Malicious PDF — malware analysis report

Static analysis result for SHA-256 076dc385dfcb231c…

MALICIOUS

PDF

85.2 KB Created: 2021-07-15 15:43:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f96fbc8bad488b1be6552a26e471a0d7 SHA-1: b7fb811a0bce426ac7143c663e8232209184b542 SHA-256: 076dc385dfcb231cfadb76080cd6acfab8497ab79e5ca255cefccf461b43ec07
156 Risk Score

Malware Insights

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

The PDF contains a link farm hosted on compromised WordPress upload directories, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is unreadable, but the presence of numerous links to potentially malicious sites points to an attempt to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/16087554c23354---77083304147.pdf In PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1e5d37305---74786113017.pdfIn PDF document text
    • https://isosklo.cz./uploads/87185949275.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f626886fa8---dikitodevibolapatavaniri.pdfIn PDF document text
    • http://beautybybelief.com/admin/images/file/xowunivaromexo.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1cefe47e23---81566350317.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/hagil8r28ht4icis1arsh24lqr/tigufixexojop.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba2a239e8e9---diwebatidifoguguwatuwo.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/d1b7e9f2edfc4a65d5786084cf30a02e/tajodobuta.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088e07cdbb26---gozirokepevaxovazomeser.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096638869533---duxijeze.pdfIn PDF document text
    • http://clubselectionvoyages.com/images/file/76174570265.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160bde9ed47935---ranixijefuzosiz.pdfIn PDF document text
    • http://pamat.ro/UserFiles/file/34642798500.pdfIn PDF document text
    • http://geometrarontani.it/userfiles/files/gatawevorotumosogew.pdfIn PDF document text
    • https://intrigantka.ru/images/userfiles/file/78407741865.pdfIn PDF document text
    • http://kondicionery-krasnogorsk.ru/upload_picture/file/dotekukasobaledijupisup.pdfIn PDF document text
    • http://stattus.com/assets/file/rukukenadegavilitobalip.pdfIn PDF document text
    • http://korvet-sp.ru/userfiles/file/rezotanevevuvasutomowaw.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160915b3559092---35352055222.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/d314a142d8e4b1d69d507deea6604b9b/likuduzijekasen.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160904f09256f8---wokabatef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=causes+of+left+axis+deviation+in+ecgPDF 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_off0000e6b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6B5 17472 bytes
SHA-256: 24bd72a68cc24e4bce85bcc4292fd52a7d3a8f1f91c6b75ad8b0dc3335655de2
font_01_sfnt_off00011496.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11496 10852 bytes
SHA-256: 7bb06eb5d31e0de5345165371c235c711f1e2cb02238ca4beeb6c4ad51d7ef9f
font_02_sfnt_off00012da6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DA6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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