Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c86630abe6a26f2…

MALICIOUS

PDF

80.9 KB Created: 2021-09-26 13:32:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: bd5d98b9756fe3e55e65e0e6bea4d886 SHA-1: bdbae0db5eebc7c78adb02920558ff41ceae45a6 SHA-256: 2c86630abe6a26f21c38d96a1451e4a4ddf9a5d41d17022684c4192dbe7dc665
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites or disposable hosting, suggesting an attempt to obscure the final destination or evade detection. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://isotech.si/uporabnik/file/kedofetomo.pdf In PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161326b07598d7---vajeguwadugabelitazoju.pdfIn PDF document text
    • http://nickels.design/ckfinder/userfiles/files/11339927569.pdfIn PDF document text
    • http://a-b-i-s.net/layout/bilder/file/jefiferisime.pdfIn PDF document text
    • http://armiikrajowej36.pl/public/upload/ckfinder/userfiles/files/57353849311.pdfIn PDF document text
    • https://mangalargalux.com.br/ckfinder/userfiles/files/71712794087.pdfIn PDF document text
    • https://kanat.com/upload/ckfinder/files/xulun.pdfIn PDF document text
    • https://lamaisonducoeur.ca/upload/editor/file/kikinowewojidaxabaned.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/077754e2c6d4b39f0f434b28dd02ab4a/sofepaforodalitabupi.pdfIn PDF document text
    • https://ataru.site/js/ckfinder/userfiles/files/romiruvumiwe.pdfIn PDF document text
    • https://okazdedziecko.pl/_files/Media/file/melusaluxumezawefenawi.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1615040a4537fc---posuzo.pdfIn PDF document text
    • http://gamebonda.com/ckupload/files/musalotonumutiponopunerob.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144bb70b10e8---jepivuru.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c75cb4421f---mepozazixu.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140d12495319---41679354236.pdfIn PDF document text
    • http://gizmakina.com/depo/sayfaresim/file/30881785790.pdfIn PDF document text
    • http://cdn.eagle.mn/uploads/userfiles/files/gumitevusaxemakivatanu.pdfIn PDF document text
    • https://ms1oke.com/contents/files/sobej.pdfIn PDF document text
    • https://stormester.no/files/file/17185768053.pdfIn PDF document text
    • https://hotelcorona.ro/files/lilabosifuvevivudikefal.pdfIn PDF document text
    • https://wroclawmodelshow.pl/ckfinder/userfiles/files/zakaxodesedamerelufavukif.pdfIn PDF document text
    • http://papianiarch.it/userfiles/files/vanozavafa.pdfIn PDF document text
    • http://temple.mo/userfiles/file/36677686585.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=tnt+mod+for+minecraft+androidPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b6cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cee1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEE1 22792 bytes
SHA-256: dd7fa9f7d46fd3cc48d938f17678f8bc664f64dcaddad872be387d4a65659df0
font_02_sfnt_off00010713.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10713 10388 bytes
SHA-256: 6fec5bf62116ac3fb0447b37b31cdf9f14515bb71bf34b07865830a392eabb7b
font_03_sfnt_off00011e84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E84 16424 bytes
SHA-256: 2e501901ab8205c9ba3b1808caa4319fbbdc09c1ceeb6e4f1d98461cba8a0e08

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