Malicious PDF — malware analysis report

Static analysis result for SHA-256 311bc7165bd45b07…

MALICIOUS

PDF

75.7 KB Created: 2021-09-07 03:38:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e700565aef20a6b100adb4b3a97df375 SHA-1: efb8e1ba5865661b1409b746c28f18f57c82881d SHA-256: 311bc7165bd45b075a8223901d23933acdc146083d5472f006b040ff3b7e4c6f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various domains, some of which are hosted on compromised CMS platforms or appear to be disposable. The primary purpose seems to be directing users to external, potentially harmful content, which is a common tactic for phishing or malware distribution.

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://nesthomes.in/userfiles/file/15555184808.pdf In PDF document text
    • http://asirakademi.com/resimler/files/rozezabisum.pdfIn PDF document text
    • http://af.ssla.ru/images/fornews/files/nabenuben.pdfIn PDF document text
    • https://toromecanicorodeo.com/files/gidefeserukiredafopu.pdfIn PDF document text
    • https://fanaf.com/article_ressources/file/76170346403.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/khcf4me77q1puu3fo7lbpdsagb/furomamemarozegeteketo.pdfIn PDF document text
    • http://allnatureint.com/userfiles/file/ravux.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609a9fd9d8418---kinajibatagobusabiwe.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/dugatapabapadelebad.pdfIn PDF document text
    • https://mps-india.com/userfiles/files/falavusubibobunowesaso.pdfIn PDF document text
    • http://debsluxe.com/clients/1/17/174397649ed9f07baa8f9d9f48c72a4d/File/wovatijof.pdfIn PDF document text
    • https://creteotels.gr/FCKeditor/userimages/file/8627562539.pdfIn PDF document text
    • http://brain-sh.tw/upload/file/rijutenibetegaxupepepi.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/fobijegekujigeladavojum.pdfIn PDF document text
    • http://weorderfood.com/uploads/files/23867137163.pdfIn PDF document text
    • http://accomplishtheimpossible.com/userfiles_ati/file/43549896614.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081ca15e024c---nenosuxoxok.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b12d803dd2d---84820802732.pdfIn PDF document text
    • http://vejwun.cz/images/32783720037.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/61684439459.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/4ff87c3cb942b2962d787704938d7238/4679742953.pdfIn PDF document text
    • https://realxenon.ru/uploads/files/daruwofojularolunuzufubi.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/2236e69afc0643396f9017230f508572/13955332056.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=keto+diet+ebook+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_off0000c289.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC289 10136 bytes
SHA-256: 63ef5b60f1f66660162b5b4ddcfa0d4d224eeb3b253dfdb025c2ed2e7bf88cc9
font_01_sfnt_off0000d905.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD905 19408 bytes
SHA-256: 937c8a60941ca69d8371082995664ef39d30fdff00eae71e659bc545b85752e6
font_02_sfnt_off000109e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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