Malicious PDF — malware analysis report

Static analysis result for SHA-256 d20bd5284b271ec1…

MALICIOUS

PDF

83.9 KB Created: 2021-09-16 12:08:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: a782d9897459c4a14435ecf839e51c23 SHA-1: 56374f3b6daed9944615eecea844a65f86fa56dd SHA-256: d20bd5284b271ec11164c4bf5d6d19e8bf4e18397524f6666fe01d3db98bd7ff
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external websites, some hosted on potentially compromised or disposable domains. The embedded URLs suggest an attempt to lure users to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://allefrgycg.news-read.com/upload/files/73827104143.pdf In PDF document text
    • https://www.prshots.com/ckfinder/userfiles/files/15341467303.pdfIn PDF document text
    • https://principesgs.com/userfiles/file/retezef.pdfIn PDF document text
    • https://invest.pl/userfiles/file/47160334113.pdfIn PDF document text
    • http://ping-property.com/user_img/files/kazogo.pdfIn PDF document text
    • https://heuresromantiques.com/upload/files/86265588311.pdfIn PDF document text
    • http://bsa-billiard.by/images_from_html_editor/file/genodiwowitebidukilujik.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/eomm3lvq3pj094e0cu2dhmmp35/46761463663.pdfIn PDF document text
    • http://cecev.com/stockages/files/41712648757.pdfIn PDF document text
    • https://academiapreprod.riportico.com/userfiles/files/21389716122.pdfIn PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/23441015640.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/638a7325555f5a6111922da5d5a8a6a7/83437707273.pdfIn PDF document text
    • http://briztravel.com/upload/files/47455888405.pdfIn PDF document text
    • http://primeasset.hu/fileok/file/zabajironoxejin.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/a28def6687faf72c70ddec036dc3cd75/xobabalikokosatan.pdfIn PDF document text
    • http://attep.com/home/sandbox/domains/heekee.com.hk/public_html/ckfinder/userfiles/files/77526891010.pdfIn PDF document text
    • http://murito.fr/ckfinder/userfiles/files/38208698351.pdfIn PDF document text
    • https://clinicscrm.com/img/files/72058784031.pdfIn PDF document text
    • https://delphin-bau.com/ckfinder/upload/files/lavusutofexeb.pdfIn PDF document text
    • https://www.pessin-location.fr/ckfinder/userfiles/files/xojusudesexuwaxejesasi.pdfIn PDF document text
    • http://anninh247.info/upload/files/sitibezijumab.pdfIn PDF document text
    • http://china-miyaco.com/img/file/2021911104930.pdfIn PDF document text
    • http://ceskylakros.cz/userfiles/file/86256388944.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=vivavideo+paid+version+free+downloadPDF 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_off0000dff1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF1 10516 bytes
SHA-256: 346214b842ddb78dceea909f838d2cd3fd4eff080b4eaef768dc4a753508fb15
font_01_sfnt_off0000f800.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF800 19192 bytes
SHA-256: 272f87941fdc1dbd2d1d03276adcc7efb09903656d9bbd6fcddbcbee6dfb0d17
font_02_sfnt_off000129cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1