Malicious PDF — malware analysis report

Static analysis result for SHA-256 9eb345bc4594a41c…

MALICIOUS

PDF

87.6 KB Created: 2021-09-03 04:56:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 93e311aeb39f518cbe299c019e08e12a SHA-1: 8afdb654b1734828a0cebdb6f29c1e5f62cda2f0 SHA-256: 9eb345bc4594a41cf5e7d3bfac0d5f92bd671bea0483aaeff3edbb090e54148f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm, with several URLs pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to lure users to malicious sites. The document body was unreadable, but the presence of numerous links and the high detection scores strongly indicate a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/vixanuv.pdf In PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa98949d458---zugawilo.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/15591075032.pdfIn PDF document text
    • https://tenshinorchids.com/FCKeditor_upload/file/49521728729.pdfIn PDF document text
    • https://rosycaffe.com/file/dazub.pdfIn PDF document text
    • http://jjc-dev.com/userfiles/file/vubinivite.pdfIn PDF document text
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/21a2f387b45d4797132cefdb7716d975/nixopijofi.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/ec2a9b0377d8561519375e51bb83ddd1/kotovozosokuveg.pdfIn PDF document text
    • https://www.pollackmihalyiskola.hu/ckfinder/userfiles/files/ruzuxazovufo.pdfIn PDF document text
    • http://moscow-vernisage.com/files/files/jegekomote.pdfIn PDF document text
    • https://bk.knu.ac.kr/ckfinder/userfiles/files/57121090187.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16109940e5a102---42467030812.pdfIn PDF document text
    • https://takipbizde.com/calisma2/files/uploads/vuwip.pdfIn PDF document text
    • http://starma.pl/files/file/tufodefipalesupokabileje.pdfIn PDF document text
    • http://azseal.net/uploads/userfiles/file/62564236637.pdfIn PDF document text
    • http://tt-ural.su/admin/ckfinder/userfiles/files/lepasidov.pdfIn PDF document text
    • http://blbr365.com/userfiles/file/1621497191.pdfIn PDF document text
    • https://sanruouvang.net/images/uploaded/file/43483633561.pdfIn PDF document text
    • http://stalmost.pl/userfiles/file/52961276254.pdfIn PDF document text
    • http://velapower.com/glwh/UploadFile/file/2021081012531973499.pdfIn PDF document text
    • http://mtlebanon62.com/clients/5/5e/5ee551a8be14a26d7d76bc5e90dd1372/File/89605592281.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/16075bf76d6533---tagose.pdfIn PDF document text
    • http://sriagasthiyarastro.com/FCKeditor/userfiles/file/45553631356.pdfIn PDF document text
    • https://zlato-eu.sk/upload/files/50198192714.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=inspired+3+student%27s+book+pdfPDF 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_off0000ee59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE59 18504 bytes
SHA-256: 8a40d179fe3c3fceab9b3c1fb26a3ca88713c7a8ac5858abd2660b3ee5339508
font_01_sfnt_off00011e24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E24 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001363b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1363B 10772 bytes
SHA-256: 53b311fb5a2f47026efcdb88b66c9d6d99f0f9ae0abf05404e35a832c1ff762e