Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd67cd67c40798cc…

MALICIOUS

PDF

76.2 KB Created: 2021-09-05 11:15:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 18fcac4f367ba2d4200798d5e91df04c SHA-1: e12f540ec52cd2738fffb290a93abe1e877bf013 SHA-256: dd67cd67c40798ccc92e0cbd36ffa93e96a8e37e05354963a8f5b35416b74da7
156 Risk Score

Malware Insights

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

The PDF document contains a link farm with numerous URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple links to potentially compromised content suggests an attempt to leverage these sites for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 https://hoangvan.vn/wp-content/uploads/files/76377888333.pdf In PDF document text
    • https://hattoco.vn/images/ckeditor/files/namas.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/td39nmt36gsv24b4vnkfra1ulu/2623576914.pdfIn PDF document text
    • http://www.moyekolodin.com/files/lolul.pdfIn PDF document text
    • http://neoneofitou.com/ckfinder/userfiles/files/vijivexisetavesopuju.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/db4bd243a8ae089c2ada2489a1d51257/30757534889.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076cbcf509f9---tetubugunizabogawakizi.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d25933cfa2---86673326207.pdfIn PDF document text
    • https://www.myosiaffiliate.com/199trust/img/file/81392731807.pdfIn PDF document text
    • https://esz.jp/img/editor/files/tesikazoduxevipi.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/2e9c343e0f5bdfa9ff4f491095d7bb3f/fikodoxoroj.pdfIn PDF document text
    • https://olamare.com/img/uploaded/file/madujawujatu.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/zukukirikavud.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/4f86e1c0762b9b6dde539b2e0d2d47ea/likumuwefiluwe.pdfIn PDF document text
    • http://alphabodysupplements.com/newerac2c/userfiles/file/mexodukuj.pdfIn PDF document text
    • https://charterfori.ir/basefile/charterforiir/files/kedajemekederixazo.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/097250bb3f6e66bbb21ee14446a81393/76107990728.pdfIn PDF document text
    • http://impactpluslearning.com/ckfinder/userfiles/files/xaneferuzuso.pdfIn PDF document text
    • http://telegid.tv/userfiles/files/13094603056.pdfIn PDF document text
    • https://traveletrust.com/basefile/traveletrustcom/files/51778869631.pdfIn PDF document text
    • http://studiotecnicoprato.eu/userfiles/files/9903749843.pdfIn PDF document text
    • http://romento.com/uploaded_files/userfiles/files/21027831485.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=free+worksheet+on+solving+quadratic+equations+by+quadratic+formulaPDF 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_off0000c347.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC347 11644 bytes
SHA-256: 2b6e9db4ab3c31899150b1630a9d30caed0b13a45b0d0fa9eca703d18e24b463
font_01_sfnt_off0000de5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE5E 17356 bytes
SHA-256: 735ac9e6415f3234da4b941eff6522c9d89fd68eba3224d630c19d99efeb39a9
font_02_sfnt_off00010ae4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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