Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dd4f7a0372a9cba…

MALICIOUS

PDF

85.6 KB Created: 2021-09-03 06:10:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 40faa10a27467bc0e0408fc9279f1fb9 SHA-1: 937332836631ef65a4a69e308565c9060b6564f3 SHA-256: 5dd4f7a0372a9cba30f1476a394f67d3a334dc2178029c48c9454b683afbc8b4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it likely serves a malicious purpose. The document functions as a link farm, containing numerous URLs that point to various websites, including those hosted on compromised Content Management System (CMS) upload directories. This suggests an attempt to redirect users to potentially harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • 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.
  • 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://polyalpan.hu/_user/file/56617512257.pdf In PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/3644c434bff686d512d03e37e026c956/15350500267.pdfIn PDF document text
    • https://perfecthospital.net/FCKeditor/file/47544862678.pdfIn PDF document text
    • https://debo-fit.be/userfiles/file///xisakazunigebezu.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082cb467bae3---zizulosu.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612ae0c801310---24925601296.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/goremaxuzupimovimiwus.pdfIn PDF document text
    • http://omgmediatank.com/userfiles/files/bajoxuzujebigoxobixebena.pdfIn PDF document text
    • http://szentdorottyapatika.hu/files/setujixasevemotip.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16072cc230cb92---37209991767.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1610fc4c9110a3---wedusutojalakajirap.pdfIn PDF document text
    • https://cbconsulting112.ca/userfiles/files/38257335655.pdfIn PDF document text
    • http://magendans.com/imagefiles/file/fubepuxiti.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/96291567770.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/1610d497c44861---14679728528.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/5436b078d41aec719c0867351ac1b8c4/70120072783.pdfIn PDF document text
    • http://ssteelelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/91745048589.pdfIn PDF document text
    • http://gyarmatilovastorna.hu/userfiles/file/3134230848.pdfIn PDF document text
    • http://pensionpoint.cz/userfiles/files/bagaxeferolajoxawo.pdfIn PDF document text
    • https://1877painters.com/FCKeditor/file/josiduzofugagevalim.pdfIn PDF document text
    • http://slstudio.it/userfiles/files/9360900110.pdfIn PDF document text
    • http://ddaengshop.com/ckupload/files/20885480105.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/751882c22e076efad1b5da8813565b31/90925064492.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=free+printable+comprehension+worksheets+grade+4PDF 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_off0000e954.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE954 11336 bytes
SHA-256: c5bd7ab78b4625d8e83088fd199c723dba9b8ddcd3d34480f52087bfff0a6967
font_01_sfnt_off00010372.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10372 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B84 17388 bytes
SHA-256: 87759a6477e0e9d079274556df8e85a0d5dbbe75fff48668206d6fb80dc31806

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