Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad537bccea9b6673…

MALICIOUS

PDF

80.9 KB Created: 2021-09-07 06:53:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3b1170a2a45a7db33795866b26a9cf83 SHA-1: 9349d76116350137f0a0e105696376a6f3004222 SHA-256: ad537bccea9b66737a34f45edc2352e6bf38394af94fe3c31219fb34fd165c1b
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606f215378eda---88746439315.pdf In PDF document text
    • http://renovfab-menuiserie.com/userfiles/file/68722415047.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160bd37f1f01d0---sewevadiminamexodu.pdfIn PDF document text
    • http://globalroomplus.com/bot/ckfinder/uf/files/jegadigewadufovubaka.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/74c78f5ad003c0006ffc8ba63c66165c/namej.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612387dc8661a---37455941510.pdfIn PDF document text
    • https://advik.net/userfiles/file/10846787369.pdfIn PDF document text
    • http://romengo.com/ckfinder/userfiles/files/xivetaxumekuxil.pdfIn PDF document text
    • https://elesud.it/img_pagine/file/gojuketijizosazirositix.pdfIn PDF document text
    • http://casaperferiesantamariagoretti.com/writable/public/userfiles/file/56809979196.pdfIn PDF document text
    • https://techson-cctv.com/upload/file/rakulamugujugigipuxuset.pdfIn PDF document text
    • http://daehwa.info/uploaded/file/bajipetofunilevogimaledil.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/36119010843.pdfIn PDF document text
    • https://naucharts.com/ckfinder/userfiles/files/40974182404.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/d3n0o5qd97n5alef1go2egsao4/41740406974.pdfIn PDF document text
    • https://stgeorgedentalcare.in/ckfinder/userfiles/files/niwibum.pdfIn PDF document text
    • http://fitviewer.com/files/file/ralavukefoxasoxokewitu.pdfIn PDF document text
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076bd404551d---dikijunida.pdfIn PDF document text
    • https://mcq-exambd.com/app/webroot/ckfinder/userfiles/files/xinokabinivim.pdfIn PDF document text
    • https://aurorabersinar2.com/contents//files/tixotefafexaji.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c27585b026a---beramatujuzebunax.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/palubinugal.pdfIn PDF document text
    • http://dichvubaove.online/upload/files/83548476174.pdfIn PDF document text
    • https://quimicasorocolor.com.ve/ckfinder/userfiles/files/90270052472.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=drenagem+linf%C3%A1tica+manual+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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d385.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD385 18772 bytes
SHA-256: caf878e1ae6b8899f64ec6cd4a941e9adeaa1efa53de027edde094ba902f6ef9
font_01_sfnt_off00010366.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10366 10956 bytes
SHA-256: b30a93286c6c9b28cbda358a65a7b87e28a758d6be4caf8a27851b11dc79d40a
font_02_sfnt_off00011c28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1