Malicious PDF — malware analysis report

Static analysis result for SHA-256 c221d71620fd3857…

MALICIOUS

PDF

81.1 KB Created: 2021-10-10 02:02:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: e8ead01d0a69f8707a18ad7b388ce4fa SHA-1: d9b1d33388fd9d2004394e3a897ea490f3876ddb SHA-256: c221d71620fd3857c21a500cbc586c891a21f8d5731d1835539b3ad3ed880b0a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to multiple compromised websites, including a WordPress upload storage, suggesting an attempt to lure users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://pistant.ru/uplcv?utm_term=are+green+beans+good+for+digestion PDF link annotation
    • http://myconnect-thailand.com/image/upload/File/sozola.pdfIn PDF document text
    • http://teen.plovdivweek.com/js/ckfinder/userfiles/files/81639052232.pdfIn PDF document text
    • http://fpempresa.cen.es/userfiles/files/jupojagusotoxe.pdfIn PDF document text
    • http://marklaliberte.com/fckupload/file/vefelosuzigusuw.pdfIn PDF document text
    • http://gadkowski.pl/repository/filemanager/file/zepivuvijekap.pdfIn PDF document text
    • http://honda-vo.com/upload/file/72758048250.pdfIn PDF document text
    • https://hankilfood.com/userfiles/file/20210914015642.pdfIn PDF document text
    • http://01host.ru/userfiles/files/19942885288.pdfIn PDF document text
    • http://area100impianti.it/userfiles/files/xoxonurokamiveja.pdfIn PDF document text
    • http://3qbuy.com/CKEdit/upload/files/bajuk.pdfIn PDF document text
    • http://www.instalacionescueto.com/nueva/ckfinder/userfiles/files/zodebiwigumajako.pdfIn PDF document text
    • https://nuttydog.hu/ckfinder/userfiles/files/wazaxu.pdfIn PDF document text
    • http://www.vandiestbrandstoffen.be/uploads/files/xusezoso.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/8c080fd231e9560910a9dc7ee499c07d/ziretikisugus.pdfIn PDF document text
    • http://antonellascarpittadesigner.it/userfiles/files/67517770049.pdfIn PDF document text
    • http://myarrahnu.com/mo_images/files/siwix.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161306dc54e39f---33387927810.pdfIn PDF document text
    • http://realtor-madrid.com/uploades/fckeditorfile/38919470.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/876bd2109a42d1cbc930e23d09d50b58/79275130682.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/8bd0e41ff671298ac0fb034d29ec0c14/wivimalazanujusatin.pdfIn PDF document text
    • http://sevimticaret.net/userfiles/file/27951807839.pdfIn PDF document text
    • http://xn--j1aii.su/userfiles/file/fifol.pdfIn PDF document text
    • https://derechosenred.org/aym_image/files/wegitixo.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_off0000d880.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD880 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f092.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF092 17904 bytes
SHA-256: 23eb1e3498c655179193be9a0b9f35d8135cb8988da9f02e0a144502fcb1f7d6
font_02_sfnt_off00011e7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E7B 10604 bytes
SHA-256: d56f7cf11dbc6c43b593d25874b47946d4721b0b414c2a92f159e98d64afb219

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