Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e8c5f9fb9723ab5…

MALICIOUS

PDF

83.6 KB Created: 2021-08-09 08:57:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ea77258e019fa6fda54401578cbc7070 SHA-1: dd1e1463dc42f67ea761fd17beb358ec6ac53bc0 SHA-256: 8e8c5f9fb9723ab5093aadbf6ab8ebacc08609c6f0939c9c68fefbada4efa872
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting it functions as a link farm to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were extracted, the structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://guides2alpes.fr/uploads/file/49215894038.pdf In PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160984c436a0cd---bitidis.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160876833266a0---pejelaxoxetadimetedug.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/117a9a47d4d7a89b466a6017a14f2308/savewegokidomimor.pdfIn PDF document text
    • http://rosabaum.de/web/editor/files/61114725832.pdfIn PDF document text
    • http://bet-balance.com/userfiles/file/1902160062.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/2068f2c8b2e9f5d15ec0ecf2c89b6951/17848619771.pdfIn PDF document text
    • http://healingpawswisconsin.org/clients/a/a9/a991db820639e3552774ed9a746c1e3b/File/24090955693.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cdb30646686---bawitikuxakijanoz.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd0279170df---42606714150.pdfIn PDF document text
    • http://whuntex.ru/userfiles/file/17195374705.pdfIn PDF document text
    • http://gurukripapublicschool.com/userfiles/file/lugifas.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/3ab7b58eb161ef1c0858a4f1ca0b99c6/76382082790.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/cafdc30f8f03bc6158c26b0a6e371d3f/dixegexekefodapuzikomo.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/19d44fbed7143e36f1e2494d10e4f779/4200025799.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/16071e5608bf07---pamevasajemigikufid.pdfIn PDF document text
    • https://xn--hjrnskadeakademien-mtb.se/userfiles/file/2502699290.pdfIn PDF document text
    • https://aonetreks.com/uploads/file/66945966765.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160744ccc24fcf---bokugalarerufulivedus.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbc03b46995---saxigatigidesurawezinaz.pdfIn PDF document text
    • http://wernitznigg.at/files/dojalipateper.pdfIn PDF document text
    • https://nstyapi.com/resimler/files/gexozinasovanofulafakow.pdfIn PDF document text
    • https://mimpiindahsatu.com/contents//files/19122143369.pdfIn PDF document text
    • https://lensprovn.com/ckfinder/userfiles/files/93695024518.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=important+quotes+from+to+kill+a+mockingbird+chapter+1-11PDF 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_off0000e2c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C6 16256 bytes
SHA-256: 1cee16790c5c6bafd699db7ab01a870d37ef2f88b38083f81be00a3e565d026e
font_01_sfnt_off00010c9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C9A 11580 bytes
SHA-256: 8e486825d9957e724adf622edacd723cbfd3bb141424c5f0dc37f9f93edc77cb
font_02_sfnt_off00012739.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12739 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1