Malicious PDF — malware analysis report

Static analysis result for SHA-256 decc65b6155f3840…

MALICIOUS

PDF

81.5 KB Created: 2021-07-23 13:56:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 223751e07f44f2fb7c565a62699c3c2c SHA-1: 9dd5bf1bc7caee6da8cbf10f2415a80761a96e88 SHA-256: decc65b6155f38404cf774798c823ae9b9f38b2b08f7491157d766e251966eb6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It functions as a link farm, directing users to multiple compromised websites and disposable hosting domains, likely to distribute further malware or phish for credentials. The presence of numerous external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest a malicious intent to lure victims through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/d5958b6df79c0bc095ee53b9aa7321d6/vulugizo.pdf In PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/62c987f1d861202a2a35ffbb631998a7/69351399301.pdfIn PDF document text
    • http://benly-carson.com/product/files/32569187491.pdfIn PDF document text
    • http://maasmartcity.com/userfiles/file/7608003687.pdfIn PDF document text
    • http://dragonera.cn/admin/userfiles/file/supexibelivilakekusu.pdfIn PDF document text
    • http://komputerzagrosze.pl/userfiles/file/75464235959.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e112ef0b250---vowagimakinikisup.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160aa8a0df005f---kagotiluviduxoguti.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/160841dc33f8a4---poloxilafupitoluberiwez.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160853f7742ee1---zesexuvikozifiludi.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae26a14d26---duretisi.pdfIn PDF document text
    • https://betenagro.com/sites/default/files/file/pepikiwidopekumidep.pdfIn PDF document text
    • https://shindah.com/images/ckeditor_img/files/nodus.pdfIn PDF document text
    • http://2ds-creations.fr/userfiles/file/rerobegotadokabipojob.pdfIn PDF document text
    • https://nhachoxebus.com/upload/fck/file/gerigerelagexokaveje.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bfb0797df2---dujufu.pdfIn PDF document text
    • http://steakclubhn.com/campannas/file/josibadoxufixowibesekun.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160771ddc2dc50---11154841969.pdfIn PDF document text
    • https://vasutaszeneiskola.hu/ckfinder/userfiles/files/pesow.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/26e25c5036bc05f81e00cdc9e7bbc426/92679191652.pdfIn PDF document text
    • http://blbr365.com/userfiles/file/1621244602.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210625202503.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/77873321a6bb708c50b25916ea6c541b/84036943675.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=introduction+to+philosophy+classical+and+contemporary+readings+8th+edition+pdf+downloadPDF 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_off0000d754.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD754 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF66 16928 bytes
SHA-256: e615166c14832f90bfac99c9b7c1b0362af815a32a2e3f94faf6a569a6ec15fb
font_02_sfnt_off00011ba3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BA3 11524 bytes
SHA-256: ee7cac94701b1225c5a22739d35aa09d5e7e8ccf9997ced2992a9f1902688e57

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