Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ac82aab6e31b55f…

MALICIOUS

PDF

79.6 KB Created: 2021-09-06 15:05:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 729dc067dc21b09673cd1cdb9a0ab908 SHA-1: e7372ffc32b7e40a0d95fe6e770923ddb53c9187 SHA-256: 8ac82aab6e31b55f22a97cfbe9725dce38971b8664b19ec8a0a0d4cc30450e33
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised websites, including one hosted on a compromised WordPress upload directory. The primary purpose appears to be directing users to potentially malicious content or phishing sites.

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://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16121a2de725f1---31803427818.pdf In PDF document text
    • http://tragiaocolamsapa.com/userfiles/image/file/sozexenoxudapiwozogox.pdfIn PDF document text
    • https://laetitiabernard.fr/images/file/fonugizaketukezupetufugub.pdfIn PDF document text
    • http://edins.net/userData/ebizro_board/file/96132948328.pdfIn PDF document text
    • http://universalgroupautos.com/files/others/38666022060.pdfIn PDF document text
    • http://w-f-l.de/user_img/file/jugawibavasezepegelotuw.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160857e8e8f08e---8095715223.pdfIn PDF document text
    • http://chothuexeninhbinh.net/data/dulieu/files/43672989365.pdfIn PDF document text
    • http://www.sec-ollivier-associes.fr/www/upload/file/butem.pdfIn PDF document text
    • https://mn-lawfirm.com/box/userfiles/file/dojebirizezexo.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/c4e38d04edc8134f5aabdcafa02a5612/zitusoweraduxa.pdfIn PDF document text
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/f602c4352af7d904e7da9712a7db62df/datofadidagisa.pdfIn PDF document text
    • http://petra-dario.info/upload/datoteke/sulisikapikimalob.pdfIn PDF document text
    • http://market-oborudovanie.ru/upload/file/68355242367.pdfIn PDF document text
    • http://hoangminhphatkorea.com/webroot/img/files/31441226339.pdfIn PDF document text
    • https://baigiangtoanhoc.com/upload/files/65652280299.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e98358e5f38---53348030945.pdfIn PDF document text
    • http://www.mab-solutions.fr/upload/file/bojuremegutetafawuwefoga.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae822948d49---wiwibemavapukevoj.pdfIn PDF document text
    • https://www.swissfillon.com/wp-content/plugins/super-forms/uploads/php/files/7372e8c34ac93e319630cc3292381907/77438874741.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/v70j467gl1pq2hfo6khbbgjmts/dudoxikejumoxenike.pdfIn PDF document text
    • https://mindspacepsytherapy.com/upload/ckfinder_temp/files/20210526193253.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/50629077792.pdfIn PDF document text
    • http://medicare-darmstadt.de/bilder/UserImages/file/97486439298.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/67425871126.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=hydrodynamic+theory+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_off0000d3f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3F0 17044 bytes
SHA-256: ba370c21f3410c6eac3ccd60c1a32d25d1b6b5d68a0b852543c10b280c2770fe
font_01_sfnt_off0000ffe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000117f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117F9 10776 bytes
SHA-256: 66780a2f710d52173dd1c20550fa145be096a799f2843ce580818d8bd8929ae5