Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0b6fe6f24c4780a…

MALICIOUS

PDF

86.5 KB Created: 2021-09-09 16:07:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a5afb1edff6f11cad915e5df852e66b4 SHA-1: 9366002ac07fd996cb9f15f59c5020d47ba3e85a SHA-256: d0b6fe6f24c4780ae718a28e60bf73d3d7f7d14c8fb35736dad0fe84634a1b1b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/df9la6qbsic9njngq8olnee6pf/zuxomakokod.pdf
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613944cad5cff---rodiginujegefunedupizuvif.pdf
    • http://cetis156.neutronds.com/assets/js/ckfinder/userfiles/files/dunobixusonujalolixaniga.pdf
    • https://vinaarc.com/app/webroot/files/ckfinder/userfiles/files/dorobuvumupo.pdf
    • http://jurabos.nl/include/editor/file/jarufataxeranexivijo.pdf
    • http://pvvc.cz/files/45944344840.pdf
    • http://kbfrutos.sk/images/_file/gijadivakipewosile.pdf
    • http://my-hustle.net/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/teselovuxenepidirire.pdf
    • https://baoyi-chuck.com/ckfinder/userfiles/files/88347202175.pdf
    • http://studiovalentini.eu/userfiles/files/26021706901.pdf
    • http://imhyuk.com/imhyukeditor/userfile/file/70577892672.pdf
    • http://immobiliareborghi.com/userfiles/files/14154077950.pdf
    • http://abwplazaview.com/uploads/files/97039020842.pdf
    • http://metalltechnik-kutschi.at/84213070727.pdf
    • http://open.ua/uploads/ckeditor/files/dubeporojarerigeji.pdf
    • http://ipublicity.cz/data/file/runuxowax.pdf
    • http://yonezawanet.jp/units/24250/zcycom/files/10924560500.pdf
    • https://inprovitargentina.com/ckfinder/userfiles/files/sowunole.pdf
    • https://tasivn.com/upload/ck/files/gugebofekenememadolasowop.pdf
    • https://urbanlivin.lu/userfiles/files/tadojedanafobimefe.pdf
    • http://xn----7sbbgprpk7biiq.xn--p1ai/admin/ckfinder/userfiles/files/nasivijenewagipuxedemuv.pdf
    • http://z-him.ru/userfiles/file/nanotojedaparo.pdf
    • http://robwalker.net/fckupload/file/kabapefanikivopop.pdf
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/49122122035bd2d831a3b043a4a3d9f8/30085402850.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=2+balls+3d
    • 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_off0000f057.bin
17c7f0e408b5e04a18325073a145482fa01f619c724f8e517e9fe3fa1eb0ed64
pdf-font-stream PDF embedded font (sfnt) at offset 0xF057 9928 bytes
font_01_sfnt_off00010668.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10668 16792 bytes
font_02_sfnt_off00011e7a.bin
adb133bb54b3c306f9ab22199195a468764e000fc59b0caaf6d26a0e053c765f
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E7A 17872 bytes