Malicious PDF — malware analysis report

Static analysis result for SHA-256 e11fb4fd7aa97bd3…

MALICIOUS

PDF

68.9 KB Created: 2021-09-25 23:58:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 926014f267d658bdfe903e2aa786a8ed SHA-1: 5c7e1bc4175b3213d70e2aedb718551768b5dc65 SHA-256: e11fb4fd7aa97bd3efe67000a8fcf55f4f5dff0f684e1a39521b795f050f2932
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF is identified as malicious by ClamAV and a machine learning classifier. It functions as a link farm, directing users to various external URLs, some of which are hosted on compromised WordPress sites. The document's structure suggests it's an image-only lure designed to trick users into clicking these links, likely leading to further malicious content or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 2 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://wastran.ru/uplcv?utm_term=remote+android_7+1+apk PDF link annotation
    • https://ibeguiristain.com/userfiles/files/kiwapidedufodas.pdfIn PDF document text
    • http://studiotecnicofrisoli.com/userfiles/files/fodoze.pdfIn PDF document text
    • http://karinameal.com/imgdish/files/63661582118.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614dcc76b80ab---91190749968.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/2b7e2bac2b3e5c1c8217e99d9d0b0b87/29035399732.pdfIn PDF document text
    • https://mut-zur-veraenderung-hambuch.de/userfiles/file/24371932682.pdfIn PDF document text
    • http://patp1ryb.ru/media/file/filerupirepaxomag.pdfIn PDF document text
    • http://colorfusion.us/admin/images/file/40327535433.pdfIn PDF document text
    • https://mygoaltv.org/ipp/images/uploads/files/pifagezitigedafila.pdfIn PDF document text
    • http://capital96.com/userfiles/file/39143361895.pdfIn PDF document text
    • http://hyundaidongdo3s.com/images/files/13274908154.pdfIn PDF document text
    • http://csc020.com/userfiles/file/20210920172525_me1jc6.pdfIn PDF document text
    • http://zehanbiopharma.com/upload/files/54490110634.pdfIn PDF document text
    • http://all4pets.cz/ckfinder/userfiles/files/molopebir.pdfIn PDF document text
    • https://ssvacancy.com/ckfinder/userfiles/files/11356701744.pdfIn PDF document text
    • https://www.puskinas.lt/ckfinder/userfiles/files/51939470987.pdfIn PDF document text
    • http://www.andreapondika.cz/file/66132944105.pdfIn PDF document text
    • http://acutecardio.ru/sadm_files/82121024811.pdfIn PDF document text
    • https://martas.vodrsport.cz/uploads/files/govodarosijariluzo.pdfIn PDF document text
    • https://impulsa.mantareys.net/uploads/plantillas/files/52851668618.pdfIn PDF document text
    • http://el-system.jp/uploads/2012/files/vafomubex.pdfIn PDF document text
    • https://8foro.exceltur.org/exceltur_nuevo/ckfinder/userfiles/files/bojuvisojo.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/113aa488939281350d0fa0ef20c3031a/wibareg.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1613378ac59c20---vozikubipora.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_off0000b174.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB174 10608 bytes
SHA-256: b559f626d19cb55f63d02760c5aa39a090720985b8849c940ebe2596d4718445
font_01_sfnt_off0000c9c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9C5 14332 bytes
SHA-256: 17820070d564dc64e09c53d9476152bbd6b8d737e4d7c181f88d48b114fdd969
font_02_sfnt_off0000ede2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1