Malicious PDF — malware analysis report

Static analysis result for SHA-256 4959ea27b4ffd5f2…

MALICIOUS

PDF

72.6 KB Created: 2021-06-29 10:54:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 326d79a4a01cd0b3b00f3d35f86ecba0 SHA-1: 0ac47bb02aa67c6bc742afc3407270709154e7cc SHA-256: 4959ea27b4ffd5f2f3ca970f4a6f7fa5c8deb60291fe8fedcc6f8cf5fad21336
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to WordPress sites with upload plugins, suggesting a link farm designed to host or distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/ebd2e5f93f76ecd0e533c6227701b883/37206551356.pdf In PDF document text
    • http://fructusartis.com/i/File/zegolelezogijerelada.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b5e57445e35---82871852447.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/vas4qa6lf3i172g1aupn6bsil4/budejolubavoxe.pdfIn PDF document text
    • http://xn--aknmedikal-yub.com/uploads/file/bijadebave.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/16b730e65558f7933545a3d920a12736/60610909028.pdfIn PDF document text
    • http://sethhukumchandschool.com/userfiles/file/20224128989.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d5c63a655f---50784272573.pdfIn PDF document text
    • https://misionesmedellin2030.com/wp-content/plugins/super-forms/uploads/php/files/3n37j4hiec7mq2iljf4muu2rti/20345338721.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/16095b1357b64d---tobuxakanaf.pdfIn PDF document text
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/8536c3fbf3d11416d0357b023fda3e66/89339526671.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160775e3708a2d---pojozoveso.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/70e249367d6e2ee409ebe22828ff54e3/gixizavatuxomikodewi.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0481399d1f---12103847582.pdfIn PDF document text
    • http://shopcloud.cloud//ckfinder/userfiles/files/72873315097.pdfIn PDF document text
    • http://mega.kz/media/upload/files/jerezawuzazaxapubifuj.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/butafafebelegatebalik.pdfIn PDF document text
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a244be6a170---93786707237.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bdbbb75f73---fotutijijak.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095e98565db4---ketutibomerodawu.pdfIn PDF document text
    • https://angkalaris.com/contents//files/tufononaguwapusifar.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609249ffc0ed7---vetewanulogalatodifu.pdfIn PDF document text
    • http://euro520.net/userfiles/file/16239697071759141007.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b10fa67094a---wevopogug.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16079993dd328e---47446043557.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=where+can+i+watch+godzilla+king+of+the+monsters+for+freePDF 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_off0000ba28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA28 11152 bytes
SHA-256: a46a30dc091be62f55f30cd016c2c964389684228f3b057456639254a573b677
font_01_sfnt_off0000d3f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ec07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC07 15668 bytes
SHA-256: d0199d0ee0b768e614dcb4950fce2dee9ed76402fa23a839964582261ce4af0b

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