Malicious PDF — malware analysis report

Static analysis result for SHA-256 066c9fdb6e37ca4d…

MALICIOUS

PDF

76.3 KB Created: 2021-09-16 03:10:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 08804f7456554a495e3567e4bef39bc5 SHA-1: a44aec6d4ac587bb7a670566bfea6aa7261de179 SHA-256: 066c9fdb6e37ca4d01fdcf3343fb013faa82451fa3593afa9055881c6f06bf3a
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, and exhibits characteristics of a link farm. Multiple heuristics indicate the PDF contains numerous links pointing to potentially compromised or disposable hosting sites, suggesting an attempt to lure users to malicious destinations. The presence of many unknown URLs reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://cochemical.com/upload/files/jedejuzuxusatizog.pdf In PDF document text
    • http://lexprikson.com/admin/style/images/userfiles/file/kituraxegenoneta.pdfIn PDF document text
    • http://nage-z.com/ckfinder/userfiles/files/29485976787.pdfIn PDF document text
    • http://nhatnamvina.vn/rich_editor/file/24518088340.pdfIn PDF document text
    • http://haustechnik-hagenauer.at/nesexijosarusifalalujeje.pdfIn PDF document text
    • http://casaperugia.fr/userfiles/file/99786801900.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/161427cc149176---gezugavuxalulowilepad.pdfIn PDF document text
    • http://thibidi.vinadesign.info/uploads/images/files/95357488876.pdfIn PDF document text
    • http://makesomenoise.hu/upload/file/benawakedezesuro.pdfIn PDF document text
    • https://ckmusicdesign.nl/userfiles/file/44107321667.pdfIn PDF document text
    • https://giritrademark.com/content_files/files/76280149843.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/16137fc9b8a330---14267925698.pdfIn PDF document text
    • http://pzhjintai.com/upload/files/48225024296.pdfIn PDF document text
    • http://zvezda-rostov.ru/ckfinder/userfiles/files/38306641556.pdfIn PDF document text
    • https://magnanelli.com/userfiles/file/87547605394.pdfIn PDF document text
    • https://kueapem.com/contents/files/senuvomeva.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/pumeda.pdfIn PDF document text
    • http://viquadro.com/userfiles/files/62016352852.pdfIn PDF document text
    • https://ceccardolj.ro/userfiles/file/75830231232.pdfIn PDF document text
    • http://asirakademi.com/resimler/files/raromidobu.pdfIn PDF document text
    • http://firesecurity.sk/userfiles/file/xupumiwitujelavidig.pdfIn PDF document text
    • https://pemaboutiquehotel.com/assets/userfiles/files/86719201938.pdfIn PDF document text
    • https://brianhigbielaw.com/UserFiles/file/72993954817.pdfIn PDF document text
    • http://blekinge.boj.se/uploads/userfiles/files/vivevetidibusirizu.pdfIn PDF document text
    • http://bogaarchitetti.it/userfiles/files/63504951187.pdfIn PDF document text
    • https://beamstraffic.com/amb/userfiles/file/21889656.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/45d31e358afe57be090fb3a145a856f0/xagepipegiwixitijoripugem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=mha+season+5+release+date+timePDF 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_off0000c72c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC72C 10640 bytes
SHA-256: cf96a28909fbe1bcdb2b6e1caa16fb18a20e8ae454038a7f0cd4759f099e0b04
font_01_sfnt_off0000df5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF5D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f76f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF76F 17028 bytes
SHA-256: 77c83e56dded418ac042d76dd0698cd713015aacf64f9700588e7c2d5c645b11