Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6f1cefda6c39839…

MALICIOUS

PDF

89.0 KB Created: 2021-07-06 03:10:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: eed184f0c38f336135fd99c60937f6c8 SHA-1: 202aa1b1b3e05068fe42ee7f8f82a19c369eabb3 SHA-256: b6f1cefda6c39839c3f203ee16240247e7a5e7c8eb4fd79f6695002a2a71e0d1
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as a link farm, with several URLs pointing to compromised WordPress upload directories. The ML classifier and ClamAV also strongly indicated maliciousness. The file likely serves as a lure to direct users to malicious content hosted on these compromised sites, potentially leading to further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/1a30e897951660052ce2143ededf2c60/47577332975.pdf In PDF document text
    • http://internationalnetworksolutions.net/files/In PDF document text
    • http://thegreenlegacykeepers.com/clients/e/e8/e8dc17949b7ef813e9937e453902477f/File/57209883527.pdfIn PDF document text
    • https://edarky.net/data/file/72262504014.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/5u124pk2vnsmrc7v2dhjb94tum/nitapo.pdfIn PDF document text
    • http://global-leasing-management.com/uf/file/biruxefakofazowimapo.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/2kobae620ua9h59gi5klca4ft4/fovudotigikojizo.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/21b4ec0aa0f587cf01b11483b3c556f6/85885150530.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/16077e716b558d---31460151323.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b843b832c6c---putigudajena.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e925cc67c2---82453793032.pdfIn PDF document text
    • https://vieiras.pt/imagensprodutos/file/reluvimef.pdfIn PDF document text
    • https://samarpanbharat.org/trila/userfiles/file/18850726119.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bb4e3b1d928---fifinilasofot.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/34207b3629a258ac30a57fa73d72fe9b/209767755.pdfIn PDF document text
    • http://indovinandoilmondo.it/themes/userfiles//files/72971863988.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/6cfadbb18ad77d4e81de2bec6caada2d/jivugaro.pdfIn PDF document text
    • https://peilimineko.com/userfiles/file/42268155264.pdfIn PDF document text
    • http://maskaevlawyer.ru/userfiles/file/pujizuloxazopaxupebusub.pdfIn PDF document text
    • https://securitydm.rs/slicice/file/kemakoru.pdfIn PDF document text
    • https://aymsoft.us/aym_image/files/lugokanogalivubejo.pdfIn PDF document text
    • http://phukhoabacninh.com/images/files/36273918690.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/emidq4ugbfr4ctn1or63c7bua8/82112628742.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/nvghc44tlkuhvobf81rlsl5b25/kisuremoruva.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/8f5571hao9clhsh4bfg8jc4093/65618325852.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=meaning+of+rest+and+sleepPDF 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_off0000faba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFABA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000112d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112D1 10668 bytes
SHA-256: a2e5a0909f0f238b3ff318b3428832c51af511c39ac7ab91be1dbe38278aca39
font_02_sfnt_off00012b24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B24 16904 bytes
SHA-256: 9337b265392fa6dc463d87cae263ad8686788d84aed69d216fc78db1cd7a064b