Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d9c7f9ac4f94510…

MALICIOUS

PDF

129.8 KB Created: 2021-07-02 05:19:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4f8dba57cd9639b668c2fab5b65b6f99 SHA-1: 0f8ee7274c0c0b3a99dfbb68f2c3d02e438081b9 SHA-256: 9d9c7f9ac4f9451017fc50c6d952ad242a6bc5d4b0f86ceec16ccaca687de4e5
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file functions as a link farm, containing numerous URLs pointing to compromised websites and disposable hosting. These links are likely intended to redirect users to phishing sites or download further malicious content, aligning with the characteristics of a spearphishing attachment.

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://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bc53dbebf60---55365159158.pdf In PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/b43b07a0905b28f51166d388df07409e/22548442890.pdfIn PDF document text
    • http://studiogaleazzo.eu/userfiles/files/10541195568.pdfIn PDF document text
    • http://bmhs71.com/clients/c/c9/c97ff408e01126d63256cf68004d6641/File/tiveweboxilefipilul.pdfIn PDF document text
    • http://ministerium.pt/files/jigawuj.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/74029ea99b1c63750796bd290fbd8461/mefizojo.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/siuspruqfnadgchi3e3sg5ecdh/xuxowe.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/cdb9266959d84df3d8565ebc27d951d0/zabojowinadapizirozulef.pdfIn PDF document text
    • https://artbynela.com/uploads/file/36404412880.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a29ff581509---58165496577.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/xiweki.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/keis2tl5rraaafenv183sletv0/xuwunejisulenufapudokigu.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/1714047625.pdfIn PDF document text
    • https://propactionvehiclesuk.tv/userfiles/files/medoninubezitaf.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/03895be69e96f5a3e7a247afe674572a/72361343904.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/g1b7vbj0g1s2ob12ja6b0potps/perazuzib.pdfIn PDF document text
    • http://whatdwellswithin.com/file/liwidisenulemopakotidiju.pdfIn PDF document text
    • http://hondasushi.com/uploads/files/jepisorajoga.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/fd27580bf961026bdf27734c8d9b850a/nagum.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070c03092f9c---47571208446.pdfIn PDF document text
    • http://heibldr.hu/FCKfeltoltott/file/pikizizelenev.pdfIn PDF document text
    • http://kartinatv.org/uploads/files/7557537484.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=types+of+horticulturePDF 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_off00019a96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19A96 17924 bytes
SHA-256: 4b364cf93e0aef2e6e00093c088723d92f701d6f4cdcb1c427b069752c0c1e9f
font_01_sfnt_off0001c997.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C997 10488 bytes
SHA-256: cd343c461ce214f1fd166297c2c47d756a9381f927b8fc679d08cd522e4b9c25
font_02_sfnt_off0001e1a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E1A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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