Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3567cb70f25aab6…

MALICIOUS

PDF

82.5 KB Created: 2021-09-16 16:47:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c9f066f23dd5def2083111aad40020ec SHA-1: 908ea7c5102de5a41be1d7e966e44ae21c74a0e6 SHA-256: c3567cb70f25aab6799e1f53ef2571696f7510c8c0a11e60c8f2ea3659cd6864
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to various websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://geometracosentino.com/userfiles/files/silobarusiwunagubux.pdf In PDF document text
    • http://paillasse.hu/userfiles/file/45711226691.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/37ba9800d44041a05a162f3e6cf76d45/poxexixovokagodumazulizu.pdfIn PDF document text
    • http://strandedtattoo.info/file/walogikorinesalat.pdfIn PDF document text
    • http://ceresasrl.it/userfiles/files/nomize.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7a289f5f3---77866979640.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/cba64d492d35340f6ca2354769c7ab2c/63046900835.pdfIn PDF document text
    • http://ghinelliarchitettura.it/userfiles/files/tolakebovekuvajejafegetol.pdfIn PDF document text
    • https://tahitotfaluovodak.hu/ckfinder/userfiles/files/37797193434.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/161419c1cd4669---55046381670.pdfIn PDF document text
    • https://smartcirclegroup.com/userfiles/file/39350167947.pdfIn PDF document text
    • http://trieuduong.com/images/Download/22336274476.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/19b841d19cee9a5251177bfa51768a23/bixusudod.pdfIn PDF document text
    • http://neoneophytou.com/ckfinder/userfiles/files/11293966808.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/230bfa21aa5c855cfc3248fb3cce94d7/fopobinepefuz.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614072f9609ab---sazadedepenegu.pdfIn PDF document text
    • https://pensiuneavalentina.ro/app/webroot/file/fasuboxapagodubofunekas.pdfIn PDF document text
    • http://rqconsultores.com/userfiles/file/juziz.pdfIn PDF document text
    • http://globalsublimation.net/uploadfile/files/folifudevizizeridavosesuz.pdfIn PDF document text
    • http://farmina.ru/uploads/files/pegapimivujosere.pdfIn PDF document text
    • http://videlec.be/ressource/file/48755074954.pdfIn PDF document text
    • http://a2hgghk.handylover.com/upload/files/58681815825.pdfIn PDF document text
    • https://producedepot.us/userfiles/files/nukisubodoruka.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/16133413661809---wifavabovomipad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=kurt+cobain+rivers+cuomoPDF 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_off0000dd5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD5C 10644 bytes
SHA-256: 10ba2215bc6da770a1d5198cd941af97acbbad32912440c0bc37e1e2fbb0e6cf
font_01_sfnt_off0000f5c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C7 18248 bytes
SHA-256: 4acd928bd928a6ba80088b31c131e3fe538d9aec1f50f2f271ab525e08e7bd7c
font_02_sfnt_off00012492.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12492 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1