Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3b6be4c8a0b828e…

MALICIOUS

PDF

81.0 KB Created: 2021-09-12 17:46:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c94fbabf675eac14b70f61a0fd71584c SHA-1: 2a5945d94825ae114d174ba70c8d9360017884ef SHA-256: c3b6be4c8a0b828eba2833897038dde3be9cece84c674c4ac09f79ec88daa686
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or are hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the presence of numerous external links and the nature of the heuristic firings strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://nessium.fr/userfiles/file/47348600644.pdf In PDF document text
    • http://rapet.hu/files/kekujexetukaj.pdfIn PDF document text
    • http://remaining-mc.de/userfiles/file/21199627775.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161351305cc7c7---kuvekumivagunavotigaz.pdfIn PDF document text
    • http://proclima-membranes.ru/userfiles/file/xezirilipulonewegariko.pdfIn PDF document text
    • http://xaydunglenguyen.vn/upload/files/9307cd.pdfIn PDF document text
    • https://rakowka.pl/userfiles/file/55778337908.pdfIn PDF document text
    • http://candientushinko.com/images/file/zegunojowixe.pdfIn PDF document text
    • http://trufeel.com/ckeditor/ckfinder/uploadfile/files/39289363429.pdfIn PDF document text
    • http://psychologkmalinowska.pl/ckfinder/userfiles/files/53280596017.pdfIn PDF document text
    • http://fzcce.com/aimgs/uload/files/58613710807.pdfIn PDF document text
    • https://mirrorlink.com/public/files/files/15148920502.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b2c428c365---65937224124.pdfIn PDF document text
    • http://usarsenal.it/userfiles/files/dinumuwitozusiz.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16138875bcf0f0---maguxusirozogoxibejamas.pdfIn PDF document text
    • http://stelmart.ru/userfiles/file/55192759241.pdfIn PDF document text
    • https://jagamimpi.com/contents/files/24295980819.pdfIn PDF document text
    • http://corising.info/sa_upload/userfiles/file/20210902040611.pdfIn PDF document text
    • http://trans-serwis.com/userfiles/file/fuzezuxewalekuv.pdfIn PDF document text
    • http://babyindex.nl/images/uploads/bowileduzesojovirusosokax.pdfIn PDF document text
    • https://thietbigas.net/media/files/jekeginavidal.pdfIn PDF document text
    • https://motoquadro.de/userfiles/file/57556905881.pdfIn PDF document text
    • https://dcimx.com/files/sisafi.pdfIn PDF document text
    • http://greentreeprep.com/cote_dor_import/admin/ckfinder/userfiles/files/89659325630.pdfIn PDF document text
    • https://zniczekowalczyk.com/user_images/file/fevurositebobokojigo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=watch+my+hero+academia+english+dub+online+freePDF 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_off0000d9e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F4 16384 bytes
SHA-256: 7ebd2d93f5bb4424c602ca5a88cda2682815738808421c8f4a74a5765fa5ed4d
font_02_sfnt_off00011c12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C12 11268 bytes
SHA-256: 51e306294a4d2bd51c66f6ec57c22b444f1cf53d49fd76176b783de8c14d31cc

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