Malicious PDF — malware analysis report

Static analysis result for SHA-256 f565766d483e568f…

MALICIOUS

PDF

70.9 KB Created: 2021-09-28 23:08:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d7c11669ed04237c7affacbb76290334 SHA-1: 30aec8d3a1b3d13d41055d63668c6b448bd40ca7 SHA-256: f565766d483e568f0c83c89d7446310dd82f7d2be8968e86957c37c9cd2d7a69
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which are hosted on compromised or disposable domains, indicating a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests the document's purpose is to host a collection of links, likely for SEO manipulation or to distribute further malicious content. The ML classifier and ClamAV detection further support the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 7

  • 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.
  • 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://smidgel.ru/uplcv?utm_term=clash+of+clans+hack+version+for+download PDF link annotation
    • http://fipjp.com/userfiles/file/vufivesux.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5a63e3c7338667443813f994f30a2688/50223269036.pdfIn PDF document text
    • http://ettermanenterprises.com/ckfinder/userfiles/files/bepakulelejuzezurure.pdfIn PDF document text
    • https://mcq-exambd.com/app/webroot/ckfinder/userfiles/files/vidadej.pdfIn PDF document text
    • https://www.frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/bivuduzuvi.pdfIn PDF document text
    • https://lenaoyunlar.com/calisma2/files/uploads/rutedonixixowasogebaxanon.pdfIn PDF document text
    • http://balmybnb.com/t/tutorfirm/uploads/ck/files/jivanesap.pdfIn PDF document text
    • http://hakasasi.id/userfiles/file/bokonogowatodemowuleru.pdfIn PDF document text
    • https://norservis.cz/files/files/bulufapab.pdfIn PDF document text
    • http://www.asiacoservice.com/file/files/zenop.pdfIn PDF document text
    • http://bong-dem-long.org/upload/editor/files/15771248053.pdfIn PDF document text
    • https://idealist.ro/userfiles/file/98289572775.pdfIn PDF document text
    • http://autoscuolauniversale.it/userfiles/files/jisutobeparexoj.pdfIn PDF document text
    • http://qapoll.com/2015/vat/upload/files/mubixuxilomomamera.pdfIn PDF document text
    • http://hemeringen.de/ckeditor_ablage/userfiles/files/zeraxiluzebezunote.pdfIn PDF document text
    • http://thepducphat.com/upload/files/gojosedadalasusiwomik.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202109/file/budifuwuvowawowesaliber.pdfIn PDF document text
    • http://master-stroi76.ru/userfiles/file/rirefomesufeto.pdfIn PDF document text
    • https://psg66.ru/admin/ckfinder/userfiles/files/95918274873.pdfIn PDF document text
    • https://propiedades.net/ckfinder/userfiles/files/60236378178.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/161401474c5039---xovafaripuwilubu.pdfIn PDF document text
    • http://dspec-car.com/js/upload/files/85144298879.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/7dad36973d10a6be2ff4d2ba3fc57020/kurimavopuvulu.pdfIn PDF document text
    • http://gaudi.tw/upload/file/jejugoboradatenebo.pdfIn PDF document text
    • http://tuanlongland.com/upload/files/dabegekafodipavumidaxi.pdfIn PDF document text
    • http://enotecagaribaldi.it/userfiles/files/483047727.pdfIn PDF document text
    • 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_off0000b603.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB603 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE1A 10752 bytes
SHA-256: 50082c8325c921b369b75454e6254b01fbe8c71e8928105f71f421cb66f2a5d7
font_02_sfnt_off0000e6d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D2 15328 bytes
SHA-256: 7aa6fdb957c65ea2a098f420930accf5f6499c63490ecf0ca544eff4c311fcf4

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