Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fb729165b7c33a6…

MALICIOUS

PDF

83.9 KB Created: 2021-09-16 21:53:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e537db137050e9b4d22c73d5570bb2fe SHA-1: 3f3e57cb7e72de09d6890b20c5df8f030a4f3b3f SHA-256: 1fb729165b7c33a63815ea1fabebf80f6e341413691a77d0ce61df1a86aebf62
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, characteristic of a link farm used for phishing or malware distribution. The presence of external URIs and the overall structure suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://laborke.ru/uplcv?utm_term=tenses+worksheet+for+class+6 PDF link annotation
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/ece99589974e8ee7149806ff8fc5bf05/dizafafefazib.pdfIn PDF document text
    • https://banderlogclub.ru/Files/file/wizubijemakewalagikutulut.pdfIn PDF document text
    • http://geerhannutpourreussir.be/docs/upload/files/fedelimebuw.pdfIn PDF document text
    • https://specializedfacilitymgt.com/public_html/userfiles/file/xufidawufonamosaxalitiw.pdfIn PDF document text
    • http://hooleihomes.com/cms_images/file/82383815982.pdfIn PDF document text
    • http://paitoonbox.com/userfiles/files/vibutipisilusilufi.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16141de647ee29---39009889958.pdfIn PDF document text
    • http://risorsaterra.it/userfiles/files/32545738538.pdfIn PDF document text
    • http://kuppersbusch.hu/userfiles/files/87594627316.pdfIn PDF document text
    • http://telegid.tv/userfiles/files/lazegupiperutovod.pdfIn PDF document text
    • https://mobisteelegypt.net/userfiles/file/62137936180.pdfIn PDF document text
    • https://www.hasmow.com.au/application/third_party/ckfinder/userfiles/files/dozepewafanumikakugujigez.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/t3d4817l9g2u60tk3hvc92qcvq/zitamodoboxa.pdfIn PDF document text
    • http://terhautz.com/upload_files/files/714089601.pdfIn PDF document text
    • http://clubselectionvoyages.net/images/file/1004255191.pdfIn PDF document text
    • https://jetaime-shop.dvsportbg.com/files/zanizik.pdfIn PDF document text
    • http://rurisnet.org/images/file/tikuwofatubitubanilaxibar.pdfIn PDF document text
    • https://stonebuild.bg/f/uploads/files/susixogomonotiputolakaja.pdfIn PDF document text
    • https://comfort8889.com/upload/files/divorirudewotufuv.pdfIn PDF document text
    • http://phuocthuan.vn/images/pic/file/73081562359.pdfIn PDF document text
    • http://www.ezmoving.com/file/38655537087.pdfIn PDF document text
    • https://fier-forjat-valimet.ro/ckfinder/userfiles/files/jolawerud.pdfIn PDF document text
    • 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_off0000e0d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8EB 18536 bytes
SHA-256: 1534fd40f6a6531b6b088f2db90696c4a6ccaad7d7b93a3773b627ce0f4b79fd
font_02_sfnt_off000129b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129B3 10648 bytes
SHA-256: 4eddb5857553cc72e5ab01f4c210a45a9bf5ec82c26972b61405ef8483a73977