Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fc3cb39d87c88e6…

MALICIOUS

PDF

77.9 KB Created: 2021-09-09 14:29:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 224ff8940c5e0f9859d48cc27ae8fda1 SHA-1: 167f3bf6561ace2a702b884f690582540051552c SHA-256: 6fc3cb39d87c88e6cb6ca5ad71cb7f7be0d70753118c7b28e0551e57a03cb63e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous URLs pointing to compromised CMS upload directories and disposable hosting, suggesting it functions as a link farm to distribute malicious content. The presence of these links and the PDF's structure strongly indicate an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161393f02dc640---nesimokapajitap.pdf In PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/nespmcb8hflpl40gi2evj5qtip/81365250210.pdfIn PDF document text
    • http://palakkadtourism.in/ckfinder/userfiles/files/95083870384.pdfIn PDF document text
    • http://ghibms.com/userfiles/files/3264755358.pdfIn PDF document text
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/roxaguwinuba.pdfIn PDF document text
    • http://polesprogettazioni.com/userfiles/files/98665274053.pdfIn PDF document text
    • https://rentcar888.com/uploads/files/202109022208548205.pdfIn PDF document text
    • http://gccde.com/downloads/blog/geust/files/75442062174.pdfIn PDF document text
    • http://yourhandmadeitems.com/userfiles/file/91519783016.pdfIn PDF document text
    • http://tlumacz-bialystok.pl/pliki/file/subobibaniwejet.pdfIn PDF document text
    • https://ehbo-oostkapelle.nl/userfiles/file/bamufolisiju.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/161357d007654f---9259260808.pdfIn PDF document text
    • http://www.neoneophytou.com/ckfinder/userfiles/files/77672903167.pdfIn PDF document text
    • http://riggi.ru/userfiles/file/94108637436.pdfIn PDF document text
    • http://icmasistemas.com/userfiles/files/82604607083.pdfIn PDF document text
    • http://nktrading.qa/file/files/93722370793.pdfIn PDF document text
    • https://jmbarrenetxea.soinuenea.eus/files/galeria/files/89958155696.pdfIn PDF document text
    • http://tfh-filter.hu/_user/file/nagajefif.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161312339d62db---86360394331.pdfIn PDF document text
    • https://matras-matrasych96.ru/admin/ckfinder/userfiles/files/64761300086.pdfIn PDF document text
    • https://mehfermobilsaglik.com/userfiles/file/35458365373.pdfIn PDF document text
    • http://loaamtran.vn/files/usersfiles/files/zabafinobezebovorenukof.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/9e5a3b9f956497703742519eafb5d383/41164282128.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/161365b36cad58---77522578953.pdfIn PDF document text
    • https://macroedunet.com/userfiles/file/66615836834.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=mortal+kombat+phone+game+cheatsPDF 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_off0000c0c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0C7 10956 bytes
SHA-256: fd63e2e48e381832be5389999a3fdfb012fde7067cdda02161eff681d44b3ed2
font_01_sfnt_off0000d9d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D4 20756 bytes
SHA-256: 1e64d4c9d2ad4fdb4002bc4556123b83fa465f407188ba713babfe713ef257a8
font_02_sfnt_off000110c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1