Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa158b7b74f1698c…

MALICIOUS

PDF

86.0 KB Created: 2021-08-10 09:24:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a7a9636bfa6171eee74a95cdf8db8143 SHA-1: aba2d8ac57a247d9eed4dfd7e5c59a55aa778483 SHA-256: fa158b7b74f1698ccff759d62cf6feb3bcadcf65e2a9118be5f7399b3d2875c3
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and a machine learning classifier indicated a high probability of maliciousness. Numerous embedded URLs were found, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The document body was unreadable, but the heuristics strongly indicate a phishing or malware distribution attempt.

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 https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608be80a17dd8---63795091572.pdf
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb2de6dd77e---77702054178.pdf
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a26c85b4265---zupugafajemapija.pdf
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/cf4cfbf05c9158b31d23be22169686a8/vizubuvevura.pdf
    • http://debandhelder.nl/ckfinder/userfiles/files/12105565547.pdf
    • https://bishopsalamatkhokhar.org/userfiles/file/42748253477.pdf
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084e5f86793f---joxurawejigomuv.pdf
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/cd5fa5bc0b2fc6efcab9dcbbf3658065/nabiku.pdf
    • http://aarogyamedico.com/userfiles/file/bamijutupusivemut.pdf
    • http://metalzilembo.it/userfiles/files/92884928606.pdf
    • https://adian.eus/files/galeria/files/58242157355.pdf
    • https://alixdemassy.fr/userfiles/file/vevagakivowipawetalo.pdf
    • https://accuratesearch.com/userfiles/file/18181914310.pdf
    • http://www.supair-lux.hu/ckfinder/userfiles/files/81260960624.pdf
    • http://vitali-schulz-eiskunstlaufen.de/userfiles/files/borijowuronijakowo.pdf
    • http://pietroquatriniarchitetto.eu/userfiles/files/80625636343.pdf
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160758e49c0892---ridexoxirejava.pdf
    • http://4bx.pl/public/file/6985690968.pdf
    • https://atl-50.com/files/file/23444402199.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=evitando+el+amor+pelicula+completa+en+espa%C3%B1ol+latino+-+youtube
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf6f.bin
652694f9f9c32dbe84814203c4c2be23bc81f3fa20b03379a7709fdd4b89733e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCF6F 18284 bytes
font_01_sfnt_off0000fdfe.bin
31e6fb55d547774e818571b8d6c2719431f0387201823f67b27ff83b55ab33a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFDFE 11320 bytes
font_02_sfnt_off00011820.bin
4450951fe869b3d88537032137c601d93959fce05cce18e8933cd9d479eb228c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11820 16764 bytes
font_03_sfnt_off00012f25.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12F25 16792 bytes

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