Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c6596ef116e8f7c…

MALICIOUS

PDF

75.9 KB Created: 2021-09-17 07:48:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 0b0c894913adbcc30d3d67672deab7a3 SHA-1: 145ea9f36a1a77d79954349291dd0fa05d721ddd SHA-256: 9c6596ef116e8f7ce8b0f2f7ae09daf11b35ec3c383b6327399c1c4f7ce40c02
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. It also features a link farm pointing to numerous external URLs, many hosted on potentially compromised or disposable domains, suggesting an attempt to obscure the final malicious destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://teater77.nl/userfiles/file/xivunegud.pdf In PDF document text
    • http://boekenwinkelindex.nl/images/uploads/patodokewivukasuboj.pdfIn PDF document text
    • http://miraesusan.com/ckupload/files/10935775123.pdfIn PDF document text
    • http://danguykhoidoanhnghiephp.vn/Upload/files/sopumugomefilugukivalaf.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613a6133a9597---70491546302.pdfIn PDF document text
    • http://travelci.ru/ckfinder/userfiles/files/todobigibujo.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/2b3c6c0db08dfb78e99216eca5ac8032/dulopanizuxiwapakubatat.pdfIn PDF document text
    • http://446888.top/userfiles/file/70869427520.pdfIn PDF document text
    • https://lanegarrett.net/userfiles/file/45572853871.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/161403d7b0f737---xebinu.pdfIn PDF document text
    • http://shriadinathbank.com/uploads/84056400829.pdfIn PDF document text
    • http://osteriailgalloelinnamorata.com/userfiles/files/vezisugapasebogodoseru.pdfIn PDF document text
    • http://m-styleauto.com/js/upload/files/16651560232.pdfIn PDF document text
    • https://ashasuchikala.com/ckfinder/userfiles/files/fukoragefewebadob.pdfIn PDF document text
    • https://xn--p3t29jo1ed4o4xw.tw/upload/files/85762052582.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161398304500ce---nezopuxavezax.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143932263e2a---numivobagidujuwixod.pdfIn PDF document text
    • http://lamexmarket.com/uploads/files/95406649263.pdfIn PDF document text
    • http://labotinnghia.com/img/files/lemifuzoromiparis.pdfIn PDF document text
    • http://itnetworkconsultingsf.com/helpdesk/app/webroot/img/userfiles/files/18941327602.pdfIn PDF document text
    • http://www.julietlandau.com/fckeditor/userfiles/file/pewafunasegu.pdfIn PDF document text
    • http://xn----7sbabaajmdfbk3ddf3azka3b6a2r.xn--p1ai/ckfinder/userfiles/files/75958925276.pdfIn PDF document text
    • https://patriciogaete.com/upload/file/81847505517.pdfIn PDF document text
    • http://enjoybowlramenandpoke.com/uploads/files/medenusizotakafopanezoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=dragon+ball+z+budokai+tenkaichi+3+apkPDF 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_off0000c3b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3B9 17152 bytes
SHA-256: a23afd3a0cfbaa70674043f25dd7c80c429fbf4600fb7f16b01641199b6f380d
font_01_sfnt_off0000efa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA4 11188 bytes
SHA-256: b044b90c262f4926607f7bdc816faa5c5662258c804c5ffb983774c96d28d41c
font_02_sfnt_off0001095d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1095D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1