Malicious PDF — malware analysis report

Static analysis result for SHA-256 5214f0b2ff06853f…

MALICIOUS

PDF

82.0 KB Created: 2021-09-14 08:11:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 158361e2685188bba6fb1c75835f67d0 SHA-1: 4a146335d69f6e4881adc941a30167a81983acb0 SHA-256: 5214f0b2ff06853f0c4bbdd9b847640d42434e7a122c672254930900ea4ce7c8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to disposable hosting domains, suggesting a link farm designed to distribute malicious content or phish users. The presence of embedded URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicate an attempt to obscure the true malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://wxmx.cn/upload/ckimg/files/202109052329296551.pdf In PDF document text
    • http://lateonsettay-sachs.org/userfiles/file/66183816566.pdfIn PDF document text
    • http://zygzak.eu/foto_dane/wysiwyg/File/zifexuxebusitutet.pdfIn PDF document text
    • https://cottonweb.net/userfiles/file/1739441184.pdfIn PDF document text
    • http://futureinfashion.com/ckfinder/userfiles/files/15614131505.pdfIn PDF document text
    • http://pressvaluation.net/FCKeditor/editor/filemanager/connectors/userfiles/file/11128460257.pdfIn PDF document text
    • https://presentkompaniet.com/img/content/file/19329734915.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/161376d47a4bea---kegurozodetofabamaxalip.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/b021bc25a47497bc68889ca1c33c52a5/wimemunowejanizifoxik.pdfIn PDF document text
    • http://vinhhangvien.com/upload/files/kosoxa.pdfIn PDF document text
    • http://tnshoppingbag.com/upfiles/file/patijudewotiwamutezugi.pdfIn PDF document text
    • http://rybarict.cz/webpagebuilder/ckfinder/userfiles/files/63931611122.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/15d8bba8b7df4797f7c17abb7c42aa54/xidapa.pdfIn PDF document text
    • http://chi-kara.net/Upload/files/jaxulapolibov.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/c0tuvsdcpkgtqk1iehp1o329p6/kufezuxaregabegule.pdfIn PDF document text
    • http://e-sportis.com/images/upload/dotipetozulaxaduladumazak.pdfIn PDF document text
    • https://fisheaglesafaris.net/pics/user/file/64009874619.pdfIn PDF document text
    • http://biswasi.com/userfiles/files/52352060560.pdfIn PDF document text
    • http://waterlootour.com/FileData/ckfinder/files/20210911_34EC5ABC0CB23081.pdfIn PDF document text
    • http://stringladies.cz/userfiles/zaxupalawifugepezimax.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/a17aff42925fae363c4d823c6355c0fc/83375295739.pdfIn PDF document text
    • http://xz-brand.com/ckfinder/userfiles/files/27718964415.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=bixby+commands+galaxy+watchPDF 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_off0000d9d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D1 11080 bytes
SHA-256: 93b7bcd7592fcbbc4c2dc3819c266ffdef6bf83c90b9dadbee3490c8d4c272a9
font_01_sfnt_off0000f359.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF359 18312 bytes
SHA-256: 7bc27ef3d2622a91dea9db2eac2442df811e2edbe9ee1da033a801345731cbbc
font_02_sfnt_off000122ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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