Malicious PDF — malware analysis report

Static analysis result for SHA-256 efb400e29940a473…

MALICIOUS

PDF

86.0 KB Created: 2021-09-10 04:18:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f41e1a7dbe71dffc9ac5f47b12ea7787 SHA-1: 547c860a1e8ce833453611aedc95e4ebbd510626 SHA-256: efb400e29940a4737eed93d40d13ff27b0b0a51777723678bfbc4109368567c4
156 Risk Score

Malware Insights

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

The PDF was flagged by a ML classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The `utm_term` parameter in one URL indicates a potential phishing lure related to access point settings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://coretry.ru/uplcv?utm_term=access+point+name+settings+not+available+for+this+user PDF link annotation
    • http://softwaretesting.kr/club/data/userfiles/file/20210905034958.pdfIn PDF document text
    • http://sitarofindiamd.com/userfiles/file/45476262952.pdfIn PDF document text
    • http://modelseafarm.com/kweb/ckfinder/userfiles/files/76307093246.pdfIn PDF document text
    • https://nocnepal.org.np/ckfinder/userfiles/files/guzafuzupuvuxewo.pdfIn PDF document text
    • http://masan315.net/board/imagefile/file/wadoretabazawifeganazo.pdfIn PDF document text
    • http://geerhannutpourreussir.be/docs/upload/files/51414228213.pdfIn PDF document text
    • http://stellarp.com/userfiles/files/rijevovapun.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/5672f8532397eecb05ce3c812dc28997/39699385054.pdfIn PDF document text
    • http://pcserviszlin.cz/ckfinder/userfiles/files/gedowomosavafizi.pdfIn PDF document text
    • https://cqc-material.com/app/webroot/userfiles/files/dapoxojamatetexodowo.pdfIn PDF document text
    • http://cyklo-sport-servis.cz/UserFiles/File/bikekukagisitubaliz.pdfIn PDF document text
    • https://manage4.realtourvision.com/rtv/ckfinder/userfiles/images/files/jodosupikewemaxujawepajig.pdfIn PDF document text
    • http://malovanesklomh.cz/images/file/71512710092.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16139b86442040---lerixeru.pdfIn PDF document text
    • https://jairdefreitas.com/ckfinder/userfiles/files/worikexoto.pdfIn PDF document text
    • https://tennis94.fr/img/pics/files/26760205297.pdfIn PDF document text
    • https://chiuman-hk.com/images/file/82679328709.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/19369713312.pdfIn PDF document text
    • http://karaokejdi.com/ckfinder/core/connector/php/upload/files/83062745764.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/10c08ca254031accbed90bc58fdf2071/mugegusedewuridugemu.pdfIn PDF document text
    • http://aallergy.friend-match.com/upload/files/posemifazipupipituxokof.pdfIn PDF document text
    • http://humidorio.de/ckfinder/userfiles/files/91779514997.pdfIn PDF document text
    • https://homestayhoian.thamtuddt.com/uploads/image/files/10865950741.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_off0000e984.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE984 11212 bytes
SHA-256: 2e7acb23460c7c0c5dc1561b33f244a6dcfe5ee2af6f902ab75c66386cb1dd72
font_01_sfnt_off00010365.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10365 17824 bytes
SHA-256: 90efe2cf2194ff68af39fc25454b849398be5f0eddc12148d2e91d570a8e42df
font_02_sfnt_off00013198.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13198 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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