Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc515930820c9638…

MALICIOUS

PDF

121.0 KB Created: 2021-10-17 09:02:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 8edd5ea19ae88537d8a64418b1100839 SHA-1: 947d2da8c4a4c92d9eac6a9448f00cc1cb534194 SHA-256: dc515930820c96389751c8765e013c01655175244dacb90a08880b78d98d438f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised CMS upload storage and disposable hosting, indicating a link farm designed to redirect users to malicious content. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classification strongly supports its malicious nature. While no scripts were explicitly extracted, the heuristic firings suggest the PDF's primary function is to act as a lure, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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 http://kronikarp.pl/ckfinder/userfiles/files/jadodugisekawefabalinuvi.pdf In PDF document text
    • http://asiavent.com/UserFiles/file///rovalanototadejo.pdfIn PDF document text
    • http://ingatlantv.tv/userfiles/files/10157055753.pdfIn PDF document text
    • https://movie2book.com/userfiles/file/4777705660.pdfIn PDF document text
    • https://pollackmihalyiskola.hu/ckfinder/userfiles/files/dexufujemiropinolawilokuz.pdfIn PDF document text
    • https://phunhai.net/upload/files/67346594564.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/5d8c41e1068612812ed72465d365f657/xirujafilonozilikolox.pdfIn PDF document text
    • http://keacg.com/upload/files/48560996308.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16162820c1a961---sefetukekodetolosuxotel.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/tuzunubukeporenox.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613d61afca753---79529949953.pdfIn PDF document text
    • https://ww150007.linebot.net/upfile/files/20211011074955.pdfIn PDF document text
    • http://ominocoibaffi.it/userfiles/files/pijuzok.pdfIn PDF document text
    • https://treasurehunterdetectors.solar-ovens.net/ckfinder/userfiles/files/87959654447.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4926a03bb681b8d7629b6ac63fd3ec77/7375867080.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/26ujvmje1ku7mevpdd6i0d513t/numefimif.pdfIn PDF document text
    • http://lumieye.com/userData/ebizro_board/file/47112416812.pdfIn PDF document text
    • http://strahyi.ru/images/file/disoduwunirevumuvoramamod.pdfIn PDF document text
    • http://sentezetutmerkezi.com/upload/ckfinder/files/80710466877.pdfIn PDF document text
    • https://www.aspart.ro/ckfinder/userfiles/files/99819387417.pdfIn PDF document text
    • http://biznesfishki.ru/files/userfiles/files/wixitasumaxaropileruwoju.pdfIn PDF document text
    • https://noticky.net/akce/fotky/file/podupesimevono.pdfIn PDF document text
    • http://s2group.pl/userfiles/file/petekem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/HTGXzuRVGb4/uplcv?utm_term=manitou+evangelical+free+churchPDF 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_off00017198.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17198 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000189aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x189AA 20544 bytes
SHA-256: 99fef7e5627d1e01f46be339a51c7f52abdfc1df0e54f50d88984158aa5f76e1
font_02_sfnt_off0001bec6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BEC6 10604 bytes
SHA-256: 175c8227d8b150cef08c40d64f007fc8f880798128fa4e2d9ca2cee3155a430a