Malicious PDF — malware analysis report

Static analysis result for SHA-256 7559bf562b6a9f1d…

MALICIOUS

PDF

75.1 KB Created: 2021-10-03 12:07:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 64c5f7857e5fa9921d3b20fecca82c58 SHA-1: 8f439dbf1c618a1fd6ff8fc09ae3389a054e2bb2 SHA-256: 7559bf562b6a9f1d6c1e2a5ace20041a379248b35fbae9b05968f51af17ce641
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, which is often used to redirect users to malicious websites. The numerous external URIs and link farm heuristics indicate a strong intent to direct users to potentially harmful content, likely for phishing or SEO abuse. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://ketchas.ru/uplcv?utm_term=which+among+the+following+is+a+non+renewable+source+of+energy PDF link annotation
    • http://cardealer-space.com/js/upload/files/86237511122.pdfIn PDF document text
    • http://www.lukoilmarine.com/ckfinder/userfiles/files/pawikoramigosisuvelowero.pdfIn PDF document text
    • http://penzionriverside.cz/files/file/96118915377.pdfIn PDF document text
    • http://adatarimhayvancilik.com/Images/Media/files/pavaxezamovosojito.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/nekpdt3t5ets164og4bmdhn576/86336822506.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16139ef527b62b---jedugakeno.pdfIn PDF document text
    • http://fsnmmaterials.com/UPFILE/userfiles/files/88413723509.pdfIn PDF document text
    • http://gsxr.hu/userfiles/file/1252580828.pdfIn PDF document text
    • https://pasarant0g3l-turbo-h1t.com/contents/files/20359731785.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3c065f38c92fa080b535a6ed3927c7ff/vuxipoki.pdfIn PDF document text
    • https://biocoils.com/img/file/vidom.pdfIn PDF document text
    • http://skalamatbaa.com/userfiles/file/89332780858.pdfIn PDF document text
    • http://crabandclaw.com/uploads/files/59617366832.pdfIn PDF document text
    • http://heaig.org/editor/ckfinder/userfiles/files/22913236187.pdfIn PDF document text
    • http://ambulatorioveterinariocamali.com/userfiles/files/23160008723.pdfIn PDF document text
    • http://bjsixiang.com/jingkelun/userfiles/files/20210924105245.pdfIn PDF document text
    • https://glamweddingdesign.com/userfiles/file/43326831296.pdfIn PDF document text
    • https://etevent.itweald.com/uploads/files/61434dda5651c.pdfIn PDF document text
    • http://schroniskoorzechowce.pl/ckfinder/userfiles/files/nosujawuvutenuxema.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/161368c73a713d---31584282362.pdfIn PDF document text
    • http://websteravelandscaping.com/editorData/file/51084774425.pdfIn PDF document text
    • http://fli.edu.mn/ckfinder/userfiles/files/lowotule.pdfIn PDF document text
    • https://quote-supermarket.com/userfiles/file/8340416694.pdfIn PDF document text
    • http://vip-cond.ru/userfiles/file/somadu.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_off0000baba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBABA 18316 bytes
SHA-256: 2c72e559b9fe714c793de2c053ee72f4f30082e968946cc0ebf0b91d7b23828d
font_01_sfnt_off0000e9b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000101c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101C8 11216 bytes
SHA-256: 90b946b2d8dffb3651b14af1280d4c2aa74e4efa18f63b049582f48d8b4f63c8

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