Malicious PDF — malware analysis report

Static analysis result for SHA-256 9420e6a6067bdd23…

MALICIOUS

PDF

71.3 KB Created: 2021-09-19 14:18:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 45cd8c905f2aa3416da72fe6d8c51246 SHA-1: 085ff41a8f96c718fdb4d16ed1831bdc16728734 SHA-256: 9420e6a6067bdd2304fd3224bb07cac8e2da9bbe5e214fcc41c090d2bc7169b2
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier with high confidence. Heuristics indicate the PDF contains a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. The URLs extracted are likely part of this phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://inwebjor.ru/uplcv?utm_term=how+to+watch+blended+for+free
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/161303053739ce---49161537674.pdf
    • http://foto-klub.dk/userfiles/file/sorogisijiresidemiratulib.pdf
    • https://kingcarmotorista.net/uploads/files/rokukuleraxajiden.pdf
    • http://lovec.bg/root/ckfinder/userfiles/files/genuvopenofugilepazur.pdf
    • http://citranco.com/users/files/misojasitavilewufu.pdf
    • http://mexvp.com/ckfinder/userfiles/files/dukojowosuvirurigabizit.pdf
    • http://posicert.com/upload_fck/file/2021-9-8/20210908000656413820.pdf
    • http://biosite.ru/images/news/file/13072529657.pdf
    • http://jmestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kapurozomefekojarixatugo.pdf
    • https://szelvedojavitasmiskolc.hu/files/files/71705196290.pdf
    • https://uleiuri.ro/userfiles/file/wobasuxojejeliwidone.pdf
    • https://hoavily.com/uploads/files/63925256113.pdf
    • http://akbarestate.com/survey/userfiles/files/nazevurina.pdf
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/161352d916ae00---88910708110.pdf
    • http://rosabaum.de/web/editor/files/gotilogabo.pdf
    • https://datxeninhbinh.com/data/dulieu/files/21570264777.pdf
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/16136e22bd342f---55290106835.pdf
    • https://studiopros.com/userfiles/file/
    • https://buyafranchise.org/files/files/bisirituzuxikok.pdf
    • https://andymullinscommercial.com/home/andy/public_html/ckfinder/userfiles/files/xuxez.pdf
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16135280f240cc---tajumejezodavobe.pdf
    • http://omgmediatank.com/userfiles/files/zezerirejujovasipelewur.pdf
    • https://lean-ds.com/upload/editor/file/19657412501.pdf
    • https://yellowmangocafe.com/userfiles/file/golima.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_off0000b162.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB162 16792 bytes
font_01_sfnt_off0000c979.bin
cd8358e389d97dadee9e46925ebcdd9fcb55ef22658f62c70913734aa7381d2d
pdf-font-stream PDF embedded font (sfnt) at offset 0xC979 10532 bytes
font_02_sfnt_off0000e167.bin
9303aaa17a9fee0abf31cb8cb69a3e8d1623c5ffdc0d81c2ab0c7c1b88c0fb94
pdf-font-stream PDF embedded font (sfnt) at offset 0xE167 18108 bytes