Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a435d1c138eef19…

MALICIOUS

PDF

78.0 KB Created: 2021-08-16 20:14:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f1b6352b849cabea8c307752204a43af SHA-1: 0fa6fb95a6fd3e3ed7beda4a5efe79eac0c18db6 SHA-256: 6a435d1c138eef197a2514867bcc89cc8b1f2d89b9ee5a7d2c4fbb30b5286b15
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting. The primary purpose seems to be directing users to malicious content or phishing sites, likely as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://oniceh.ru/uplcv?utm_term=bedava+arabesk+damar+sarkilar+indir PDF link annotation
    • http://stroi-sistema.ru/img/gunirezopezituv.pdfIn PDF document text
    • http://weddingdiy.cc/uploadfiles/files/20210702_055302_4010.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/dlt2v6rr1smpr24tqqh9ujfs7u/lutufinuvodegifufojag.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af91eca95ef---webaleribukovozexi.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/t1mbmmfi5oav0oim844upk16sg/wabonaloxikojotekiko.pdfIn PDF document text
    • http://gilbertthomasreunion.com/clients/5/5f/5f56fe696be94dde62972871c8a9bc28/File/91889865374.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/7fa8535df4c6a8f570c53817d65fc7cf/27408568134.pdfIn PDF document text
    • http://terminsk.by/pics/files/71133829848.pdfIn PDF document text
    • http://clairvoyantinfotech.com/demo/images/xipifomulex.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/47353fe312835d72534dd670f12f39ba/zutelozurokug.pdfIn PDF document text
    • http://iweldbot.com/ckfinder/pho/files/kaxuzivugimumudakipomete.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160942541a075c---wufuweduwovakejodeb.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/d2cb8a667051f4ed9d58003869229848/33387007117.pdfIn PDF document text
    • https://jairdefreitas.com/ckfinder/userfiles/files/xajenofubudi.pdfIn PDF document text
    • http://ilink.pl/userfiles/file/subadetogujiv.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/16081d962542c2---56293107184.pdfIn PDF document text
    • http://ysmenmidwestindia.org/uploads/userfiles/file/file/19238296470.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be387c29c6c---masobuliziwawepu.pdfIn PDF document text
    • http://tcmoving4cure.com/clients/a/a2/a295acc0500fd37d831de80ba00a7552/File/tubix.pdfIn PDF document text
    • https://leise.ru/admin/ckfinder/userfiles/files/60553292006.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608b0f52995f8---dawakifatodasowa.pdfIn PDF document text
    • https://binarbaidequipment.com/public_html/userfiles/file/21842194222.pdfIn PDF document text
    • http://akademibt.com/resimler/files/22220177274.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/hhe2udr6likt2gbqk81v2jgoha/jepomejisu.pdfIn PDF document text
    • https://www.weldcor.ca/public/ckfinder/userfiles/files/jotenilijuwujen.pdfIn PDF document text
    • http://gndpta.eu/news_objects/files/45903768392.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e138b925d44---wozinil.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_off0000cc26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC26 10540 bytes
SHA-256: 3c6f99d2c495fa3e480be2e65ec2728a8fabe89e555f33cbbedbc6bc23426497
font_01_sfnt_off0000e420.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE420 17740 bytes
SHA-256: b88751dded6d86388f990589c474fe714f9d0801b80d8e83d8600defeeaf2208
font_02_sfnt_off00010ff1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FF1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1