Malicious PDF — malware analysis report

Static analysis result for SHA-256 65b3985fe05387c9…

MALICIOUS

PDF

88.0 KB Created: 2021-07-02 03:59:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 86f1a866bcb9ff7feef4ef2ec47339dd SHA-1: dfe0e1fb66d6c097f5064626de372f6398bbbdb8 SHA-256: 65b3985fe05387c9cc3ce0b9963a2a4e6e5746157e608b7ccf84759c52ef674c
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs pointing to compromised WordPress sites and other domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest a phishing or trojan distribution intent. No scripts were extracted, but the primary attack pattern is the distribution of malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://catamma.ru/uplcv?utm_term=drive+ins+in+san+diego PDF link annotation
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c12efed4423---xemopurawixepitelet.pdfIn PDF document text
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/e2bf19280fe4656f7abd5a057966a033/nusofapo.pdfIn PDF document text
    • http://fulepmark.hu/nyebu/fulepmark/userfiles/file/guwejisiderinoxezede.pdfIn PDF document text
    • http://ordineveterinarivenezia.eu/userfiles/files/53439047199.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/sesoworav.pdfIn PDF document text
    • http://salt17.com/userfiles/files/32298514168.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c134359bb35bfebeb77ff151a82dc482/92105142320.pdfIn PDF document text
    • http://daoltrading.com/userData/board/file/fojotaze.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/1bdb0b7e53f952e3c1293defd2e5da4c/45192234467.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/7a381c63ece717b6ecba173d80736a9d/pofulajisilakirofibupanab.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160815abf7c538---97585556672.pdfIn PDF document text
    • https://pousadamarazul.tur.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608999a44c548---64492262251.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c9ea921dbb---32321073740.pdfIn PDF document text
    • http://aisef.org/uploads/userfiles/file/file/70714152649.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/koboraberapewoj.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/bolitupaduja.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607e9fb491c5e---bifapuzadarafagusixo.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/sinuvuvubekujifunosine.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/160756cb5c8851---92751131112.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d391b420434---mojaza.pdfIn PDF document text
    • https://biothiennam.com/media/ftp/file/saximugifoku.pdfIn PDF document text
    • https://confetti-seasons.ru/upload/files/linijowefojinupe.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/d4d811cf12eaa7ff4cd508a27106b2f3/68237968258.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/766c70d56a416fd76fa5ed943d09f8e8/19395486557.pdfIn PDF document text
    • 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_off0000f30d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF30D 10344 bytes
SHA-256: be5a429b6c536c8ffd169d0d3ed5adcbab39b0c41acbd2c61497ad40fdcfe354
font_01_sfnt_off00010a4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A4C 18460 bytes
SHA-256: c2b5ad7784ae7d70691837b87918da344c8983db3a2ecf33a1ef9e2439cc22cb
font_02_sfnt_off00013ae3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AE3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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