Malicious PDF — malware analysis report

Static analysis result for SHA-256 89f3f2b3fc1e81cd…

MALICIOUS

PDF

74.3 KB Created: 2021-07-01 22:08:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d7d15d45172e79de9a46fa46063e958c SHA-1: b191f07987c8bd92a26eb48df1c7bd7d291b0bb7 SHA-256: 89f3f2b3fc1e81cd227a1c330c817ac3e2d762ff303d346af69e521e90b25df1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the PDF structure itself is indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://am-assets.com/aom/magnolia/userfiles/file/84017513675.pdf
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c20a7a12f4e---24346221506.pdf
    • https://asharfilalkulfi.com/ckfinder/userfiles/files/mizupim.pdf
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/e8e00eda34b5c4e309147d3c224a9c52/8664144105.pdf
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/5aef641939abdda3b777687955be46af/wopizowevofowonanirowubav.pdf
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/rcpnppd3v6fqdi8rmv2oaebil1/80456743385.pdf
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/9bf11b2f3c4e9d63acd086cbee9efa3f/24602159083.pdf
    • http://beergolfers.com/blog/images/file/60467453944.pdf
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1609463f15b0a2---29106955067.pdf
    • http://resetimpianti.it/reset/public/file/18756853365.pdf
    • http://sgyscom.com/upload_fck/file/2021-6-10/20210610235723188807.pdf
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/9mp5j46vj2qm7ivm9qhhesgtuo/92885762004.pdf
    • http://birnagarcollege.in/userfiles/file/50543185614.pdf
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160706d57c7669---vosexip.pdf
    • http://greenplanetnepal.com/userfiles/file/nuziremitegosanufomopajaw.pdf
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f490b7c7e---jivovazapexu.pdf
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607720eb80721---36864164332.pdf
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/83fc8d0f121418e64ff5f2a78e0facf3/gutadov.pdf
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b2181c3e102---jerejuro.pdf
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a6bf65bf72c---85040265162.pdf
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160945cb1694ce---16533490816.pdf
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/134c0fa415fd003c6004bde9c2928825/talonakazerasezuxik.pdf
    • http://staractivecollection.com/resimler/site/files/bilulufukibeka.pdf
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/at816lokq4e0cfiv9piiqs6ik4/25085032226.pdf
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a33a644783f---subedilarifototulew.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=cheap+car+with+sunroof
    • 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_off0000c08e.bin
b4c4cdffdb04ae200879830d8df436b5cff3fed7f0bb94bceb6e4cc8a280cbc4
pdf-font-stream PDF embedded font (sfnt) at offset 0xC08E 16436 bytes
font_01_sfnt_off0000eb1e.bin
5b6d304ceaaab5ae00a07e6acfd1b211d2ea11c65108c0390b012eceb8147267
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB1E 10748 bytes
font_02_sfnt_off000103f0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x103F0 16792 bytes