Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2aa3ee6da44e625…

MALICIOUS

PDF

75.1 KB Created: 2021-08-08 04:49:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 42f7c118d138dd25639a2059eede2935 SHA-1: 3dfc514d03daada6beceb96c83f8e38f49f5b5a2 SHA-256: a2aa3ee6da44e625304578862997271b24cd21b3d42be83da456ef7ca5abd128
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. Heuristics indicate the PDF contains a link farm pointing to multiple compromised CMS upload locations and disposable hosting, suggesting an attempt to distribute malicious content or phish users. While no scripts were explicitly extracted, the nature of the links and the detection suggest it's designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://sankofalectureseries.com/clients/a/ae/ae3037074ff26ae8502dacd236f4ced8/File/rexokuvojubokuvop.pdf In PDF document text
    • http://matsonconstruction.net/userfiles/file/gerolel.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/9dc416df6108af179f45a2d4cada79a5/7253036032.pdfIn PDF document text
    • http://classtool.info/upload/files/memuze.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608fa5cbe5b93---milomekodedomamaxagakize.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/17193746534.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a75e3e4e69f---lowosaki.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/16083b76bd1cb9---24748111364.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/264e3ce066ab781814e150407851dbbc/22473683445.pdfIn PDF document text
    • http://calisnt.com/uploads/files/61136871581.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607967df99448---34926621728.pdfIn PDF document text
    • http://dongzzang.com/userfiles/file///14304825057.pdfIn PDF document text
    • http://fzsvybbs.at/userfiles/file/44734988813.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/733877c97b0e51d2b86992889ad4ecc7/mikojarewupebadojabadekew.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/agtaa7q5k8kusia8ukui9ufouc/79104529064.pdfIn PDF document text
    • https://booknowrentalimo.ch/userfiles/files/mawuminegota.pdfIn PDF document text
    • http://kimhoatra.com/upload/fckimagesfile/sasogewajep.pdfIn PDF document text
    • https://hmanagement.net/userfiles/file/tiferojuzitisar.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160bb7a0e213ff---81780490129.pdfIn PDF document text
    • https://oilbasaro.com/web/images/ckfinder/files/20210801094240.pdfIn PDF document text
    • http://crystalsteakandstogie.com/clients/1/1d/1dbb6d5698303b6304ae84622e226a19/File/67329272013.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=sap+sd+delivery+header+tablesPDF 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_off0000c3c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3C7 10660 bytes
SHA-256: 975607c2945e3c8b99e7743f7c39cba25edee8325cd95517110ea8b50dfd7ffb
font_01_sfnt_off0000dc16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC16 16472 bytes
SHA-256: a45ab30b448e2043d6e5abcc18d2782504cbf6d5065384d4156f00e07d0d9087
font_02_sfnt_off00010716.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10716 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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