Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f70906fd76bdaf3…

MALICIOUS

PDF

94.9 KB Created: 2021-09-16 11:25:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2d4a9c19c7849c04d40fd6c4280c502a SHA-1: f3a01e782e9ea3477f2ecfd01f191e11e959562f SHA-256: 6f70906fd76bdaf38f292d9ae4da9944c7bc86a8985ac04e8e1c20fc8a215ef2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and a large number of external links, many of which point to compromised WordPress sites or disposable hosting. This suggests the document is part of a phishing or spam campaign, likely attempting to redirect users to malicious sites or download further payloads. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://krisoc.ru/uplcv?utm_term=javascript+engine+android
    • http://ydchem.cn/filespath/files/20210903210712.pdf
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/161390a01af97f---xetonakovakoranawepadiseb.pdf
    • http://tuecpa.com/file_media/file_image/file/92979566645.pdf
    • https://pelicanfinancialnetwork.com/ckfinder/userfiles/files/38856789005.pdf
    • http://otohondamientay.com/upload/files/23056066265.pdf
    • http://speckrepeg.by/UserFiles/files/tajebijepedi.pdf
    • https://footballsod.com/images/ck-uploads/files/betakolebamujipos.pdf
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a99f759ed7---28328527930.pdf
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a2e6e89e10---25767633842.pdf
    • http://arohitourandtravels.com/userfiles/file/sixisoturalofojexagem.pdf
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161341f7570463---pesafuzovaxako.pdf
    • https://almudenafernandez.co/ckfinder/userfiles/Files/fibazixewavabixedezojemox.pdf
    • http://ana-jsc.com/upload/files/75996800752.pdf
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613c640f0932b---bojevagolukak.pdf
    • http://laiyi-art.com/userfiles/file/80334096685.pdf
    • https://chinatupai.com/web/js/ckfinder/userfiles/files/46254596452.pdf
    • https://ka-base.no/images_content/file/44791094124.pdf
    • https://www.mnogotrop.com/ckfinder/userfiles/files/gumoduxupanosefejuwi.pdf
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/15020d6e4bf057c6af6d54380bfd3e63/22233797137.pdf
    • https://cpsguffanti.it/uploads/file/robuzaronomikisiw.pdf
    • http://ingatlantv.tv/userfiles/files/purawokeb.pdf
    • http://healingtown.org/userData/board/file/8765495685.pdf
    • https://ottopianos.nl/files/mefexifefunejerusiwewomof.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010a40.bin
b977139c1fb1048fa9903dabcb702ad4351a095d89d94afefd1767b3dd1d5f05
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A40 10700 bytes
font_01_sfnt_off000122bf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x122BF 16792 bytes
font_02_sfnt_off00013ad1.bin
1ed71c0b87b42d321bb09c8907d68a040065bab3b82223e355415ed91cbc2af9
pdf-font-stream PDF embedded font (sfnt) at offset 0x13AD1 19408 bytes