Malicious PDF — malware analysis report

Static analysis result for SHA-256 aec3c7625c27b6aa…

MALICIOUS

PDF

85.7 KB Created: 2021-09-05 02:45:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 73dba2a171981296075451efaa7ed697 SHA-1: 4f8a40ebc1196427e733a780f3be11d1499f2e39 SHA-256: aec3c7625c27b6aa2da401175797ca37d11e1477fe48190aa61db20d7127513f
156 Risk Score

Malware Insights

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

The 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 uploads or disposable hosting, suggesting a link farm intended to lure users to malicious content. The presence of these links and the overall detection profile strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://aow.infogestnet.it/ckfinder/userfiles/files/ketoje.pdf In PDF document text
    • http://adamlegal.com/userfiles/file/subakemak.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/83683333496.pdfIn PDF document text
    • http://saeronbio.com/userData/board/file/nugamuxe.pdfIn PDF document text
    • http://interwork.sk/userfiles/file/wifuwul.pdfIn PDF document text
    • https://matrainagycsalados.hu/userfiles/file/53585021412.pdfIn PDF document text
    • http://fujiya-la.com/uploads/files/demamagaravomijujuzokenat.pdfIn PDF document text
    • https://bloomeng.com/uploads/29489733929.pdfIn PDF document text
    • https://nedimgame.com/calisma2/files/uploads/pizuvikutinaguma.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16082591175fef---16649549666.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/161120f64374d4---12625171386.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/30007ccec486c26b69168d9e3ce97f9d/5453046292.pdfIn PDF document text
    • https://bloomland.com/sites/bloomland.com/files/metezozujuroxaxosojugaxo.pdfIn PDF document text
    • http://americanewbie.com/userfiles/file/67404326580.pdfIn PDF document text
    • http://skiflogistics.ru/userfiles/file/84360564569.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/f9f3fcf7d2e359b7c8a723f8ac12b5b9/82917616778.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/86f5649b51c5107f25c58f87b3fef70f/vuxalozutepumazetiv.pdfIn PDF document text
    • http://mobiliteit.nu/files/xojokejibakulo.pdfIn PDF document text
    • https://snoman.mb.ca/ckfinder/userfiles/files/72203826475.pdfIn PDF document text
    • http://ordinate-ltd.com/file_media/file_image/file/xabukamarogeselenu.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8369ae9ec4---79559710153.pdfIn PDF document text
    • http://thienthaopc.com/upload/FCK/file/kidoxejobamokigemejisiguz.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160dfc1ea44ebc---49404640956.pdfIn PDF document text
    • https://adian.eus/files/galeria/files/37978306025.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f53dcc36f6---jigowupixulibu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=cbse+class+12+maths+question+paper+2015+pdfPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB6 11728 bytes
SHA-256: d402831d2522af15bd463bf044ccbd631c5daec3e4f472c928d68aab3dcc686d
font_01_sfnt_off0000fb2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001133f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1133F 20356 bytes
SHA-256: 06b35b796b138362c5dfa5323799b0d24d33593cf7d6d1ec4dd600fe49152fda

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