Malicious PDF — malware analysis report

Static analysis result for SHA-256 7af3bb351d531611…

MALICIOUS

PDF

94.9 KB Created: 2021-07-03 09:08:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 9289b88b5d06c57333e0a0e1ab3beeda SHA-1: 3c0a93ebecfb9c15d77dc5ee7d1d7ebea9408e75 SHA-256: 7af3bb351d53161127c04efbfa42c048bea9ecff4995b77e030123921cafa884
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious content. The PDF structure and embedded links are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://irlanc.ru/uplcv?utm_term=brothers+grimm+terry+gilliam PDF link annotation
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/fa083edb7f3817e2b15db9b97210ace1/13640982191.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607370703a68f---vusefazip.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070f1d48d5b5---17231002214.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16077713520485---kidixed.pdfIn PDF document text
    • https://inverpalmas.com/aym_image/files/kiferegenemewuluvij.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/359f0754b07fa67cf53c6c01e6facdbd/sesur.pdfIn PDF document text
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/p8vugq9fp7kk5b60dhaungdl9q/toparagejoluxagob.pdfIn PDF document text
    • http://morethancars.nl/uploads/edytor/file/zewinimeledefigeju.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/79b0c64c1af73123ed890ca8fdb6df21/21874567543.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b25aa354b79---napinex.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aaa954cdbb---16322874759.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b8b81040d22---69660053445.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/95504721923.pdfIn PDF document text
    • https://hagepoorter.be/files/files/lufiwu.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/55200138966.pdfIn PDF document text
    • https://ev-owners.jp/userfiles//files/55961883643.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/40fd1df0765ac790dd2123598174edf7/2649214092.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/jinigimivera.pdfIn PDF document text
    • https://investmentskillsgroup.com/images/userfiles/file/bozulujomavaripadejidi.pdfIn PDF document text
    • https://upchealth.net/wp-content/plugins/super-forms/uploads/php/files/dde3d1738eb5338ca1de85cb16c208ea/83067698462.pdfIn PDF document text
    • https://conexkarvan.com/cache/fck_files/file/jasutelofilagupazek.pdfIn PDF document text
    • http://diagnosticaedilizia.com/userfiles/files/xelakojage.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010e9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000126ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126AE 18348 bytes
SHA-256: b60f8e1e18c0ca71c99de4a6a2b0e4d92701117b86c206cd3f1c6edcd2e87e51
font_02_sfnt_off000155eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155EB 10616 bytes
SHA-256: 7aaab081f6616646851ea7a67c63a07c02fcbdf96ca326276e0115a63ad7e82d

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