Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d76a9b6e4951e01…

MALICIOUS

PDF

78.7 KB Created: 2021-08-13 12:13:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: 7f2bc4f7ce96ca255c944145c8fec399 SHA-1: 7c333d0a194ac99ff6f67457e1f5a73d98b16051 SHA-256: 3d76a9b6e4951e01b56b3246579f321b0911aed4998fbc90e9af84b9d8c3e5ca
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many embedded URLs pointing to potentially compromised or disposable hosting. The primary attack pattern involves luring users to external sites via these links, which is consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://zaun-produzent.de/userfiles/file/toponi.pdf In PDF document text
    • https://promise-land.com/upload/file/fifinojijokowesisej.pdfIn PDF document text
    • http://kengosushionlineorder.com/uploads/files/75212161469.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/769b1822936ccd9a1a35e9bbcc6a5d5a/debibiwozewikovoj.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/vitaposejizuwovibozi.pdfIn PDF document text
    • https://filetorme.com/upload/files/39316270417.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/giwer.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///59980626672.pdfIn PDF document text
    • https://evermoral.hk/upload/file/1624831062.pdfIn PDF document text
    • https://cjsc.se/ckfinder/userfiles/files/99830738615.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607a994640bc3---70567184136.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb1b453486c---90276045149.pdfIn PDF document text
    • http://strandedtattoo.net/file/79599397666.pdfIn PDF document text
    • http://billsky.ee/files/file/23714907522.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a95dcdf0afe---66961418188.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-14/20210514180028721663.pdfIn PDF document text
    • http://xlpe.net/Images_upload/files/burodizoxudazade.pdfIn PDF document text
    • http://7onseventh.org/clients/868256/File/monuvusitu.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a46df80e692---81128605426.pdfIn PDF document text
    • http://qdsenfeng.com/data/files/zidamewir.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607e153fbbae0---putinolijazuzedujowozo.pdfIn PDF document text
    • http://c-amc.com/upload/files/48536441747.pdfIn PDF document text
    • http://soflocops.com/clients/67403/File/tamadujofasexosud.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/9492ae55cad02b148a18877a88d1830d/revumoregewubepagopipim.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/9bea44441d198f77534d18ad181cbbc4/mutexudo.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606e96d7795c4---9323442798.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=9.s%C4%B1n%C4%B1f+matematik+denklem+ve+e%C5%9Fitsizlikler+%C3%A7%C3%B6z%C3%BCml%C3%BC+sorular+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_off0000c801.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC801 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e018.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE018 12008 bytes
SHA-256: aed3b45ea26f163f9c8c388a99f31d8a127c8040275592431387ca2182e8b7c2
font_02_sfnt_off0000fb75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB75 18384 bytes
SHA-256: 6cb6c53ad721c5e0112493b18c47f148eabded3e1f831b81657470eb30ab8541

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