Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ed75e6129d9afde…

MALICIOUS

PDF

81.3 KB Created: 2021-09-07 04:55:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e74bde9aa1cd59331eb66a9e533cd364 SHA-1: ad89da18ce78589211dd444947969f24a0971ad5 SHA-256: 6ed75e6129d9afdebefc055ea6695442b8de9f5adb2367c8e437703d575d30dc
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of numerous external URIs and link farm heuristics points to an attempt to manipulate search engine results or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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.annaleehuber.com/content_files/file/lixepepixovabirotilulig.pdf In PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607459881b032---porojinujorevuni.pdfIn PDF document text
    • http://detaycopymatbaa.com/userfiles/file/gufiruliguwomuzefate.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/16095fea4921ac---652380511.pdfIn PDF document text
    • http://rutherford58.com/clients/5/5b/5b2824e44de76337c32dfcbc3ee6dba3/File/legatozetopemutob.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/raxulikiteloronanez.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160c6df8da1bbf---lobejazisusozifabomupud.pdfIn PDF document text
    • https://chmelo.hu/sites/default/files/file/dekemuzakib.pdfIn PDF document text
    • https://sardavetri.it/userfiles/file/63971388274.pdfIn PDF document text
    • https://anfauglir.com/images/file/88649726027.pdfIn PDF document text
    • https://sibconsulting.com/contents//files/bevifekubawowogi.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/3ijibqveqqiglqugbhrdfdcof4/49551202865.pdfIn PDF document text
    • http://bonapartefamilynetwork.com/clients/7/7d/7d081654635712149502d88e72c54c2d/File/xesazarajutifonobenafaze.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160ae8b630538b---kajepitemosi.pdfIn PDF document text
    • http://sam-global.ch/files/file/vuvujugopogobik.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160b7c1dc68d0e---98076939522.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fe21bfa044f---pevubafi.pdfIn PDF document text
    • http://altus.pl/userfiles/file/fokosinawimarox.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/riligidizomovalarav.pdfIn PDF document text
    • http://landpas.pl/upload/file/kimakodogejedomizeditodit.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/92f6804949546fa33b2285b06069d7e6/88122398717.pdfIn PDF document text
    • http://juliesfundforkids.com/clients/d/d6/d6f17a7a4e9d342a12f8f8eeddb80b2d/File/tataxumolegem.pdfIn PDF document text
    • https://smallislandcurry.com/wp-content/plugins/super-forms/uploads/php/files/d3269daacba63cdca638a549132dc613/53888795016.pdfIn PDF document text
    • https://burragebrothers.com/demo/jolie/beta/userfiles/files/41034857440.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/qjak2bj289692qkrl6tbuusta0/81064914887.pdfIn PDF document text
    • http://kameleonhastanc.hu/files/file/kukore.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=english+grammar+in+tamil+pdf+downloadPDF 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_off0000d83a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD83A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f04c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF04C 17844 bytes
SHA-256: 4d7c56da3f23df81be2ca6cec620438a8bcfa09cbd499069607759920518054a
font_02_sfnt_off00011e94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E94 10884 bytes
SHA-256: ec6abc256bba8693599c30c000a0f7e2322853974e15a8ada771493cd666004b

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