Malicious PDF — malware analysis report

Static analysis result for SHA-256 335bb78a892d08ea…

MALICIOUS

PDF

80.4 KB Created: 2021-07-22 05:37:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ec23b0c134764a8c2541e9e68d153490 SHA-1: dac1e51a11f41d3dc68dc5f841dbbfd38b687729 SHA-256: 335bb78a892d08ea5559edd8111ba7cad16105dc036fac7661d937ad726aa2bf
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable hosting. These links likely serve as redirects to phishing pages or malware download sites. No scripts were extracted, but the structure and URL analysis strongly suggest a malicious intent to lure users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/6124965c7520b149c792c2aa0c905cbf/55087692923.pdf In PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/e15c8d9ef1b12682abfc9ada346ee7e1/44669490657.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/gs675tnlaojmcmco038lmre0i0/poduvewokusegosurezovene.pdfIn PDF document text
    • https://www.nickelmarket.co.za/includes/ckfinder/userfiles/files/25624140282.pdfIn PDF document text
    • http://chayka-svg.ru/files/1467057420.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/ff091074b36b454566cd88af76a7dbb2/88061797223.pdfIn PDF document text
    • https://altinhediyeler.com/calisma2/files/uploads/mafabejisuvasi.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/3d0ef9e5d2f9ffe4c60f12ded01aa842/48824459286.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16095e6069817a---67954684435.pdfIn PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/a99042625c49a61c74765f12326b596e/38869568999.pdfIn PDF document text
    • http://nousgarage.com/userfiles/file/70660358905.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/3cb9bd3b67b98773a59c5b41b0105737/30070555841.pdfIn PDF document text
    • http://ccforum.kr/uploads/file/1621447705.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/vvs1urakkjlckr8v5kki331hrn/xidubonefefoxuzolimiwogak.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/0046b6fd42b5b176d2253d35d6fd0c9e/xosafilipagolebikuzad.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160763f5ed0c03---leketifevedafedofokofef.pdfIn PDF document text
    • http://urbancollab.com/userfiles/Proj_Name//files/zodiwenif.pdfIn PDF document text
    • https://hashtag.school/userfiles/file/rerepuku.pdfIn PDF document text
    • http://bangkoksolarpower.com/syner_upload/images/files/49912413983.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/52279005838.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-4/20210504171249194608.pdfIn PDF document text
    • http://dhf-china.com/d/files/parogeji.pdfIn PDF document text
    • https://mysmartedu.com/uploadimages/files/80561254979.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=mvc+java+interview+questionsPDF 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_off0000d695.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD695 10696 bytes
SHA-256: b675eb9cd9668b6b73a4070ee4f45f7c27902459d7bbc2e07eaeb8136cd59859
font_01_sfnt_off0000ef56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF56 16684 bytes
SHA-256: d7c9972f4303ab17d9c6c0203f65573363dde1b317dc2f6c8e665291c390b583
font_02_sfnt_off00011abc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ABC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.