Malicious PDF — malware analysis report

Static analysis result for SHA-256 f75c0af04b904a80…

MALICIOUS

PDF

71.8 KB Created: 2021-09-10 06:52:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9400a7e4bb4bfdb7190b9bf99b7d0212 SHA-1: e872568910312dce60ac04072e0b1e5a77fbc393 SHA-256: f75c0af04b904a802d95d87582362c044090907dc1551ae39eee258c914d8edb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories, suggesting a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://wastran.ru/uplcv?utm_term=galaxy+s5+stock+firmware PDF link annotation
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1612f730c26909---muzobanarumom.pdfIn PDF document text
    • http://geredekombiservisi.com/userfiles/file/49214151891.pdfIn PDF document text
    • http://ilkconstruction.com/Images/Media/files/gopukekowabip.pdfIn PDF document text
    • https://www.newhorizonscrisiscenter.org/ckfinder/userfiles/files/47625578584.pdfIn PDF document text
    • https://dallaslandscapedesign.com/media/files/87882612985.pdfIn PDF document text
    • https://wisestudentz.com/userfiles/file/67919137487.pdfIn PDF document text
    • http://hnsunnyfood.com/d/files/netigekox.pdfIn PDF document text
    • http://ibconsulting.it/userfiles/files/96398265875.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/lns26ghkorabr1jlqs804dtsh1/73243016847.pdfIn PDF document text
    • http://weifong.tw/fckimages/file/xewexojabujagepefo.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/161313c1301081---67301328526.pdfIn PDF document text
    • http://bronia.org/userfiles/file/juraraz.pdfIn PDF document text
    • https://rawoctane.com/uploads/file/51636991109.pdfIn PDF document text
    • https://www.jakketoes.be/ckfinder/userfiles/files/58538875607.pdfIn PDF document text
    • http://club-integra.ru/userfiles/file/gimetaxopox.pdfIn PDF document text
    • https://hijaustabilo.com/contents/files/muregavibovibiza.pdfIn PDF document text
    • https://thuaphatlaihanoi.net/uploads/files/vunikanefuketowepudun.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/j6vs330sj95jq1cgq54sfrtj98/kukutezuruwaxovivovazur.pdfIn PDF document text
    • http://susasoft.com/upload/userfiles/files/vunorofuwuvanazonuwutevax.pdfIn PDF document text
    • http://gmtshipping.com/attachment/file/99704121775.pdfIn PDF document text
    • http://abcgsgeds.friendship-match.com/upload/files/70790335141.pdfIn PDF document text
    • https://dmitrovka-zn.ru/admin/ckfinder/userfiles/files/bupikanebavepur.pdfIn PDF document text
    • http://texinpack.com/uploadfile/file///2021090600313312.pdfIn PDF document text
    • https://www.posluh.hr/ckfinder/userfiles/files/35271307024.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_off0000b625.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB625 16256 bytes
SHA-256: 964a7ff8d0db232da500ec6b45241f7503c83b6fb192229a0c2518dec0be04d0
font_01_sfnt_off0000e018.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE018 10960 bytes
SHA-256: 1ab795e4bb7e49385ed83357f2bf7c354341c753ac3daf376e39c2af7202d95a
font_02_sfnt_off0000f9b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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