Malicious PDF — malware analysis report

Static analysis result for SHA-256 882509c6c77c5a43…

MALICIOUS

PDF

96.7 KB Created: 2021-07-17 20:32:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 961f40f993c4e8f37acff538b940a468 SHA-1: efcefa6ee8e32871d1da68456d3f54818e632128 SHA-256: 882509c6c77c5a434ad6587a3b73da13beb70ebf19aad2914b5fcacb6638c2ee
156 Risk Score

Malware Insights

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

The PDF file contains numerous links pointing to websites hosted on compromised CMS platforms, indicating it functions as a link farm. The presence of multiple distinct hosts and the use of 'utm_term' parameters suggest an attempt to lure users to potentially malicious content. ClamAV detection and ML classification confirm its malicious nature, likely for phishing or malware distribution.

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 http://ylpcl.com/ckfinder/userfiles/files/monisupuzi.pdf In PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087a4f5a7455---88379031691.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/etg8k6rsarmcrt6873ljju7i66/42173306816.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160b4ab610353e---votidelim.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d23544b038a---tuvamapesogotuko.pdfIn PDF document text
    • http://cedarvalekansas.com/clients/875954/File/51682351750.pdfIn PDF document text
    • http://radio-salsa.com/php/rs/filesupload/file/18134264150.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edec679187f---lusegulufo.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/tqnd9aus6d7nfv3ldoqiq2a463/20176210373.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607f4d4d91440---pavoxukura.pdfIn PDF document text
    • http://thallo-food.hu/uploads/ckfinder/userfiles/files/50009810893.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/2383c4a2555955c13d3c91682a3fba14/32778458889.pdfIn PDF document text
    • http://rjt1.org/upload/files/24185826163.pdfIn PDF document text
    • http://applecentervn.com/uploads/image/files/24795630510.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/8a5c8fbd0d1b83d4140b0b91df40b6cf/bipuvufaperapaf.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/16098acfca076e---27945410219.pdfIn PDF document text
    • http://big-blue-bus.com/pics/fotos/1/file/17729055911.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/8c7b3ce64fdcf77074b89ed6825d5fcf/15087000908.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/95071383abfe7dd04b1ef5cf7d6f35d5/bulusu.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/60d90de2f495f8f2ccfefa093758423f/furebok.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a7703912f0---13908392168.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/dddab81dsri8qt9i7v22ob3bjc/tamamiripomazovipesejudo.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bc1f2640de3---31205714651.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=foster+jenkins+florencePDF 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_off000118aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118AA 10364 bytes
SHA-256: f78ca2c480d9bd819418cd7b0b48ca8a42d24aa57a3f42eaaaec6a83bf21ad4f
font_01_sfnt_off00013025.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13025 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014837.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14837 17576 bytes
SHA-256: 717d4615a0f1fc8b0e930fede6dd017095834ec854a7d657d1b6b4476bb11de6

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