Malicious PDF — malware analysis report

Static analysis result for SHA-256 e530cb9990f764c5…

MALICIOUS

PDF

92.5 KB Created: 2021-09-04 03:37:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cbd5cd52352bb144e3bf84a421658ab9 SHA-1: c15eca8f534db9a2335c31005b912fb096a62c1d SHA-256: e530cb9990f764c59b848d2f3c1c202fdba1cf29fd541982e6a803cbf36fbecf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and the presence of external links are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/vlv8id7bm5poqsrrrqot4h686k/tematomu.pdf In PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc7d7d0c38e---36072401621.pdfIn PDF document text
    • http://jorakaygame.com/ckfinder/userfiles/files/58760227085.pdfIn PDF document text
    • http://hoteldanang.vn/uploads/images/files/45083307115.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/46213129045.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160743b6794ded---69912149634.pdfIn PDF document text
    • http://1982thsreunion.com/clients/a/a8/a85c6617a93da1462bf6c3e7dda9c043/File/62881527774.pdfIn PDF document text
    • https://hoakhanh.vn/uploads/image/files/jifuzawepi.pdfIn PDF document text
    • https://laser123.com/geektic/files/17602707004.pdfIn PDF document text
    • https://propactionvehiclesuk.tv/userfiles/files/digelonav.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a9a8b2894f3---nuvimubeposivexebudir.pdfIn PDF document text
    • http://xingzhongjing.com/userfiles/file/20210829015333_1962243694.pdfIn PDF document text
    • http://kaushalacademy.org/ckfinder/userfiles/files/15231747845.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/np18ra684sai887cudhreubsg4/pesunazof.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612bf44200233---87367230516.pdfIn PDF document text
    • https://wolfgang-photography.com/userfiles/files/gusubofedepup.pdfIn PDF document text
    • http://mateuszkucharski.pl/admin/file/pimog.pdfIn PDF document text
    • http://ehoron21.mn/uploads/files/xavileseliveresiluf.pdfIn PDF document text
    • https://inverpalmas.com/aym_image/files/51745744450.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/pemoni.pdfIn PDF document text
    • http://studiocommercialedelpiano.it/userfiles/files/jovakopigepezevug.pdfIn PDF document text
    • http://mariekevanvlierden.nl/survey/userfiles/files/xaxudup.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1608706128674a---kijusaruxuvekufafogejiko.pdfIn PDF document text
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/dfefb20e53b90d0d3f92cf794b73583b/motaw.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075504290290---21401710179.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=2006+mercury+mariner+hybrid+owners+manualPDF 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_off00010216.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10216 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011a28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A28 18272 bytes
SHA-256: 71b50e4b028a5bbd76ecab9429feda2f12d218e818b076991149a96ba0000c85
font_02_sfnt_off000149b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149B2 11288 bytes
SHA-256: 946b1a507574205a8403f2189e607a9011fd40c80be76f477c62d1aea1ee5f8f