Malicious PDF — malware analysis report

Static analysis result for SHA-256 539400e1e18fca5d…

MALICIOUS

PDF

98.9 KB Created: 2021-08-19 15:38:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4c90286386626ae1d4ad44dffbf8d3cf SHA-1: 4efd19d5ef12635ab9325d4e0fe4ad99896a95fd SHA-256: 539400e1e18fca5d73f67ed25cadab0d4f2e38ad8b6f8395e5c409b539835f74
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to manipulate search engine results or lead users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://imhome-listings.com/userfiles/files/larupikejomanix.pdf In PDF document text
    • http://ncdesign.it/userfiles/files/29022131547.pdfIn PDF document text
    • http://wasserentkalkung.at/ckfinder/userfiles/files/5848891836.pdfIn PDF document text
    • http://vetcasatenovo.it/userfiles/files/8987399885.pdfIn PDF document text
    • https://minhvuongthuphap.com/upload/ck/files/tuwagawiwow.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16091d5476ca5e---5553814769.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/a694fcf589b03febbccb460196aa35c7/25370075551.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16090edfaad503---86013722221.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076dcb126606---11718631368.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/xerokum.pdfIn PDF document text
    • http://kperrylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/25612848943.pdfIn PDF document text
    • https://dolphinsolutions.net/ckfinder/userfiles/files/zerediwelebefizewi.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160730c2ebcb23---42394360680.pdfIn PDF document text
    • http://bracyfamilyreunion.com/clients/c/c2/c2db1a97f769835965582c74015c7782/File/rufafoledufi.pdfIn PDF document text
    • http://studiozammuner.eu/userfiles/files/28678349902.pdfIn PDF document text
    • http://www.anapharmata.hu/ckfinder/core/connector/php/files/45711016937.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096849be1ac4---laxiva.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/15a9e35be49fc84d4e5a23c4e9a988c7/14642201270.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/tonepewaxoromawowaloj.pdfIn PDF document text
    • http://k-sta.kr/FileData/ckfinder/files/20210701_73D44A7EB8325057.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f2b6ecdccb---ziluvanuxizoxewufofisumur.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/0923b30feda09ee3937a97b4c8ff8910/14084372393.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=ejercicios+de+movimiento+circular+acelerado+resueltosPDF 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_off000116a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012eb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EB6 19760 bytes
SHA-256: 245e7d5a0fceb73703bb1280dc3ebd2262bee59e1c295ef737f49c5379029f19
font_02_sfnt_off000161d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x161D4 10812 bytes
SHA-256: 018f68f08ca55b48f9c863e9ac742697e12b6ae859d6652372d42f68d29e874a

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