Malicious PDF — malware analysis report

Static analysis result for SHA-256 66c9e3908eebeb0b…

MALICIOUS

PDF

78.1 KB Created: 2021-09-11 12:59:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1bc58075645c3d6b720da2acdd34dbef SHA-1: df01d896d1478ddd7306d36875ab2c27c681d15f SHA-256: 66c9e3908eebeb0bd3a7cb71c863fbc77605a39e2dd123fa6f82a1dc90a02938
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and exhibits characteristics of a phishing or malware distribution lure. It contains embedded JavaScript and a link farm pointing to multiple distinct hosts, some of which are associated with compromised CMS uploads. The primary purpose appears to be redirecting users to external sites, likely to deliver a second-stage payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3607

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 http://www.propper-droppers.nl/files/file/52813991323.pdf In PDF document text
    • http://www.ktgroup.co.uk/ckfinder/userfiles/files/xabenuwurolibamosurila.pdfIn PDF document text
    • http://www.dkmodels.net/ckfinder/userfiles/files/vutavegarafevugutibeluv.pdfIn PDF document text
    • http://heibldr.hu/FCKfeltoltott/file/93812824009.pdfIn PDF document text
    • http://dlastudenta.org/Upload/file/69510637409.pdfIn PDF document text
    • http://rainternacional.com/userfiles/file/liromelor.pdfIn PDF document text
    • https://literie-depot.fr/UserFiles/file/lirikede.pdfIn PDF document text
    • http://123dvere.sk/files/file/31748558869.pdfIn PDF document text
    • https://bakotech.at/uploads/ckeditor/files/62424461024.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613147947749f---28954235661.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/161352ba5bec1e---wekegodapuwisuxan.pdfIn PDF document text
    • http://designpavelzapletal.cz/files/file/41658680826.pdfIn PDF document text
    • http://texmet.pl/userimages/file/35860410998.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613b64300f186---lekemegevebawanopawasoba.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c4b241965f---8643968202.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/jvsvj47l1vdd2ui5hdlgaqm4s0/bodofexovapukukenifopa.pdfIn PDF document text
    • https://moraure.net/js/ckfinder/userfiles/files/6625175139.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/161354676f092c---kezevutikamumedon.pdfIn PDF document text
    • http://antichigelsi.it/userfiles/files/sokarijijaxoruge.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161319c1f696c1---benujabudepafabifej.pdfIn PDF document text
    • http://ipost.mn/ckfinder/userfiles/files/somaketivodinawol.pdfIn PDF document text
    • https://akonis.ch/userfiles/files/vezagisogaj.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a86144db07---vonikitinixazarerafizeme.pdfIn PDF document text
    • http://tetrafluoro.com/upload/files/tepefekagugejas.pdfIn PDF document text
    • http://hrdiborice.cz/erucom1/files/files/seronusukize.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=instagram+profile+visits+2020PDF link annotation
    • 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_off0000d94c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD94C 18464 bytes
SHA-256: 314f692c9f0ce813fab618090fdb8068f221f713d2e4911a18e752a1194a3029
font_01_sfnt_off00010940.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10940 10960 bytes
SHA-256: fb2685f79c344de25e0b62f3c41119a89b05a5b564077367c8a395dd50648d1a
font_02_sfnt_off000122b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1