Malicious PDF — malware analysis report

Static analysis result for SHA-256 075443fcf9bbc37a…

MALICIOUS

PDF

80.7 KB Created: 2021-07-09 02:47:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1d685719bf947933cc6db5f1b81dff96 SHA-1: 7273b01c20bc7538b0c67f4a44e0235d626596de SHA-256: 075443fcf9bbc37a62b603a7e358c46a26a08772c0bfc2198e2145c1e8457b26
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate maliciousness. The PDF contains numerous links to compromised WordPress sites, suggesting a link farm for SEO poisoning or phishing. While no scripts were explicitly extracted, the PDF structure and link farm indicate an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/ogv4fsi6n18crucgb4se3lb1ct/tofunugegupij.pdf
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ac546a35917---seraretumiponuwuk.pdf
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/f6026cd4c206452196dfb8fe6e584ace/64984105298.pdf
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/3c858b6409d2f71f106f3765243047d0/81616777124.pdf
    • http://bahtiyardishekimi.com/fckfiles/file/92039815816.pdf
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9ac209ba05---98239420304.pdf
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/e2b7e0ad3c30f2bfeaaba0e64b2bb029/36540245294.pdf
    • http://jfkanacon.org/data/userfiles/files/89090327507.pdf
    • https://alihuata.com/userfiles/file/wopigiforitagizu.pdf
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b5fae52e496---bemujakumokudatixov.pdf
    • http://restravel.ru/ckfinder/userfiles/files/rufiresijox.pdf
    • https://djennebeads.com/nbloom/fckuploads/file/37090792020.pdf
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/podapokezuxuvimivanokez.pdf
    • http://oletrans.sk/editor_uploads/files/78959273378.pdf
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160ab7694a2506---35853330362.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/4p33vvq7oihm3u53017qgksnv9/zikusojijirapimeko.pdf
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092692a5708c---kibitapazezexov.pdf
    • https://alnahamgroup.com/userfiles/file/meval.pdf
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cea146f379f---pugul.pdf
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608542af154ce---91329204850.pdf
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/accf8bd9259c4fdca2759acd0f835d87/vupudofonobupusobofik.pdf
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160792fa37f361---jovirenaruf.pdf
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/03e67b8328a0d1379e68867413b5b39d/34877080799.pdf
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/5fa1b2be821a400120f8f250e8a2e9c2/wejepal.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=watch+gifted+hands
    • 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_off0000d61f.bin
349795e9e42fddc3469e2b99a2efd5708822224257b5c7e84d512b02d934b804
pdf-font-stream PDF embedded font (sfnt) at offset 0xD61F 17496 bytes
font_01_sfnt_off00010464.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10464 16792 bytes
font_02_sfnt_off00011c7b.bin
c88bc86c7a7c5d2eca9dfffeb00a657be7c16b45b087576db34acbdbd5f41918
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C7B 10484 bytes