Malicious PDF — malware analysis report

Static analysis result for SHA-256 052bac20257a2528…

MALICIOUS

PDF

73.7 KB Created: 2021-10-08 20:20:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: a5f6f5dea376976c43ed9bdcb3069ad4 SHA-1: aa6487d2e8969ef59b8e15f4ff9b0d797c37de67 SHA-256: 052bac20257a2528b4e3371991b60efda3261efb59ac19a52bc3e28ff2249517
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting. Heuristics indicate this is a link farm designed to direct users to external sites, consistent with phishing or malware distribution tactics. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://pistant.ru/uplcv?utm_term=crying+face+text+symbol PDF link annotation
    • http://gpe-el.pro/ckfinder/userfiles/files/58059997839.pdfIn PDF document text
    • http://tt-ural.su/admin/ckfinder/userfiles/files/jotazazim.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/r5qrn371vrpiuf1uqa7k40jq71/fumiv.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613b08d9e1bf4---jofagutiladifaxad.pdfIn PDF document text
    • http://dienlanhtruongson.com/upload/files/puvijavufuzetojafixaj.pdfIn PDF document text
    • https://gsacademy.ge/uploads/files/mikalane.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/16158c8443970d---giwekafotaruzobotez.pdfIn PDF document text
    • http://sumosushingrill.com/uploads/files/45891860720.pdfIn PDF document text
    • http://fskyok.com/uploadfile/files/wiviruzojolozub.pdfIn PDF document text
    • http://tatvideo.ru/ckfinder/userfiles/files/77002022974.pdfIn PDF document text
    • http://elfobchod.cz/foto/Image/file/46167771999.pdfIn PDF document text
    • http://lasantitosrestaurant.com/userfiles/file/xojepokafu.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/62713412478.pdfIn PDF document text
    • http://vimar.ua/userfiles/files/mugusavibope.pdfIn PDF document text
    • http://bestorkate.com/uploads/ckeditor/files/gowelimufufojetomamolodo.pdfIn PDF document text
    • https://ww170001.linebot.net/upfile/files/20211002230124.pdfIn PDF document text
    • http://tichdiem.surecare.vn/uploads/userfiles/file/14003011855.pdfIn PDF document text
    • https://gs-hemeringen.de/ablage/userfiles/files/fogovilusopili.pdfIn PDF document text
    • https://pesonabali.dswip.com/ci/userfiles/files/vabekuxoneludot.pdfIn PDF document text
    • http://schoonhovensvrouwenkoor.nl/ckfinder/userfiles/files/75669089806.pdfIn PDF document text
    • https://pointwebhost.com/calisma2/files/uploads/68717439787.pdfIn PDF document text
    • https://aymsoft.us/aym_image/files/nadodan.pdfIn PDF document text
    • https://inijariku.ugdherbal.com/ckfinder/userfiles/files/60289670290.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613c7b5d6c167---xibexixitotawodi.pdfIn PDF document text
    • https://m3nan973ru5-pa571.com/contents/files/67027647890.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_off0000b71e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB71E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF30 18624 bytes
SHA-256: 4db1dddce09a64db36755592fa48df440a4719877d3bb66d178a10fa4b47a839
font_02_sfnt_off0000ff5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF5E 11064 bytes
SHA-256: 82591678c202f92967ea68fbc8e4b8209dc82df5e1829ea7f6d7acee74749ceb

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