Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7718c32505ce82a…

MALICIOUS

PDF

78.6 KB Created: 2021-07-02 16:26:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f9680efbb035b91b0019db6a0805b766 SHA-1: 340023ac440e5ffd7b538474548e35d274c3042f SHA-256: a7718c32505ce82a5016039b048ec466fec7210791425e2465426a2770411920
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a large number of external URIs, many of which point to compromised WordPress sites hosting PDF files. These links likely serve as a link farm to redirect users to malicious content, such as phishing pages or malware download sites. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9858

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://catamma.ru/uplcv?utm_term=stream+catching+fire+free
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5fc8aac82d---gokunozaripazejagunemus.pdf
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160870b90a4f67---vesobuwoverag.pdf
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/i5ovgngh6rb8to8l77gathptfb/watutifajubedozuvirago.pdf
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/siakefn3uqrooud1a5rnmgrd7j/xegopovip.pdf
    • http://firegallery.ru/img/upload/faposisinajigevubipuwuk.pdf
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607b36bb891b3---28616887112.pdf
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/47f562eeed9f67a3d434de82159da929/bixij.pdf
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/6a7a4e7dde328517f3edd7fbaf170410/sogesufojiwenuzedaxegudar.pdf
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160774d41b91df---62630023288.pdf
    • https://dolmalatrek.com/userfiles/file/49951324557.pdf
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/3233f484f6cc03fc5a2cd43c77059e10/19578807184.pdf
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/a26bo3ikle79p87osev60k6l2u/feginomejelilezamad.pdf
    • https://aashianarealty.com/file/solerujuxefipulofip.pdf
    • http://curry-box-deluxe.de/userfiles/file/zedoxo.pdf
    • http://teplospectr.ru/images/files/49458195363.pdf
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160719c0b7be36---84841573167.pdf
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/ccrdq71220p9lov9k57ko5gup2/kuwigag.pdf
    • http://chiengthai.com/file_media/file_image/file/jirapifalepanoliwanaga.pdf
    • https://egyiksem.hu/uploads/file/14387691385.pdf
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c84ebbe7129---53637880517.pdf
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160947337e695e---68258661535.pdf
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608102d80a32b---sapurifukavologotav.pdf
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/3bd1e3410e714e7d7d5bc73d2fce23b7/44656809352.pdf
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/43778b6d643665769e0d4910633c5aa0/rixobodine.pdf
    • https://telewebmarketing.com/FCKeditor/file/samakeri.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d0caa8789ca---9323843959.pdf
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cfa8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCFA8 16792 bytes
font_01_sfnt_off0000e7bf.bin
4b9720fb51630e361fe14b59032c791ee3c880992e74de110624440f2ddde13d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE7BF 10524 bytes
font_02_sfnt_off0000ff87.bin
b95d3eb1654cfe9f9a4314b82057c559f2120ce998b0e1804f86d29cec7c10cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF87 17516 bytes

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