Malicious PDF — malware analysis report

Static analysis result for SHA-256 1660a348ce51edd6…

MALICIOUS

PDF

85.9 KB Created: 2021-06-27 10:23:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 72c9e92ed0fb82f1abf1d7ac59f9b271 SHA-1: 7ee329274e9c63f7f279945730f9fb1e3a1f7578 SHA-256: 1660a348ce51edd6c230c5d87caa512059caecf3a9cbf412f34f6a6737e93ae8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The document contains a large number of embedded links, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. While no scripts were explicitly extracted, the presence of PDF-specific heuristics and the nature of the embedded links indicate a likely attempt to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16088a5f38f0db---97208975258.pdf
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8c2a76a3df---83769955726.pdf
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/rfcv8b1ltckmo2i9v6pnn7itq7/64828002754.pdf
    • http://naszymsladem.pl/upload/file/domumixusolin.pdf
    • https://toskov-yordanov.com/userfiles/file/63742266923.pdf
    • https://mayurherbal.com/userfiles/file/vujuxosutirukewurek.pdf
    • http://caphegiabao.com/upload/fck/file/pupojawu.pdf
    • http://bigpictureresources.com/userfilesbigpicture/file/28396751876.pdf
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/59ea17f0be11fee56e287837c2870579/gutevakarivofogesojenazi.pdf
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a80d6c6622e---12648001387.pdf
    • http://oilmachineydy.com/d/files/wuvuvamiwupobefufopam.pdf
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afbfa6a1781---zokewidopoxovutatidekim.pdf
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/68vemc12s51ke4dsssd0vllvvi/bapozisazuzeniniku.pdf
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//53325816020.pdf
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/b4o42b5eavpqv9n1n99trk2v1l/27058266222.pdf
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ebdf58763c---76668868958.pdf
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7b5d617e4a---2034587456.pdf
    • https://eternalbliss.net/file/mepadawevuladenaguku.pdf
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160974989e2444---17027789281.pdf
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d2eb2b882c---siraro.pdf
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/1c2eee95b93c71b26d3de5c58e678fea/44310267789.pdf
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609a0b6a9de56---50517658832.pdf
    • https://optimuselearningschool.com/learning/site/images/uploadfiles/13837706635.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=difference+between+8086+and+8088+microprocessor
    • 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_off0000eb1d.bin
962c45a10c9a55fdd91ffcc66ed288d08ad69fb755d188bb68d0cb820f25f129
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB1D 16944 bytes
font_01_sfnt_off00011724.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11724 16792 bytes
font_02_sfnt_off00012f3b.bin
7d753464450b5f4eae9b7c8a0986de4e899b1ce6bd3ad898a4e52b5f54f13ac5
pdf-font-stream PDF embedded font (sfnt) at offset 0x12F3B 11460 bytes