Malicious PDF — malware analysis report

Static analysis result for SHA-256 a665a5be9c0ea8c8…

MALICIOUS

PDF

98.0 KB Created: 2021-06-26 00:41:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 33febde7aaa15044b5f40350ec648f7b SHA-1: c5c6a33c7273d7136d2c021b7dac75675fb6850e SHA-256: a665a5be9c0ea8c8d3adc4684b52c2d9d32b7b9b0bc586a21649358472b11d73
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised WordPress uploads and disposable hosting sites. The primary purpose appears to be directing users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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 https://nomylo.ru/uplcv?utm_term=the+two+major+atmospheric+gases+that+absorb+energy+from+the+sun+are
    • https://mtmnetwork.net/uploadEditor/files/pajexu.pdf
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160892a44424bd---37460486221.pdf
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/c5e985d49333c9b5ef8acc92b17ee3f3/mubesosinosuben.pdf
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c355537beb3---xokonaditomanomejawumezox.pdf
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607508b1e8399---mofokipeju.pdf
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160b06bb7bedbe---51337912885.pdf
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/100d5a96b4bc365ea7a4d1708e7e55b0/xetunobakonopodudoxulemi.pdf
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd5c1ed50f---713241958.pdf
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/2rv5ccf4jjq3n6uuq6rqk1k5ge/tasapepujari.pdf
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a62876813cc---95466299729.pdf
    • https://soltendance.com/stockages/files/fisutewuvatanuxewogopa.pdf
    • https://www.makathastaliklari.net/wp-content/plugins/formcraft/file-upload/server/content/files/160842b3d5fd65---81507697873.pdf
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/motativosapowobini.pdf
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7712e7910c---18906959502.pdf
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/3cbdbe98737402a7d30a5c8ec738aa01/52767963692.pdf
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/16070ad1aed5fa---limurakijexo.pdf
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160984c7b88ce2---nobeno.pdf
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca5cc9cbd7---91646676822.pdf
    • https://whiteelephant.co.in/wp-content/plugins/super-forms/uploads/php/files/0f64eb504c9cb91f1b4dc1334abca004/golubopesasutas.pdf
    • http://aahsclassof1978.com/clients/b/b6/b6117739535924054831d33ecd54b00a/File/xozusowatumexe.pdf
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160749972d0b46---54149019649.pdf
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/a3b1bb4eafa715b71ccbed3432c44b6c/95411548917.pdf
    • https://agrolliance.ca/ckfinder/userfiles/files/pajoloraperasatipikada.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011a3b.bin
4938afd08b607312161d0a52d8adbbb3acfe1cb95b19dd684f61744483e77fb2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A3B 17544 bytes
font_01_sfnt_off00014758.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14758 16792 bytes
font_02_sfnt_off00015f6f.bin
effbd5bd20e67dc55100029244bcdeb1c21e359c57fede8f343e8d76110b4000		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15F6F 11416 bytes

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