Malicious PDF — malware analysis report

Static analysis result for SHA-256 de66980070ccc02a…

MALICIOUS

PDF

72.0 KB Created: 2021-09-26 21:49:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: eb1daaf02b9366e254e439c37e59f1d8 SHA-1: f68242cc504191a398ea515f147ad3e174c21df5 SHA-256: de66980070ccc02accae01ea79a863584b624dafb09d200d3377674790fbfce2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or are part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution through these links. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • 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.
  • 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 https://drafthe.ru/uplcv?utm_term=app+lock+photo+recovery PDF link annotation
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/c84f53d5ac96f7e102f28f265fba5637/sizogeperiwane.pdfIn PDF document text
    • https://butagallery.com/userfiles/files/83759620741.pdfIn PDF document text
    • http://www.luna1956.com/images/library/File/70871839157.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/0b49ed15053ea5692d7c7054bf648142/50234328981.pdfIn PDF document text
    • http://tatugigo.com/ckfinder/userfiles/files/44564274210.pdfIn PDF document text
    • http://kiddeefire.com/media/userfiles/files/bijukedakixujomefaluwu.pdfIn PDF document text
    • http://mundori.com/js/ckfinder/userfiles/files/jojenalizidetonafewar.pdfIn PDF document text
    • http://www.coverseg.com/uploads/ckfinder/files/12386007283.pdfIn PDF document text
    • http://www.sloepverhuur-debiesbosch.nl/upload/files/sezizomixoveporig.pdfIn PDF document text
    • http://aldobini.it/userfiles/files/78927181476.pdfIn PDF document text
    • https://viktorina.ledoritulys.lt/files/tutavo.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/1a9c870a522e353a140c4cdd9ca2b652/jisagefupevujutogaz.pdfIn PDF document text
    • http://budaikepkeret.hu/uploads/file/72309084440.pdfIn PDF document text
    • http://greece-ex.com/images/blog/file/jedigorexagila.pdfIn PDF document text
    • http://www.aragonemprendedor.com/userfiles/files/wujowoverobofixisaxib.pdfIn PDF document text
    • https://rent-1.es/ckfinder/userfiles/files/81910755955.pdfIn PDF document text
    • https://unibel.pl/pliki/upload/file/92126533388.pdfIn PDF document text
    • http://centralcogtc.com/uploads/file/89541241944.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/043ff6812a2acd8d5944f36f0c8866b3/43203332603.pdfIn PDF document text
    • http://radioevangilereal.com/assets/ckfinder/core/connector/php/uploads/files/falutudami.pdfIn PDF document text
    • https://hkfew.org.hk/ckfinder/userfiles/files/31772959170.pdfIn PDF document text
    • http://imhkayseri.com/resimler/files/xuwurerelixe.pdfIn PDF document text
    • 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_off0000b4f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4F2 18096 bytes
SHA-256: c1a8b8ef05328d887598eaac4562aa2e65598aca4724701ee2fc565f7c82da83
font_01_sfnt_off0000e3a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A3 10200 bytes
SHA-256: dc1ed9c18a2b8a10a37f9fcec75f46ab60b5dbfefec4454a731c20de503dbef0
font_02_sfnt_off0000fabe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFABE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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