Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5c2ce32eda4308f…

MALICIOUS

PDF

85.7 KB Created: 2021-07-25 02:49:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: a329c280b473d54fb730036704c1819c SHA-1: 8b70b35d52af0d0aa8c96ae2ddd944e754a9ec88 SHA-256: a5c2ce32eda4308f39932d6a5f0cb3e36965202bcfc8be2bd9eeb2b66ae49622
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many hosted on compromised WordPress sites and disposable domains, which are indicative of a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the nature of the links and the detection suggest the PDF is intended to facilitate phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://xn--90aweabvm.xn--p1ai/ckfinder/userfiles/files/20640342684.pdf In PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aafd06e7d10---45425124886.pdfIn PDF document text
    • http://astro2sphere.com/admin/images/file/78709772010.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b928708c0e2---rorepofusazamepima.pdfIn PDF document text
    • https://orig-shop-gsm.ro/ckfinder/userfiles/files/11347662503.pdfIn PDF document text
    • https://chungcungoaigiao.net/uploads/files/11748647143.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/46778768472.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/0iegdkthq193e21uq1tf25ssj6/doxebo.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/94be526aafa0ae9524f96297fd25fea2/regupizadaje.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b7b5a89e4de---roxosuzibasodoz.pdfIn PDF document text
    • http://lumieretvie.com/userfiles/file/92571373374.pdfIn PDF document text
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210616192238.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fa49b23dc66---tufararolezumaxigajerima.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608539df03c5e---tidikufofiwen.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b9a7a9aabb7---60893585685.pdfIn PDF document text
    • http://yetisirkaucuk.com/firma/files/55736342631.pdfIn PDF document text
    • https://tonitomov.com/picture/file/baziwewezidenodop.pdfIn PDF document text
    • http://villalapinetafavignana.it/userfiles/files/vovawonot.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/5d752481eba7c467e5fcfcf678877936/vitopuxemanodanipid.pdfIn PDF document text
    • http://xn--2-140-swe8h.xn--p1ai/files/20152301583.pdfIn PDF document text
    • http://spl-designs.com/ckfinder/userfiles/files/telorinuzula.pdfIn PDF document text
    • http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/97619355354.pdfIn PDF document text
    • http://www.climatisur.com/ckfinder/userfiles/files/wipes.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=what+is+ats+softwarePDF 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_off0000ee01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE01 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010613.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10613 16812 bytes
SHA-256: 8952f0c0061604b60f83b3846762d1838b2b58a44c0eb5705e2faacffbcb9cbe
font_02_sfnt_off00013191.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13191 10240 bytes
SHA-256: c3e7f9c8965f10e25fbbe3e45847ea7293cf73dc172fb25403bc0341d557a0d0

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