Malicious PDF — malware analysis report

Static analysis result for SHA-256 b11c796beac7de5d…

MALICIOUS

PDF

112.6 KB Created: 2021-08-04 10:01:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cfd3cf80dcde4ad5c6c2fd7e4294fb32 SHA-1: dc7d838f853d3cd7c327b3883354fae18d17260e SHA-256: b11c796beac7de5d00c1d31a8b0df14ff9dfa7f19d8b401ccc2b7262e1b853a3
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 WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://99hospitalitygroup.com/ckfinder/userfiles/files/fomirujuxenavad.pdf In PDF document text
    • http://benedictinoselrosal.org/ckfinder/userfiles/files/91235370528.pdfIn PDF document text
    • http://ersenergy.com/UserFiles/file/nivonuw.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/merosipoxirapomu.pdfIn PDF document text
    • https://veterinarycarefoundation.org/userfiles/file/tarowunumutemenoboti.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16094c21d03215---31729278837.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/3530aefec500a46654dc6df172f2f5e5/67063817163.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607bdcf14606e---59873761232.pdfIn PDF document text
    • http://saothienemb.com/uploads/images/files/jakimujutazojov.pdfIn PDF document text
    • https://alutat.com/data/file/4258286287.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a7b8a6d0e56---75636264585.pdfIn PDF document text
    • http://clintonseniorhighclassof77.com/clients/e/ec/ec6cde7faca09d53f5ba1fe44cd32e38/File/54564742692.pdfIn PDF document text
    • http://cupta.org/userfiles/files/20210801024510.pdfIn PDF document text
    • http://olech-rzeszow.pl/userfiles/file/52360058742.pdfIn PDF document text
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/397770d9c35611c2a0ad2d05f684f523/nevugagaxat.pdfIn PDF document text
    • http://artkulinaria.pl/sites/default/files/file/68942759754.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab38eec4250---63032356164.pdfIn PDF document text
    • https://alsultantrading.ae/userfiles/files/duvolulirikimofewonome.pdfIn PDF document text
    • http://nguyenthaotech.com/upload/files/moxukelij.pdfIn PDF document text
    • https://restavracia02.com/userfiles/file/12175539403.pdfIn PDF document text
    • http://motocams.cz/ckfinder/userfiles/files/73932909590.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f594f0704f---48442726799.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=andrew+culp+dark+deleuze+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_off0001528a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1528A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00016aa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16AA1 10456 bytes
SHA-256: 0901fa56312dfac2c29cb6e117c79db644f3511c589982ffcd1bdefe27d4d1ca
font_02_sfnt_off00018292.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18292 18900 bytes
SHA-256: 1c5771b1b50b92757ae037bfce94b28e85030556c4ad66613ecd434ed3e8ba81

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