Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fd925686a23f94f…

MALICIOUS

PDF

87.1 KB Created: 2021-06-28 11:08:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7b204d32b14512b7afe5cbae36ed22d7 SHA-1: b19a0bbd97446216c58afe4d670f835df27c98bb SHA-256: 4fd925686a23f94f56766555b6a9faecc10261ded9352e2c4364708bfb903e1b
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b76d82cceda---26467151714.pdf
    • http://timandlor.com/userfiles/file/75296954983.pdf
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d1a80d0a15d---89495566782.pdf
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a54fdd4ef7---90079121801.pdf
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/bppdrg9noto7bvl7qk6ptcnekk/15406451976.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/e27e5872c8e5374ace13711dd4010af4/safutifizabanidu.pdf
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b9e4ec95cff---lexudugaxogejawutofibogup.pdf
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/975fc2a19723735609ce027f30e893a8/74997299515.pdf
    • https://posaonakosovu.com/ckfinder/userfiles/files/52561729551.pdf
    • http://dohertylaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dinosetabatelarupin.pdf
    • http://asesorgubernamental.com/images/file/falibuwodosa.pdf
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/9tq7ro3arv8vfv0210p8if7dj5/jepun.pdf
    • https://sandzak.best/wp-content/plugins/super-forms/uploads/php/files/6c221ad5e2b9cfa76107bdcd27ba91eb/68318189368.pdf
    • https://digireg.es/upload/tapemizejonikuxo.pdf
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b22f3bb50ed---97850334491.pdf
    • http://jshtextile.com/UserFiles/file///22533219087.pdf
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160720364e4212---41293185289.pdf
    • http://agcslohian.com/userfiles/file/zelawejirofi.pdf
    • https://xn--faades-mtal-n9a6a.ch/ckfinder/userfiles/files/guxini.pdf
    • http://global-leasing-management.com/uf/file/95423479727.pdf
    • http://kapelski.pl/userfiles/file/92441323325.pdf
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb3ccd91734---lesepigadomeleku.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=portable+network+jammer
    • 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_off0000e84e.bin
960e93ee15ce7cf42175af9fd35afca7e5b02f16d86b023b72821150c7074cf3
pdf-font-stream PDF embedded font (sfnt) at offset 0xE84E 10456 bytes
font_01_sfnt_off0001001d.bin
6df00093d1a1fd8b8f95901b42ba2863538c90606311dd4adf1993a433792d13
pdf-font-stream PDF embedded font (sfnt) at offset 0x1001D 1692 bytes
font_02_sfnt_off00010825.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10825 16792 bytes
font_03_sfnt_off00012037.bin
9fe81c7fd8a3fdfa8caea5008231a25ac75e54bb6d108fa179be68158220d89f
pdf-font-stream PDF embedded font (sfnt) at offset 0x12037 17424 bytes