Malicious PDF — malware analysis report

Static analysis result for SHA-256 543ccc059e6ada20…

MALICIOUS

PDF

71.3 KB Created: 2021-09-01 01:27:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3f0cd73e770e975d854f6d0c3ebf41c7 SHA-1: 5f304e7e1811666a6b650566cda24e3a99943538 SHA-256: 543ccc059e6ada20b3de84ecf5e91f4612d3b844b40175dca61bdb4ef7879d0f
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users. The presence of external URIs and link farms points towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://seamacros.com/upload/file/5850581297.pdf In PDF document text
    • http://inspiredindianfoundation.org/uploads/putoxilasunelugezoro.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/h2a25su95gldc0vop7i2lpibon/ralozefepiz.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e1201235aff---95799670964.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7b3f5877f3---96910690882.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/1aa577dc0e314d128d821f93e9ec7471/74209572904.pdfIn PDF document text
    • https://nabsangram.com/userfiles/file/kizag.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/sawuxegofolubozipepipura.pdfIn PDF document text
    • https://die-elke.de/cms/elke_page_files/file/jamasanukikenux.pdfIn PDF document text
    • http://bloomx.com/sites/all/sites/bloomx.com/files/jivorirofixafeniwa.pdfIn PDF document text
    • http://matsusushionline.com/uploads/files/24190706337.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/41077668390.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a34c44e4353---zanuwapodakewor.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/09b7c8aeb3031d02c627a55bc1761147/nofexoxujixaxikebafosozo.pdfIn PDF document text
    • http://nhasachthunam.com/upload/files/zavowedofikewexujarikawa.pdfIn PDF document text
    • http://haphadoor.com/upload/files/68298517966.pdfIn PDF document text
    • https://livresdarts.com/ckfinder/userfiles/files/gabofamabowuvomemakamep.pdfIn PDF document text
    • http://knuhpharm.kr/userfiles/file/20210619221533.pdfIn PDF document text
    • https://horizontire.com/userfiles/file/moviju.pdfIn PDF document text
    • http://ahs1968.com/clients/d/dc/dcea35c349c70fb55dca458fc6558ff6/File/34266898417.pdfIn PDF document text
    • http://gfhs1978reunion.com/clients/56625/File/putabokazegolinupo.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfe0558f42b---70959927275.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/dozugojefulezolikapomisa.pdfIn PDF document text
    • http://ingenermarket.ru/userfiles/3040794850.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=math+word+problems+worksheets+pdfPDF 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_off0000b854.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB854 15036 bytes
SHA-256: 481619fa1383227bcfb982ae6962d31796695d3e94ff2536957c776bbec916bc
font_01_sfnt_off0000de68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE68 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f67f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF67F 10880 bytes
SHA-256: 0e3a81494f93a59ce97d391a701b895f583f31b38144f984ad2078bcc86360da

Open this report in the interactive analyzer, or submit your own file for analysis.