Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d83218db14ae904…

MALICIOUS

PDF

149.2 KB Created: 2021-09-07 01:05:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: be0ca9538e2bd1cecd22473a0ed3169c SHA-1: 0f2fa2bfc83de2ecb8e95031c9700d790cdad06a SHA-256: 2d83218db14ae904d3d71f43ea06ce0e0cceaaded8838c2a7f9eade5c529254b
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains a link farm pointing to multiple compromised WordPress sites and other disposable hosting, suggesting an attempt to distribute malicious content or phish users. No scripts were extracted, and the document body was unreadable, but the heuristic findings strongly indicate a malicious intent to redirect users to external, potentially harmful, URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160763946488e0---3209651136.pdf In PDF document text
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/b9dcf4c35a68a2e185e148ef4a74a682/99437721997.pdfIn PDF document text
    • http://lindendirect.com/tempimg/file/60432226346.pdfIn PDF document text
    • https://congchung7.com/upload/file/luvuxofuduzofasav.pdfIn PDF document text
    • https://stmpallet.com/ckfinder/userfiles/files/34094343455.pdfIn PDF document text
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/bd2cb4dac572de88f518561af34bd439/dakanasenizogobox.pdfIn PDF document text
    • http://sivam.pl/files/file/mekogopiraparadebo.pdfIn PDF document text
    • https://stiff.pl/ckfinder/userfiles/files/41502402275.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607377d44e95f---ruferiwakawesupatepiniz.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff6a5f02a6---22116398874.pdfIn PDF document text
    • http://www.dogwoodagility.nl/ckfinder/userfiles/files/35647265728.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/osnd53tbgo6jn9t9jvn6o4svpt/30985508330.pdfIn PDF document text
    • http://batiment-tunisie.com/userfiles/file/27798685561.pdfIn PDF document text
    • https://stiff.pl/ckfinder/userfiles/files/fabutezemalaf.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa1b87fdf8---2082669195.pdfIn PDF document text
    • http://zoncmswebsitebeheer.nl/files/editor/file/60655512460.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/1df0544284dd2e2569a0ab5eb5916c32/75213245496.pdfIn PDF document text
    • https://ljlconst.com/admin/images/file/dowaje.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/05f07dff0fec835567e03284cf796f32/83119728482.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160dda42c2f08a---42705775673.pdfIn PDF document text
    • http://www.mariabeckmann.com/fotos/uploads/files/wifobosebadonini.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/24092637959.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=interrogatorio+definicion+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_off0001e388.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E388 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001fb9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FB9A 20052 bytes
SHA-256: f4ed2d92514d6dbbe1f8bd4222da261af742389b690c3db5212367c92e265bf3
font_02_sfnt_off00022eb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22EB4 10532 bytes
SHA-256: 585eccca19b7544b0f82f20c7960a41b003650dd3278d0c82bc04c1fc4d01a35

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