Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfe5c91402a753e6…

MALICIOUS

PDF

76.9 KB Created: 2021-09-08 14:32:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1a3be668709f728644c8a0960d8c7646 SHA-1: 3480c0ea88cc0a05205bc6d3f3555ab2de974209 SHA-256: cfe5c91402a753e620a4d698f526a9992b24b8d9773cbb7fd3dd6fd93d8c2321
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. It also features numerous external links, many pointing to compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://hopadive.cz/ckfinder/userfiles/files/lezetasofibuxowuzisalaj.pdf In PDF document text
    • https://petribax.nl/userfiles/file/lologutabubupenow.pdfIn PDF document text
    • http://hkwwta.org/userfiles/rululefowafabupegabimonu.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb784023bf---14340218771.pdfIn PDF document text
    • http://aquatherm-graz.at/files/nivijipetogugeseratat.pdfIn PDF document text
    • http://dbcasagayathottam.org/assets/uploads/cms_images/files/60909050516.pdfIn PDF document text
    • http://ukonlinedirect.com/userfiles/files/navivikipebokuk.pdfIn PDF document text
    • http://tomei4x4.jp/js/upload/files/50698796052.pdfIn PDF document text
    • http://fotografoenricogiampieri.it/userfiles/files/92818789736.pdfIn PDF document text
    • http://ranch.pl/files/file/zonok.pdfIn PDF document text
    • https://fotofidelity.cz/userfiles/file/rurel.pdfIn PDF document text
    • https://senegal4d.com/contents/files/sobetunet.pdfIn PDF document text
    • https://anjingliar2.com/contents/files/badevi.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///91230203137.pdfIn PDF document text
    • http://maynenkhiinverter.com/media/ftp/file/silozifesiwekikelivejases.pdfIn PDF document text
    • https://nacituran.com/userfiles/file/jajofujoxufekiwiwelaluk.pdfIn PDF document text
    • https://virker-ikke.dk/files/sobewoxoxebifaxopuwadilaz.pdfIn PDF document text
    • http://oryginalnedekoracje.pl/userfiles/file/xetekopej.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16137dee7da27c---vagit.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613825468bd09---81738478408.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/mizuriradesevezamu.pdfIn PDF document text
    • http://objets.immoweiss.lu/userfiles/files/tivazufatofug.pdfIn PDF document text
    • http://beccaro.it/userfiles/files/41465345544.pdfIn PDF document text
    • http://combatkuntao.com/ckeditor/ckfinder/userfiles/files/zesifawibamawi.pdfIn PDF document text
    • http://emachn.com/data/attachment/file/gujajot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=vocabulary+games+for+the+classroom+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_off0000c89f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC89F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e0b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B6 11196 bytes
SHA-256: 8553db632020d7d990b5fe093cc23c9e30b477f5bb3748e27fb8e85895d55343
font_02_sfnt_off0000fa96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA96 16772 bytes
SHA-256: 54351d7f0fcfdeb129ac7bcc711d5b6c4b6dd23ec79fcc644cc8cb563eaee0bf

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