Malicious PDF — malware analysis report

Static analysis result for SHA-256 c10abfcc38c2326f…

MALICIOUS

PDF

67.6 KB Created: 2021-09-30 17:22:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6ed60947877fc1a731db5652a3c5986c SHA-1: 2578dde4cd1a2330cc0e3b8ff98aeecc76c1c1b9 SHA-256: c10abfcc38c2326fe17513a664312506cab2be05c9e7d539d0f617b0d70ec3db
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings strongly suggests the document is designed to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://herningbadintra.dk/app/webroot/upload/files/rotilamusalejonevej.pdf In PDF document text
    • http://pastadimatteo.com/ckfinder/userfiles/files/50594421124.pdfIn PDF document text
    • https://umartravel.com/files/sitaranulejubetobozadew.pdfIn PDF document text
    • https://bakotech.at/uploads/ckeditor/files/xinulefuxumopa.pdfIn PDF document text
    • http://erh-hu.com/userfiles/file/dufakipilijatumajoro.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144a21d700ac---9462534102.pdfIn PDF document text
    • http://dierenwinkelindex.nl/images/uploads/3750107531.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/161544c710ebe1---59104459810.pdfIn PDF document text
    • http://sooam.com/files/fckeditor/file/8494054646151cf7bcfad8.pdfIn PDF document text
    • http://mtsp.by/userfiles/files/neperunonulusinadigupe.pdfIn PDF document text
    • https://machnik.net/ckfinder/userfiles/files/54694426624.pdfIn PDF document text
    • https://robustbrakes.com/administrator/imagetemp/file/zabamakuwofadopiputaf.pdfIn PDF document text
    • http://xn----dtbhwhggdaoqfh3d.xn--p1ai/media/file/jasimizowafojez.pdfIn PDF document text
    • http://9275522-travel.com/userfiles/file/bupejogisuvidixu.pdfIn PDF document text
    • https://fenixfalt.com/userfiles/file/lebibebejepiwunejuwem.pdfIn PDF document text
    • https://www.db-ynox.fr/ckfinder/userfiles/files/97204861448.pdfIn PDF document text
    • https://expobar.vn/app/webroot/files/images/pages/files/dodopoxuzufowexad.pdfIn PDF document text
    • https://andymullinscommercial.com/home/andy/public_html/ckfinder/userfiles/files/43047564368.pdfIn PDF document text
    • https://vrrc.heart.net.tw/ckfinder/ckfiles/files/nobakagax.pdfIn PDF document text
    • http://metalltechnik-kutschi.at/79912850201.pdfIn PDF document text
    • http://12shio5.com/contents/files/zedisuwitemopig.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/95b377a73c6ee5e5bd2ab16b042fc55f/tizewaditujarana.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/96412058778.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=the+matrix+online+freePDF 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_off0000ae98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE98 14184 bytes
SHA-256: 314870e9e0e8d039d92326bf0cf2f00a616ad2f96ffe20db5cff090d6199a8a3
font_01_sfnt_off0000d211.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD211 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ea28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA28 10376 bytes
SHA-256: 37c088109224bc77b73f7cda30cb98e6a49dbe51a8f8ac054796619a35e1e659

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