Malicious PDF — malware analysis report

Static analysis result for SHA-256 3122eb5ee803ccc7…

MALICIOUS

PDF

78.7 KB Created: 2021-09-09 03:27:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a74a22937322f4951cc62573e63d2814 SHA-1: 2b2403bb6b823d67ece4377ac0ffa4a4c5291ff0 SHA-256: 3122eb5ee803ccc74b8d42459eeeb1781b4a67b24e7e04d70a80b9ec7da90bc1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript and a large number of external links, many of which point to potentially compromised websites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The embedded JavaScript is a common technique for executing malicious code within PDF files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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 http://macabrey-luthier.fr/data/Files/xaratatutupozepalijal.pdf In PDF document text
    • https://sandipkumardutta.com/ckfinder/userfiles/files/kepakenanenar.pdfIn PDF document text
    • http://acsalma.hu/userfiles/files/30000510970.pdfIn PDF document text
    • https://xn--80aesyq.xn--p1ai/files/file/78685789204.pdfIn PDF document text
    • http://gaishachuukobuhin.com/js/upload/files/96411811571.pdfIn PDF document text
    • http://mimarkamilozkartal.com/userfiles/files/dilifamaf.pdfIn PDF document text
    • https://doxity.ro/ckfinder/userfiles/files/gadafopogerogexadigadolov.pdfIn PDF document text
    • http://njuhome.pl/ckfinder/userfiles/files/gubosiliwozilujok.pdfIn PDF document text
    • https://mfdesign.hu/files/file/viserobiruna.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/40b23128ff957358c6b974b05690e7b6/43340717367.pdfIn PDF document text
    • http://obchodsezlatem.cz/upload/files/58252466557.pdfIn PDF document text
    • https://slotpt2.com/contents/files/27918081771.pdfIn PDF document text
    • https://ncltandatbar.com/home/ncltandat/public_html/dowalumniusa/ckfinder/userfiles/files/30671661297.pdfIn PDF document text
    • http://playitdirect.ca/ckfinder/uploadfiles/files/vakagotimelenulixagupuw.pdfIn PDF document text
    • http://ouhkpthaa.org/userfiles/vagal.pdfIn PDF document text
    • https://xn--90ah6akb9e.xn--p1ai/f/file/bezunewodarajidawiwipujep.pdfIn PDF document text
    • http://htwy.com/upload/file/wudotixowatapavedofuz.pdfIn PDF document text
    • http://www.cemeba.com/uploads/ckfinder/files/80333051198.pdfIn PDF document text
    • http://m-camper.ru/ckfinder/userfiles/files/82922216820.pdfIn PDF document text
    • https://diphong.com/uploads/xeduxilimabotobokesi.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16131fde615c47---gagilezarugoroxesenalen.pdfIn PDF document text
    • https://isuzuphonoi.com/data/dulieu/files/dulejonopejanejidemijon.pdfIn PDF document text
    • http://proreferee.ru/uploads/ckfinder/files/zebunomepunulosokum.pdfIn PDF document text
    • https://keyword-lda.pt/site/upload/file/saluj.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613303d4b25c5---daragogukoje.pdfIn PDF document text
    • https://vvpta-irvine.org/userfiles/file/44762910180.pdfIn PDF document text
    • http://webinaris.training/ckfinder/userfiles/publics/files/peritor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=crazy+cooking+star+chef+mod+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_off0000c91a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC91A 18844 bytes
SHA-256: 28532b4fb6362b7eb0b63b588938e06804fe3a1970fc1aff46736c6d4b9793f9
font_01_sfnt_off0000fa7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA7A 11316 bytes
SHA-256: de4364af437e8b15d31c9d9af8e385dd30f83d3aa8c3157c673cf47ff85a0212
font_02_sfnt_off000114d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1