Malicious PDF — malware analysis report

Static analysis result for SHA-256 d89915ebf4d6da6b…

MALICIOUS

PDF

81.8 KB Created: 2021-06-29 00:07:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 380fc0f6c60c16561cf33f819a4d4199 SHA-1: 7fdb570ea9c6a05415ae1e0cd1fb02d5e2bcb75b SHA-256: d89915ebf4d6da6b746c024c02d53d47746ff63d6e0b233d1daebb2f9389c9fa
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. Additionally, numerous URLs point to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious or phishing content. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a09e51e8020---14221865130.pdf
    • http://termocity.by/pics/files/nubaneripukowudumujo.pdf
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/4c1b28864d285984b7dd182984404897/ninakuxivosojusot.pdf
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/f50651a362dcb766a5e977f086b86f03/mepuzosaw.pdf
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac53616cee5---15238162077.pdf
    • http://zovsh.com/Uploadfiles/files/dovogupojerupu.pdf
    • http://lacasedescaraibes.fr/file/kejaxaki.pdf
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609405f008286---6093589600.pdf
    • http://ttlh.vn/storage/ckfinder/files/tefivisi.pdf
    • http://1137.jp/app/webroot/js/ckfinder/userfiles/files/dunofaxisekataxuxa.pdf
    • https://bhsbeacon.com/FCKeditor/file/xezudi.pdf
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a02dd7daf77---79227099099.pdf
    • http://hamdard.com/hamdard/app/webroot/img/ckfinder/userfiles/files/98144773851.pdf
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/602c94e410585ed06085a7c7af70fd5f/4748405503.pdf
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/81f62e5b4d89af4202caa62c3a7ddfa8/66926039565.pdf
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/efa3647ac2e8664c2566eef78e5fe2a7/wesena.pdf
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/bf9e1955c6030e49f77912377ace794a/wapenupiwanewajurololel.pdf
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b7f3d72385f---34939138768.pdf
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160857c7e16c40---73868466008.pdf
    • https://cleaner.pl/userfiles/file/48716110477.pdf
    • https://discovercefalu.it/_data/images/file/pigenisatenuzixemuta.pdf
    • http://parvazyab.net/basefile/api203/files/86080418870.pdf
    • https://catequesisnavarra.org/guiarte_userfiles/files/87004532255.pdf
    • http://bishnutoursandtravels.in/userfiles/file/49609082521.pdf
    • https://vokalensemble-vocembalo.ch/userfiles/file/9108489504.pdf
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609878c815772---63256616651.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=sodium+hydroxide+and+calcium+hydroxide
    • 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_off0000dd32.bin
08923a99e313d4cf9ef0c3511dd6154b1a76bb69f0f003aef433ded29acddc5c
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD32 10760 bytes
font_01_sfnt_off0000f5bb.bin
bdb6e359d6d54e0c1913802ea162f8f52f843062624af138fcb814cebe05e578
pdf-font-stream PDF embedded font (sfnt) at offset 0xF5BB 16848 bytes
font_02_sfnt_off00012190.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12190 16792 bytes