bffcd39395c395bb16c6f76ac3211539/43535411784.pdfIn PDF document text
    • https://jasz-pap.hu/UserFiles/file/wilovunusumakir.pdfIn PDF document text
    • http://realcomfort.ru/content/upload/file/gutemezitewum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=how+do+you+download+mobdroPDF 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_off0000d175.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD175 17448 bytes
SHA-256: 08692007b033eeb0404726903bef524291e324086f86cf0532cd556ea64166fc
font_01_sfnt_off0000fefc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEFC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011713.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11713 10352 bytes
SHA-256: 81b5e85f368bb5de6ffb5b1d4488378a9165cb35efd05bbc3bcd48fea6defd5f