Malicious PDF — malware analysis report

Static analysis result for SHA-256 a89d227713b9e581…

MALICIOUS

PDF

89.2 KB Created: 2021-08-11 07:45:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c96c3aa8d9bf8f7d7a48b52b0b019d93 SHA-1: 031ec4b8cbca6da56470587893319dd4562024c8 SHA-256: a89d227713b9e58189589e790aa1e2f0ccbb7ad06df0a15a159f847c4d564cd4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains a link farm with numerous external URIs, many pointing to compromised WordPress upload directories or disposable hosting. The document body is heavily obfuscated and unreadable, suggesting it is designed to obscure its malicious intent. The presence of multiple links to potentially malicious sites indicates an attempt to redirect users to phishing or malware-hosting pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://vyveva.eu/UserFiles/File/66541547397.pdf In PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16078237883aa7---27282701654.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/80467513de5ec513a068d3975701a38b/23768925899.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/1608d783f89e82---16107220520.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e113697511f---babemofesejiwivowafabalu.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a1851e9a7d1044ef8b2d5099fecb448d/kipinipalomopejenifexupez.pdfIn PDF document text
    • https://thinkglobalcompliance.com/ckfinder/userfiles/files/buxugimomadisixi.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160877c2f7e807---bapirawewoxezakemorajemi.pdfIn PDF document text
    • http://tokstar.com/_UploadFile/Images/file/38348882903.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b63fa73fbfd---gujiwav.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/f2434ff62e2ee94012d3f3b7d8664f70/zezenagobixapadobetixezup.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075ec1608d2d---texudo.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070694a61a71---wafitowabadew.pdfIn PDF document text
    • http://stardentalcare.org/userfiles/file/2603199700.pdfIn PDF document text
    • http://tfh-filter.hu/_user/file/60485243248.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/1e4ba5a0067d9a6fbe838c809b4b14fb/4035629142.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/62855f02e213a1e91a6d947a4ca8d423/95168431305.pdfIn PDF document text
    • https://cfbadalona.net/ckdata/files/labebidulaparolav.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/0559966b8bf0c7725a100ee1489abcd9/paberet.pdfIn PDF document text
    • https://groupunsur2.com/contents//files/rovemesexizadizizodu.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e2665c07d7---81231203054.pdfIn PDF document text
    • http://bigband-ulm.de/userfiles/files/wutuseku.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=paquete+desconocido+mi+tiempo+en+portland+oregonPDF 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_off0000f6e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E5 11104 bytes
SHA-256: 355d28a379d1b7bc444bdbea902c0315c112171e75d81e9ad768c87c82797dd9
font_01_sfnt_off0001103b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1103B 17636 bytes
SHA-256: 9f1865655fd113c1193af921d35e9afd35650d294e42335a016f4131df3fa80c
font_02_sfnt_off00013d6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D6D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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