Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffb68ea7bd1dc776…

MALICIOUS

PDF

85.9 KB Created: 2021-09-05 22:47:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 57a7564cfc682900814cb02bcfbf9f95 SHA-1: 1ff6caf2b3308ae7d32f702f3f7f90df70a11acc SHA-256: ffb68ea7bd1dc7769ee8212d1a1e2a8031191e2e4741c4b83be144528bd19628
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, indicating an attempt to execute malicious code upon opening. It also features a link farm with numerous URLs, many hosted on compromised CMS uploads, designed to redirect users to potentially malicious sites. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier clean score 0.1831

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.
  • 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
  • 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://catamma.ru/uplcv?utm_term=blockchain+basics+book+pdf PDF link annotation
    • http://softwarefactory.nl/images/file/15206581079.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/85b2ebcea3a68a9a8bcc43a2a9c885b3/37527731660.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/rovinowivelefomijoz.pdfIn PDF document text
    • http://traiteur-ribot.fr/userfiles/file/19377795335.pdfIn PDF document text
    • http://regalmotors-jp.com/js/upload/files/45449328763.pdfIn PDF document text
    • http://hydrem.ru/images/file/kawodikipakemabu.pdfIn PDF document text
    • http://yenidenyuzlendirme.com/ckfinder/userfiles/files/zejosukedabodomip.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/ead199064ed1480d725d978883f9202a/99079870641.pdfIn PDF document text
    • https://bangprice.combangprice.com/beta/cms_image/file/wirefij.pdfIn PDF document text
    • http://recrute.fr/files/files/76817479918.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160f56e518c3f3---dumugixilobaz.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/7747c5ec7b1a30c5e1204a81f63b2230/nosipegimozarisegu.pdfIn PDF document text
    • https://atphp.ch/userfiles/file/60914332598.pdfIn PDF document text
    • https://nisahanpin.com/calisma2/files/uploads/784725832.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c2cc7c8d25c---28532282992.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/2c4734f123941af8375c64feac3288dd/kigikatolalipepi.pdfIn PDF document text
    • http://mnarch.it/userfiles/files/31525693617.pdfIn PDF document text
    • http://mobilni-kadernictvi.cz/files/file/sinoxab.pdfIn PDF document text
    • https://hasekei.jp/userfiles/file/tovoramelimijuso.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160724771dbd91---15150596564.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609441b46b7d1---98445579471.pdfIn PDF document text
    • http://www.kymkarajok.net/tiedostot/files/28674867232.pdfIn PDF document text
    • https://ytdrive.com/CKEdit/upload/files/xaboxijiviferinuvojurafim.pdfIn PDF document text
    • http://xn--k1akb4c.xn--p1ai/userfiles/file/32583342509.pdfIn PDF document text
    • http://psychologkmalinowska.pl/ckfinder/userfiles/files/91056847330.pdfIn PDF document text
    • http://s292376414.onlinehome.fr/datas/imgmail/file/4486134041.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001215c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1215C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013973.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13973 10672 bytes
SHA-256: 6900d233fc29f3e40ab540ae9ec77e3702e9c9afc47658df310193c0e0c4d76e