Malicious PDF — malware analysis report

Static analysis result for SHA-256 6206056a9d60f1dc…

MALICIOUS

PDF

76.3 KB Created: 2021-09-03 01:59:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ece0e2b2a4544f0469ecd048a33b8a19 SHA-1: 1c4ac6367c485910f547388f73f26e0da90dff93 SHA-256: 6206056a9d60f1dcdf136a16e25e57ee76fcff5e0cd49a18546ce98c4ae4bc7d
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. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS upload directories, suggesting an attempt to lure users to potentially harmful content or further exploits. The presence of multiple PDF link farm heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/bfdd51d55971f24ab14fab761163e55d/todubenodigolerorokudil.pdf In PDF document text
    • http://moonlightmontessori.com/upload/files/68067518659.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a573b88294c---74090878438.pdfIn PDF document text
    • http://www.adarshvidhyasankul.org/userfilesfile/notajezisagudelivutas.pdfIn PDF document text
    • http://theettiaresottawa.com/clients/e/e8/e8f54e69a7463df9fd0adff13cd8e90f/File/wawikerozebuk.pdfIn PDF document text
    • https://stopserv.ru/files/file/59233469645.pdfIn PDF document text
    • https://ruiguoex.com/upfile/files/2021/07/13/dibagenek.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d12d74a384---60293594723.pdfIn PDF document text
    • http://faradtvandor.hu/picture/userfiles/file/puwemaretulepogirugoba.pdfIn PDF document text
    • https://fruzsiflame.hu/userfiles/file/28077117480.pdfIn PDF document text
    • http://sevinctekstil.com/resimler/files/4076529027.pdfIn PDF document text
    • http://soc-in.com/data/media/files/wewizunafetus.pdfIn PDF document text
    • http://avandcie-energy.com/ckfinder/userfiles/files/deduxinedegos.pdfIn PDF document text
    • http://bannails.com/fckeditor_userfiles/file/lidubijugunevu.pdfIn PDF document text
    • http://innova-perila.ru/upload/files/legosarujufinol.pdfIn PDF document text
    • https://lasvegasrebath.com/wp-content/plugins/super-forms/uploads/php/files/820faa9ec86ce91f66ebc7adeef19a26/vibojatal.pdfIn PDF document text
    • http://vishwkarmaenterprises.com/webroot/img/userfiles/files/konituwuru.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/cf15d028d0a549862141cbbb1502cf74/39329447962.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16119f0cf378bf---gowefivelapomep.pdfIn PDF document text
    • http://otohondamientay.com/upload/files/vekewojug.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/17406131307.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=spelling+worksheets+grade+2+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_off0000c5fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5FC 11152 bytes
SHA-256: f7179bad6d8ad0f2224949404bbcaaca9eefbc19151fee09c0427bf5c51dd391
font_01_sfnt_off0000dfdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFDF 17356 bytes
SHA-256: 4c54a783dcd6cda112db60d08bd35ba8e4a5f82798d0940ba13967b1940d1d18
font_02_sfnt_off00010c38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C38 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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