Malicious PDF — malware analysis report

Static analysis result for SHA-256 325973e0eb69e7a5…

MALICIOUS

PDF

77.3 KB Created: 2021-06-27 21:45:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bd67e5c64cbe5469f2424d8c40fcd882 SHA-1: b1cf65c095073f6f80f704edfb7c895d539f822b SHA-256: 325973e0eb69e7a577f0677a410ccdc4ef94c3dae8f5a8838ab3a11c7ec6e22b
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The presence of multiple distinct hosts hosting PDF files within form upload plugins further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160731a983ac65---zitegilupuwumakag.pdf
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/7518584acb48f131c78d9e6cc435d136/39438335632.pdf
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/vd36s7dqihbvgrhqn8kh4amcmo/1915529319.pdf
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16092a3015dbb4---69943010956.pdf
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16078ee7d06d13---41435790032.pdf
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1637a634e---wokanujo.pdf
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/1d4d0c2f3d925f59ac96b2ce484b5252/66834506508.pdf
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adbffab38ce---lodurosalipox.pdf
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/c59f832073278241d302a1cbd1c36164/4690046978.pdf
    • https://lasanisports.com/files/tobazupipivekunuzuxibum.pdf
    • https://gotoko.com/cmsv2/upload/files/zivala.pdf
    • http://rld-carbon.ru/file/pumobufale.pdf
    • http://toptoptraining.ru/img/upload/file/taxemerobotitaboleju.pdf
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/60752368487.pdf
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5edc8bab2---tuxazu.pdf
    • http://www.greenbriarpropmgmt.com/wp-content/plugins/super-forms/uploads/php/files/1116cd4623450d41e02a936955219a63/buwavule.pdf
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/fntkicc0vj88i31m85vubd0gj1/lusovikobisokazefuv.pdf
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d0692f02acb---60437459003.pdf
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2e02ece926---turexalaniratuvadago.pdf
    • http://eau-msu.ru/ckfinder/userfiles/files/35537551489.pdf
    • http://pcccphucvinh.com/upload/files/pefikenigorimilefejekore.pdf
    • https://masterjobintl.com/ckfinder/userfiles/files/wadipamugapejunibebutotuw.pdf
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a945c729644---23360618957.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=meaning+behind+colors
    • 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_off0000ca88.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCA88 16792 bytes
font_01_sfnt_off0000e29a.bin
d0613879138a72979c930eaa92df0cb9ac882ebce10b994dba95b537faa45573
pdf-font-stream PDF embedded font (sfnt) at offset 0xE29A 18104 bytes
font_02_sfnt_off00011034.bin
005a34653a92f0fe7ded56416acb5a6633bd5f5d29e7582bec4150d5a929aa19
pdf-font-stream PDF embedded font (sfnt) at offset 0x11034 10684 bytes