Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8678d453835c94e…

MALICIOUS

PDF

91.2 KB Created: 2021-06-26 02:49:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c3d4e8b874ffdaed92c0067f7cc0525a SHA-1: 7fa3e65a717e821fb6ccc6e6cb3305b1c4dba64c SHA-256: f8678d453835c94eee1e5bf3d04f56680ce1a553a7c74fa27a7143cdab90813b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution intent. It functions as a link farm, directing users to numerous external URLs, many of which are hosted on compromised WordPress sites. The presence of external URIs and link farm heuristics strongly suggests an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://coretry.ru/uplcv?utm_term=goatee+with+stubble+on+cheeks
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078e433b658e---vizafok.pdf
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/f18e5697c32b735124e3ded4041a9aac/pilojumujekewazetegijo.pdf
    • http://lalinpress.com/ckfinder/userfiles/files/gupobetujezifinijerut.pdf
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/b45a0d4252879fc9d356abad9571a81c/xivusixesejutujuze.pdf
    • http://luxmeterthai.com/ckfinder/userfiles/files/siluzunat.pdf
    • http://barcelonasixtytwo.com/userfiles/file/demitefulav.pdf
    • http://szao-spb.ru/images/news/file/45425072081.pdf
    • http://kondicionery-ivanteevka.ru/upload_picture/file/zewawuzowapegi.pdf
    • http://rkmaster.ru/uploads/files/benerofoxuzejux.pdf
    • http://omgmediatank.com/userfiles/files/xokaj.pdf
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160867fca8100b---dupojopasatorasibeneg.pdf
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/44413a734cbc57e4bb1a2debffc500f0/vetuf.pdf
    • http://rapabzenec.cz/obrazky/files/5680496367.pdf
    • http://stananddiane.com/clients/6/67/672a2699e369d648dd23e03de9deda78/File/43911040949.pdf
    • http://sbsinternationalschool.org/sbsisnew/userfiles/file/dejiboviga.pdf
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a17a8ec315a---nekeroxedezajakofa.pdf
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/4fea8a0c73427fb0eb53d037505b2772/41369214427.pdf
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/6dof8mrr11sh1ekhpbb512rq0e/babavuvikenonimujixiz.pdf
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a18f621efdd---zixad.pdf
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/sqd08advs119fqp1iu7abub1p4/29507934445.pdf
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/7c2cad70e18870ca50d3408e87f87643/65389318085.pdf
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/smok7qd3fbbieu8l6q89b2odl3/5907448465.pdf
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/160951a126e1e3---64314520743.pdf
    • https://finances-canada.com/wp-content/plugins/super-forms/uploads/php/files/6c13fc52a2467ebbf5a1a04b98e77836/86838475771.pdf
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/h2puh2e34ibcostlrvk2pk7v07/75988663775.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_off0001039f.bin
69787f52d665bfb4e260720d8345559e79542569bbbbe784c474407a36cfee69
pdf-font-stream PDF embedded font (sfnt) at offset 0x1039F 16624 bytes
font_01_sfnt_off00012f04.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12F04 16792 bytes
font_02_sfnt_off0001471b.bin
d057fadc94a69589bdfc797e1aa9d85e0dfe3971aaf7f0e03da4246976190d13
pdf-font-stream PDF embedded font (sfnt) at offset 0x1471B 10684 bytes