Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea9762c22a0e05d0…

MALICIOUS

PDF

92.2 KB Created: 2021-07-06 00:01:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a83edb2a58984b1a4851388bf7c2ed83 SHA-1: 167e8d23baed88e70394bd10e42a247ac0d376e8 SHA-256: ea9762c22a0e05d0d26d91ba4f8230c01f8a76543892c1cb051ceb4cde126bd8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://nomylo.ru/uplcv?utm_term=free+ppt+templates+aesthetic
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c1ba4ea4342---37082985729.pdf
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608c27d0dec9b---lomefajuta.pdf
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/0a2a3353966a63d1be89c0109f9df3f2/jupefudepujob.pdf
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd57c8a0abe---8021942463.pdf
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607926a597105---rarexe.pdf
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8ad681047c---56244365866.pdf
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/kl1ua1l0p0rr67umn0l14qjb4l/kenevido.pdf
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/2dc4608c88067da728d2cbd008b7014d/51078943664.pdf
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b80633c4a1c---20184130565.pdf
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160738afdcc143---mowimirevivizev.pdf
    • http://absolutelyneon.com/userfiles/file/sofuv.pdf
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/t2b9ohg8vqds99qekv28jldet3/favizoderegofudusarol.pdf
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/a9f8r0dckr272gile1i0lk94uv/43730171270.pdf
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/u0q4jeknosui9bvo8rugr0h4sg/vowefonexexewozuwisik.pdf
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/lgcvtd8h5oqupn21095795j263/73472991017.pdf
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/hu9ci4psoso23fkl5pb8ug2n00/75533584389.pdf
    • http://www.petercar0937494634.com/upload/img/files/1520368718.pdf
    • https://ubranni.com/uploader/files/88103559743.pdf
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/oobclk1742ur8garheojjh1r51/14840216375.pdf
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079451d6047f---60856973011.pdf
    • https://asiajitutop.com/contents//files/67133446665.pdf
    • http://bacvietexpress.com/upload/userfiles/files/kexusoletetamomum.pdf
    • https://mujeresenmovimientoplus.com/userfiles/file/4919801469.pdf
    • http://evohome.pl/userfiles/file/38980402889.pdf
    • http://apexnepaltravel.com/userfiles/file/39439522003.pdf
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c755ece631f---kivigipusebo.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_off00010837.bin
45f642b953b90a1774d6bad55a33a0badf999e104ccde7fb3c6eee696ca0723f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10837 10392 bytes
font_01_sfnt_off00011fb1.bin
e36d23efe10c5cd7ac9bdf8c7a2e1fd4d335c20a0131ddecd6b90badd7f7b390		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11FB1 16660 bytes
font_02_sfnt_off00014b37.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14B37 16792 bytes

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