Malicious PDF — malware analysis report

Static analysis result for SHA-256 96a8c8bb309ff305…

MALICIOUS

PDF

89.6 KB Created: 2021-09-09 12:15:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8b7245712388c9b1050c73f138018386 SHA-1: 03298e205ba14957d87fad55ee4fc458990d0ccf SHA-256: 96a8c8bb309ff30552057c0f47d8c9778b2cdd418f9bb7d11a4d6f3a789528c0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the URLs and the heuristic firings point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://pchome.uzai.ca/upload/files/kokapepazefug.pdf In PDF document text
    • https://cooperadora.grupocreartel.com/documentos/archivos/90120749684.pdfIn PDF document text
    • https://xn--fct8ml6mwue.tw/uploads/files/zasujupedugidolabebifa.pdfIn PDF document text
    • http://boldino-hotel.com/ckfinder/userfiles/files/bomebitivuw.pdfIn PDF document text
    • https://eurochen.com/UpFiles/WebEditorFiles/file/15934840195.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/a2qirmhquh1tt4ghc63d0lgff4/30621519149.pdfIn PDF document text
    • http://lnhaihui.com/userfiles/file/20210902010838_371350852.pdfIn PDF document text
    • http://longarmquiltingacadamy.com/fckeditor/userfiles/file/tuduvixakepapefa.pdfIn PDF document text
    • http://fd-health.com/upload/ckeditor/files/rakavedeleziv.pdfIn PDF document text
    • http://xn--80aaae7amexjfdlfdfg.xn--p1ai/files/file/pugugewewutisafaxizafos.pdfIn PDF document text
    • https://horizontire.com/userfiles/file/nipugonuvo.pdfIn PDF document text
    • http://sewakendragroup.com/userfiles/file/rovexegur.pdfIn PDF document text
    • https://glaskunstcentrum.nl/images/file/51465392008.pdfIn PDF document text
    • http://thanhnhomdinhhinh.net/uploads/files/18901001589.pdfIn PDF document text
    • http://bukharageorgia.com/sites/default/files/file/53226646973.pdfIn PDF document text
    • https://tucarrorentacar.co/ckfinder/userfiles/files/fifukilef.pdfIn PDF document text
    • http://panteres.com/files/files/78255091456.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/5f7b6246e55e0d75c67d45fbf42978da/24392021445.pdfIn PDF document text
    • http://wrtour.com/FileData/ckfinder/files/20210901_FDEF5E0643DC9B9C.pdfIn PDF document text
    • https://superchills.com/userfiles/file/48625601748.pdfIn PDF document text
    • http://z-him.ru/userfiles/file/sirivirufuvukelirewun.pdfIn PDF document text
    • http://kiddeefire.com/media/userfiles/files/dibatubedusaxedavox.pdfIn PDF document text
    • http://happyhanool.com/ckupload/files/fawip.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161353e367aa0a---65929270751.pdfIn PDF document text
    • http://vekosgroup.ru/userfiles/file/26457660083.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=i9060i+repair+firmwarePDF 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_off0000fb7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB7D 17528 bytes
SHA-256: 4d33e11857414d98ff5b8a24938f5e55cfdbea3284bac0228c7312565b1d18af
font_01_sfnt_off000128fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128FC 10480 bytes
SHA-256: 81d1af66a3467ae76359624cb4a0dacdafa1e213f1215dbf39296c6875fcd006
font_02_sfnt_off000140d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1