Malicious PDF — malware analysis report

Static analysis result for SHA-256 624a660ee897de1b…

MALICIOUS

PDF

76.4 KB Created: 2021-09-14 02:02:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 42c290d0db179464c446b5be95f057ba SHA-1: 906c7ca16d356f01bb29ee97abc625d4ffaf9e07 SHA-256: 624a660ee897de1b79bd9c237cee303fbe5673a6c572069eb540905144449af8
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary attack pattern involves luring users to these compromised sites, likely to serve further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

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://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/1ulv90hbgoc8dtc4s82pvd4046/67869178588.pdf In PDF document text
    • http://zwickerfoto.hu/_user/file/69922389385.pdfIn PDF document text
    • https://vinocastillo.hu/editor_up/93681540894.pdfIn PDF document text
    • http://artwatch.ru/userfiles/file/xasimaxurofawizojivize.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/64cc9c47e1edca3585743a97504c7ed5/fapovujetaz.pdfIn PDF document text
    • http://codienlanhminhquang.com/upload/files/waredekiki.pdfIn PDF document text
    • http://splogservice.ru/content/files/tefapazinapajetazunum.pdfIn PDF document text
    • http://justsayhi365.com/uploads/file/57675950385.pdfIn PDF document text
    • https://xn--nmqu14inmf.com/upload/files/96856193722.pdfIn PDF document text
    • https://shoppingplanet.cityplanet.ro/ckfinder/userfiles/files/xugebirotabor.pdfIn PDF document text
    • http://candemdientu.com/Images_upload/files/tojawopuvepuwakasivunewu.pdfIn PDF document text
    • http://cortabellanews.com/userimages/58927679747.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ec317de50e---73080657816.pdfIn PDF document text
    • http://tokyosushilohaus.com/uploads/files/rexojexagosigojofa.pdfIn PDF document text
    • http://agisinfo.ru/uploads/content/files/37915840489.pdfIn PDF document text
    • http://odontotecnicacoop.it/userfiles/file/pifupajegidiporufuno.pdfIn PDF document text
    • https://laughteronlineuniversity.com/images/upload/files/fodopodefezilegewi.pdfIn PDF document text
    • http://sunway.me/uploads/file/110721305656.pdfIn PDF document text
    • https://mystruggle.uk/indigo/ckfinder/userfiles/files/57752433471.pdfIn PDF document text
    • http://sochi-riba.ru/ckfinder/userfiles/files/ratizawejixugiwumeziwav.pdfIn PDF document text
    • http://kwong-cheong.com/userfiles/ligisonag.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/1973069c90165fa2fd4c3be557745e52/66653865581.pdfIn PDF document text
    • http://exim5.hu/_user/file/nedixonitawesugidaxa.pdfIn PDF document text
    • https://bio-obst-und-gemuese.de/userfiles/file/29019855506.pdfIn PDF document text
    • http://flcevent.fcu.edu.tw/plugin/ce1/ckfinder/userfiles/files/20210914001015.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1613cd7c4f0dd4---65249752573.pdfIn PDF document text
    • https://santevita-bg.com/ckfinder/userfiles/files/6618845956.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=glitch+pokemon+go+2021PDF 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_off0000c48f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC48F 17872 bytes
SHA-256: e0e484bca0fad735f90466d5a0adc82bff4e722170ebca149396ac52e58b7ac3
font_01_sfnt_off0000f28f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF28F 10816 bytes
SHA-256: 3354cb595ba5187ffd776402e5d71332a3325a79a07c3eceae74621bd4fdfa2d
font_02_sfnt_off00010b60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B60 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1