Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2315b8da2df1ae8…

MALICIOUS

PDF

69.0 KB Created: 2021-10-04 11:04:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: aed3b158de4f9a535341d34afde404e9 SHA-1: ea3b7ba3aa7383fa78e4744873168613a0f853d7 SHA-256: b2315b8da2df1ae84897bc0c5dd8b9c30ccdc675fcc10f3f81c3f4dd768c6420
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which point to websites hosted on compromised CMS platforms or disposable domains, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9959

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 https://medvor.ru/uplcv?utm_term=romantic+classical+music+for+weddings PDF link annotation
    • https://redac.ch/upload/jemesubaniwi.pdfIn PDF document text
    • http://ateliergermain.club/sites/default/files/file/79007911373.pdfIn PDF document text
    • http://worldnaturalfood.com/image/upload/File/repevafawifizuvobutamen.pdfIn PDF document text
    • http://yansyuan.com/UserFiles/images/files/59526677918.pdfIn PDF document text
    • https://mkontakt.com/dat/file/98599125318.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613583b270c05---29356226117.pdfIn PDF document text
    • https://kaimano.it/file/66692970469.pdfIn PDF document text
    • http://hani-bee.com/userfiles/files/78812411519.pdfIn PDF document text
    • http://flamefitnessstudio.com/cewit/images/file/xiveloxavad.pdfIn PDF document text
    • http://iscyber.com/userfiles/files/lanijezosuxenos.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16136f62120fb6---9129009694.pdfIn PDF document text
    • http://www.oteliapelsin.ru/ckfinder/userfiles/files/47916371950.pdfIn PDF document text
    • https://niboparis.com/upload/fckeditor/files/paxamorigelarisubudine.pdfIn PDF document text
    • http://www.ufolep-69.com/contenus/files/29283495941.pdfIn PDF document text
    • https://daiichitravel.com/uploads/news_file/pozadopamanaj.pdfIn PDF document text
    • http://gitimohammadilakhimpur.org/ckfinder/userfiles/files/desifovojavufok.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/hadgepoltlsdco0lslbo6ufvj3/56924974324.pdfIn PDF document text
    • https://mlbcsimleague.com/ckfinder/userfiles/files/sinurozovesi.pdfIn PDF document text
    • http://hoinhikhoavn.com/img/files/96519626478.pdfIn PDF document text
    • http://www.vegagastro.pl/upload/file/bexitoga.pdfIn PDF document text
    • http://sor1310.com/userfiles/file/44465847812.pdfIn PDF document text
    • http://www.toptehnik.si/images/74381510692.pdfIn PDF document text
    • https://actionsporting.com/userfiles/files/28066247779.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_off0000adb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADB3 15064 bytes
SHA-256: f81fe246c59076a7ed89e0f6b47d3b2f757be4f16e5dcd333c2ee23dca0d244b
font_01_sfnt_off0000d35d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD35D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eb74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB74 11048 bytes
SHA-256: f8d4696648f5c5f2648a4dc4ade3f3f681564c6e96eadc3d5997139cf6d45ba1