Malicious PDF — malware analysis report

Static analysis result for SHA-256 7883ee524d7da4e9…

MALICIOUS

PDF

82.3 KB Created: 2021-09-19 04:34:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 110a50be76e0d02d175db890f52113dc SHA-1: a5094d63ceef783c598e63526157c1ae796d5bda SHA-256: 7883ee524d7da4e9913b701ef5417574f12eb2e787d9257a4c4576eb1e41abfe
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and multiple links to external URLs, many of which are hosted on compromised or disposable domains. The presence of a high-severity heuristic for 'PDF_RANDOM_URL_LINK' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' indicates a strong likelihood of malicious intent, likely to redirect users to phishing sites or download further malicious content. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://catamma.ru/uplcv?utm_term=gi+joe+retaliation+watch+online PDF link annotation
    • https://bazk.info/public_htmluploads/file/pirijeli.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/widubuzirugomatem.pdfIn PDF document text
    • https://ewt.cz/res/file/najovurikuz.pdfIn PDF document text
    • https://thebillionbottom.com/business_school/uploads/file/4134108383.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/161404ef78573c---66286688483.pdfIn PDF document text
    • http://staresecurity.com/userfiles/file/nufawuwojesesuwava.pdfIn PDF document text
    • http://avandcie-energy.com/ckfinder/userfiles/files/98840102953.pdfIn PDF document text
    • https://citytrafik.nu/images/file/42193746678.pdfIn PDF document text
    • http://chamdure.com/DATA/files/20319121083.pdfIn PDF document text
    • http://matchedtubes.de/userfiles/file/50540792965.pdfIn PDF document text
    • https://mashtalkandil.com/userfiles/file/20972434266.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613819a8ca464---lokabodifijifuvegoxe.pdfIn PDF document text
    • http://motovelo-nmsk.ru/userfiles/file/bajerugapesebozogetitu.pdfIn PDF document text
    • https://westhigienia.hu/editor_up/tewadujuza.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/16146852e61b02---zimel.pdfIn PDF document text
    • http://twsl.mingann.info/upload/ckfinder_temp/files/20210910162326.pdfIn PDF document text
    • http://noithatmyhome.com/img/files/jabuzej.pdfIn PDF document text
    • https://bankkartya.hu/js/ckfinder/userfiles/files/82062397960.pdfIn PDF document text
    • https://gikguamerica.com/userfiles/file/18614344865.pdfIn PDF document text
    • http://carnavaldemarbella.com/Senegal_5/Content/files/userfiles/file/madotabejowarusarunix.pdfIn PDF document text
    • https://residenciasanamaro.es/userfiles/files/gisajixitebowenuzefaja.pdfIn PDF document text
    • http://danguykhoidoanhnghiephp.vn/Upload/files/pepakotemoxetetun.pdfIn PDF document text
    • http://lucidareemantenerepavimentifaidate.it/userfiles/files/sokesitigitegoj.pdfIn PDF document text
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/a54eb33647c627e5cb76d5954a62cc7f/57415017623.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_off0000dd9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD9A 17844 bytes
SHA-256: 011b216899032dd0e07468f8d5c93967f926ae42095ef9f6f7748d9c5a042f0d
font_01_sfnt_off00010bc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC1 10412 bytes
SHA-256: 6ecddce306b9ff36112c1571cd744ae4e5fe2f5c1cc80cfec07c132c56be890d
font_02_sfnt_off00012349.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12349 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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