Malicious PDF — malware analysis report

Static analysis result for SHA-256 d57ea47165f11cca…

MALICIOUS

PDF

79.3 KB Created: 2021-09-04 07:06:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7d69be8343ebca35b0a4fa1e2f3d9e61 SHA-1: 5480f26b1818debd15922aeea55606ed02c8d6f8 SHA-256: d57ea47165f11cca5fd3570d879968ab9ab7f9b9edb781aa22986fb41ae7d7e1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is identified as malicious by ML classifiers and ClamAV, and it contains a significant number of embedded URLs. Many of these URLs point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. The primary attack pattern involves luring users via a spearphishing attachment to a PDF that then directs them to external, untrusted sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/160a24f1d7b995---kezikovowinugubudewasupan.pdf In PDF document text
    • http://7166867.ru/ckfinder/userfiles/files/41941156715.pdfIn PDF document text
    • https://inwestorfinanse.pl/userfiles/file/temubukomosidusut.pdfIn PDF document text
    • https://principesgs.com/userfiles/file/23183768406.pdfIn PDF document text
    • http://doo-san.com/userfiles/file/20210612061008.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b81faeb8eff---68564940047.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/26277234455.pdfIn PDF document text
    • http://shuswapladystriders.ca/userfiles/file/67093212301.pdfIn PDF document text
    • https://wroclawmodelshow.pl/ckfinder/userfiles/files/56720660187.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609f82272f873---geneposujutotipadisusezo.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/jbrqsloqvm0r0v35i68kp9ictt/didatesefuluzo.pdfIn PDF document text
    • http://vanlysecurity.vn/vanly/album/files/jupob.pdfIn PDF document text
    • http://jarosi.hu/files/file/vizudisisenut.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080f4231a13f---94445729787.pdfIn PDF document text
    • http://maxgear.cz/webpagebuilder/ckfinder/userfiles/files/dedosiziro.pdfIn PDF document text
    • http://randygordonlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fufamaguzawenoka.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1612cf6d4e16d2---gakowivipokijasirejijepiw.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/s4bs3u35hro2djv161svgpi3sa/8409721808.pdfIn PDF document text
    • http://excitechem.com/userfiles/file/55613005134.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/c7822499f4942c72d54c08b950807024/gutafil.pdfIn PDF document text
    • http://aclamerica.com/customers/CMS-IMAGES/file/wufusuvafulowafojorogijov.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/2d2ddd69f340a344f9a9b8608b035830/tazuviguwoda.pdfIn PDF document text
    • http://clairerolo.com/userfiles/file/36313118414.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=vocabulario+en+ingles+con+su+pronunciacion+y+significado+pdfPDF 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_off0000ce33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE33 18616 bytes
SHA-256: b60b42a9f311cd881d7e01e4a63f7709edec915aa7aec484936124dc91846cd9
font_01_sfnt_off0000fdad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDAD 11020 bytes
SHA-256: 8e31b953e1e57c3cc6d5860f6bb41d1d5f460a6bcfa99a949aaf9ab96892d278
font_02_sfnt_off000116fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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