Malicious PDF — malware analysis report

Static analysis result for SHA-256 7609a5e1c3e7b63a…

MALICIOUS

PDF

98.9 KB Created: 2021-08-15 09:09:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 9099032efd41c68c6a7514550fec45e3 SHA-1: 433a7b240af4777a2e704f3ea461357ba41d0e13 SHA-256: 7609a5e1c3e7b63a53a167a4d3f8064beff36562683ef1cd08bf75553ef9631d
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating it's likely a phishing or trojan delivery mechanism. It functions as a link farm, containing numerous URLs that point to other PDF files hosted on compromised WordPress sites, suggesting a multi-stage attack. The primary purpose appears to be directing users to malicious content through a series of redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9600

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://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/m6de5800mao35ohi1kcom37e04/bivada.pdf In PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/gft2jq8uego0ap7588ntsadu97/tifubarumup.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/c9595c68a2520aa1416848e176761dea/9040326650.pdfIn PDF document text
    • https://geya99.com/ckfinder/userfiles/files/7287139741.pdfIn PDF document text
    • http://csc-0898.com/userfiles/file/20210708052407_yo9a0d.pdfIn PDF document text
    • http://rogo-rotterdam.nl/files/xevarare.pdfIn PDF document text
    • https://norservis.com/files/files/25312577866.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/bejojilijubofe.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/d9fae685307a2fab848ccf5b9dfbd99d/41689009028.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076c09c182c7---94951759234.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/5suv275e8qk7r8ji622vf8tin3/pudes.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/19101846827.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/zexobenop.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3dcb19ce3f---magivipa.pdfIn PDF document text
    • http://cheumst.com/upload/fckeditor/file/soburewewaxixitefoju.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072e893417bf---9171739433.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/9898ad998ee39efef20989971ed334a3/fesefemekoxetib.pdfIn PDF document text
    • http://guowangcable.com/d/files/pasezixaberonu.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160e41b44d3720---87626121949.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1606d05d3461d3---30562724923.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/t46g9rf6b2eth01klmkooahfd0/50206371250.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608c663916a57---fotadima.pdfIn PDF document text
    • http://dainichiji.com/upload_ckr/files/jubasuladeli.pdfIn PDF document text
    • http://westleyden72reunion.com/clients/4/46/469dc9162705cbff2d1fbe132f144f37/File/jipisegof.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160949785b42fb---veraron.pdfIn PDF document text
    • https://eventaipei.com/upload/files/4701390370.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=blink+xt2+owners+manual+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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00012592.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x12592 17156 bytes
SHA-256: af993927d9dcf27d4e079720ad3488bd589e27a3d765cfdc54dc3ce20ab1534a
font_00_sfnt_off0000e4f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F0 24024 bytes
SHA-256: 5211d84bd0fa217c0f76593a94c5b7a9e1cdb044ba7985bcb67104455116e5e7
font_02_sfnt_off00013f2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F2A 2620 bytes
SHA-256: 57c6be3e64e614338ef3a94772903960e1bdc48696befdc178124c2511d9daea
font_03_sfnt_off00014a34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A34 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off0001624b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1624B 11212 bytes
SHA-256: 3fb2ed6b0935370481b500a20e3c3c25979b56c25fb6991ce84a8abbaf66a74c