Malicious PDF — malware analysis report

Static analysis result for SHA-256 e15788f16c24ee2c…

MALICIOUS

PDF

86.0 KB Created: 2021-07-07 22:27:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9a0aa38c8d53d8da7db842df11fa1c46 SHA-1: 449a3191c5c09256f9e3d628dd1682551be6e4f2 SHA-256: e15788f16c24ee2c29c135734ceec7c4ea7f5177b8adb66a71dfe24c5ad8458d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, which is a common technique for delivering malicious content. The PDF also features a link farm pointing to compromised WordPress upload storage and other disposable hosting, indicating an attempt to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://unipsyclinic.com/userfiles/file/20210518005252.pdf
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fde2ad7c8c---28918580432.pdf
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/lc471hc9vl4b86d19lif3j4hjg/tenewelunomakotemixigisus.pdf
    • https://biodent.ro/m4fm_files/m4news/ck-uploads-files/43900173531.pdf
    • http://aftckwt.com/uploads/file/dipafirilix.pdf
    • http://spoilersmensgolfclub.com/clients/865201/File/12916941958.pdf
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a79bbefc7a---suwob.pdf
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e5b3286234---tiverokodij.pdf
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/c7ef445c6f502f62c2ebda194eb93f3c/wegejezodomixalurezav.pdf
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607db88c33657---45960850876.pdf
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096a3c79f5e6---zorizisilibuk.pdf
    • http://j1medical.com/uploaded/file/25264789085.pdf
    • http://docando.es/js/ckfinder/userfiles/files/moruvo.pdf
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098871dd66b9---1253710680.pdf
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607814316344f---11206517040.pdf
    • https://dijitalsanat.link/upload/files/23746807371.pdf
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/a76e9cf8103e9badcd774d4a56727072/52233165291.pdf
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16083db38149e2---25634272684.pdf
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c333f62ce3a---7663241194.pdf
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609552b74ea32---17007958713.pdf
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083030fbe6cb---95057131861.pdf
    • http://gongotour.com/FileData/ckfinder/files/20210701_D325FC0CE3391868.pdf
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/096a2cd998b77b17c34e2336f1bbe69f/29753127708.pdf
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160bc82e6892f7---sulekusutafefizarobuv.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=semiconductor+questions+and+answers+pdf+class+12
    • 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_off0000e9e5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E5 16792 bytes
font_01_sfnt_off000101f7.bin
7b4ce960c5fe82aff979fc9d606f33aad9dece6707fdbfc2191bf31dbbe89fba
pdf-font-stream PDF embedded font (sfnt) at offset 0x101F7 17376 bytes
font_02_sfnt_off00012fd3.bin
32d8b7a4bf7bc5e3f78a6e65cccd4f3e5857b84052865051925ce4fccee4a7f4
pdf-font-stream PDF embedded font (sfnt) at offset 0x12FD3 11360 bytes