Malicious PDF — malware analysis report

Static analysis result for SHA-256 80b046d3d5ec4e99…

MALICIOUS

PDF

77.6 KB Created: 2021-09-07 18:53:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2056d29767869e24a23d569d8752baa5 SHA-1: 26a895df51cd0014ca6926cc5b8a76c83953e70b SHA-256: 80b046d3d5ec4e99d85f7438f92bace41f91ec542700672bb04f8744abfa0e6f
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which are identified as link farms on disposable or compromised hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document's structure and the presence of multiple external links suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://isemya.by/modules/ariol/static/ariol/ckfinder/files/nunewonika.pdf In PDF document text
    • https://fwstc.in/userfiles/file/jodok.pdfIn PDF document text
    • https://okna-stv.ru/userfiles/files/67552202743.pdfIn PDF document text
    • http://natpuedu.in/userfiles/file/54583843492.pdfIn PDF document text
    • http://maturitni-ples.eu/UserFiles/File/55581270018.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609e1f75e313b---94087188658.pdfIn PDF document text
    • http://mathrainbow.com/userfiles/file/16671860292.pdfIn PDF document text
    • http://baaningdoi.com/file_media/file_image/file/tumarinivagujelaresasob.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160b2d4bcd6e25---xetevamonuxerazep.pdfIn PDF document text
    • http://alwaditrading.com/userfiles/files/20568400487.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb6cac5cef---94978538107.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/161257e52043cb---toxuxido.pdfIn PDF document text
    • http://myrbacken.se/login/ckfinder/userfiles/files/befunipegekow.pdfIn PDF document text
    • http://www.hkrns.org.hk/ckfinder/userfiles/files/35154531500.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7beb3628ca---57639051477.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/6975685436.pdfIn PDF document text
    • https://sportcity.bg/webroot/img/content/files/19809313206.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/dc8c99d1c02e2ede451a5a6bbeee8a8b/nevugajotug.pdfIn PDF document text
    • http://diakmelo.hu/ckfinder/userfiles/files/vibejularogisofiz.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1e57ef570---20683315292.pdfIn PDF document text
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/d9f0a257588abaf9b10ab89429a16ae4/luxufiv.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/mj84n55dmt93t66222g527fd4r/vuduxekagatafikomevuf.pdfIn PDF document text
    • http://trunghungplastic.com/luutru/files/1147648225.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=rohingya+refugee+crisis+pdfPDF 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_off0000cb48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB48 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e35f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE35F 11016 bytes
SHA-256: 489adb83ad3a2a5bd6f8e29b2f2d9c86177997f2372d7db4341e6219db067221
font_02_sfnt_off0000fcc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC0 17360 bytes
SHA-256: d85adc28615b54a04c55c17cbca2a4f1cec0f27b27d1c88be85e0995a6340fd0

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