Malicious PDF — malware analysis report

Static analysis result for SHA-256 2314af8d69aea5bf…

MALICIOUS

PDF

87.3 KB Created: 2021-07-23 21:26:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1d78d35cc78f33482d489a93ffef0ec0 SHA-1: 1f9d5c27cbafba6bf8e0132fd6e3fc256d07b163 SHA-256: 2314af8d69aea5bf28554441879a4eef7033bd1ae7619234e97505da3ff0e40a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, lacking discernible user-facing content, further supporting the interpretation of it being a malicious container.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086588a23fc9---fefovesadaroxes.pdf In PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1607f22d708e22---95787975856.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/l0s6onjm43uq8p0p7fntmcecr6/63286785514.pdfIn PDF document text
    • http://magogaralbamoble.com/galeria/files/mopabegekafafagutid.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c524411f408---60188618302.pdfIn PDF document text
    • http://www.mediagrand.hu//data/editorfile/81817568664.pdfIn PDF document text
    • http://pomocnaukowa.net/Upload/file/baxobudigepa.pdfIn PDF document text
    • http://www.look4job.gr/images/_user_na/file/suwojigudojudezapoxo.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160dccc51138ef---39715704633.pdfIn PDF document text
    • https://aarhuskortet.dk/images/file/tivilus.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/df44f293086a0d509d6a4484eedb0df3/lojadi.pdfIn PDF document text
    • http://musiconthebay.org/clients/2/26/269dd5bc96e197da989a8dccc71442af/File/47262029087.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607251135611a---taretosefidixidoxelilet.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/fidekuvedefak.pdfIn PDF document text
    • https://ms01bet.net/contents//files/33363464671.pdfIn PDF document text
    • http://cesmclassof68cheyennewy.com/clients/82478/File/39652710348.pdfIn PDF document text
    • http://anadarkogomezfamily.com/clients/7/76/76920377ef4e0cfe2c6e77079a05cbd4/File/buxufavinitaju.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/c319e52baeaf3b7b0711bdc59d729917/vovuworozapovuxum.pdfIn PDF document text
    • http://moje-stranky.eu/userfiles/file/nasuva.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-22/20210522072022443720.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/78078305021.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db1ccd1981d---29945755164.pdfIn PDF document text
    • http://hrjok.com/uploadfile/file/92668647898.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=blossoms+of+the+savannah+questions+and+answers+pdf+downloadPDF 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://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_off0000f421.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF421 17008 bytes
SHA-256: c09835979c090247a2124e93695216c62b6c7dfc6b1e37da864d801340cadf59
font_01_sfnt_off00011ffc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FFC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013813.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13813 11212 bytes
SHA-256: ad768ebb99b674a2706eec73938f7061a680ffc1f0be87074e3e6be9e80f4299

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