Malicious PDF — malware analysis report

Static analysis result for SHA-256 07fa9de5099d8139…

MALICIOUS

PDF

94.6 KB Created: 2021-09-16 13:28:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 5c23d8e4b166c4a93deb82cf35a0e8ea SHA-1: c238c2416185b3b9677d259aa0f8a2cf52fa6480 SHA-256: 07fa9de5099d813920ca6c92f3f5a3410cbeb6c933a185873f7116bbbb392bba
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to compromised WordPress upload directories and disposable hosting domains, indicative of a link farm used for phishing or malware distribution. ClamAV and ML classifiers flagged this file as malicious, specifically as a phishing trojan. The presence of multiple external URIs and link farms suggests an attempt to direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://agedwedfjtj.pretty-match.com/upload/files/61697777402.pdf In PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16142955806b15---sowuratutejijeluvolu.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/8e1477784fcc954428b7c7b2ed9826cd/bubivekufebirulebideteto.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c8906483d9---tebotexipawepomofuxata.pdfIn PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/raxiza.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/161326eedc1cda---20868629032.pdfIn PDF document text
    • https://aymsoft.us/aym_image/files/jipupiw.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/4f7c3b4e5ac78df2f133043433af343d/kexesoko.pdfIn PDF document text
    • https://franciscovalles.comtraining.cl/userfiles/files/83095558361.pdfIn PDF document text
    • http://www.village-gaulois.org/gestion/ckfinder/userfiles/files/84532840461.pdfIn PDF document text
    • https://drddvichitra.com/userfiles/file/xikoxexekosat.pdfIn PDF document text
    • https://actaviaserica.org/board/file/files/fugotawununawizegupi.pdfIn PDF document text
    • http://www.impactit.in/ckfinder/userfiles/files/10187601016.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/161363fe8b8590---17230394487.pdfIn PDF document text
    • http://www.srijonihealinghome.com/fckimages/file/joluritovisujenulotomili.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/66b4b58612ca2f87dcf54dd78fd959c1/84609480605.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/7e477d63d0267a92254cb484c82c8161/nikawokuxotafokete.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/16133e0c693ecb---97813674575.pdfIn PDF document text
    • https://cplastik.net/data/cms/file/mumigenujusirepinuke.pdfIn PDF document text
    • http://nguyenphat.com/public/default/ckeditor/files/keregotubuwofub.pdfIn PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/maxazuxupidokobedepuzo.pdfIn PDF document text
    • https://satellietgroep.nl/userfiles/files/56869593665.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161319784e6ba6---todemivofotadepogixik.pdfIn PDF document text
    • http://onlinetalk.jp/app/webroot/img/fckfiles/file/30707711808.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+make+any+app+split+screenPDF link annotation
    • 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_off00010d8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D8F 10820 bytes
SHA-256: c0700af262755887066302e38722c2c5099a7a63d382f32676fbddb9a3675e60
font_01_sfnt_off00012689.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12689 17568 bytes
SHA-256: eeb1d6c663b80d260fbf7c00712c450b4d7f1a6bdb8861c7854037a4f70d3f19
font_02_sfnt_off0001547d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1547D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1