Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e244bc9cc616721…

MALICIOUS

PDF

81.2 KB Created: 2021-09-20 16:00:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: dcbe137bf76c84236d73a99e29513bc3 SHA-1: 6b9c50500aabc333add62216be33780dc7204703 SHA-256: 9e244bc9cc6167215fc7b1707b953b8128a6ded5598668bbbcc0d03cf8944d32
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, presenting numerous URLs that point to various domains, some of which appear to be compromised or disposable. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, suggesting an attempt to distribute malicious content or conduct phishing operations through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • 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://eastendmediation.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/ganotoxekosodisomati.pdf In PDF document text
    • http://xn--80aatg4aaaddkhfhbf3evf.xn--p1ai/ckfinder/userfiles/files/detajibaxutinekusobosizop.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/0252e9674e2c8d0203cdb4c10ed0244b/68939121619.pdfIn PDF document text
    • http://mamam.by/upload/File/file/36052298373.pdfIn PDF document text
    • http://inventory-acepipe.com/images/uploads/files/52008423723.pdfIn PDF document text
    • https://banderlogclub.ru/Files/file/gupilabefer.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16142b2bf21bc7---21734944699.pdfIn PDF document text
    • http://nanobubblevietnam.com/uploads/userfiles/file/mokuvevuwasakowox.pdfIn PDF document text
    • http://nena-artspace.com/ckfinder/userfiles/files/zateguxofunom.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/0b7227cb8d355ef8791eeab8bd781822/65567892891.pdfIn PDF document text
    • https://amt-alarmy.pl/userfiles/file/memodapakopefat.pdfIn PDF document text
    • https://ptogel2.com/contents/files/79828070713.pdfIn PDF document text
    • http://weorderfood.com/uploads/files/90170855408.pdfIn PDF document text
    • http://on-video.com/movies/movie_data/file/11173614520.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/161302f59dac5e---21221159862.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/bazisomadevepemib.pdfIn PDF document text
    • http://ekstelekom.com/userfiles/file/88237561182.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135e8c050641---zodetoxugatujirad.pdfIn PDF document text
    • https://mcdelandes.ca/uploads/file/pituxofadejixo.pdfIn PDF document text
    • https://www.caissedesecolesdu5eme.fr/backoffice/ckfinder/userfiles/files/nogibowiw.pdfIn PDF document text
    • https://www.comperat-89.fr/ckfinder/userfiles/files/pozanamol.pdfIn PDF document text
    • https://anfauglir.com/images/file/92953695191.pdfIn PDF document text
    • http://ruihuitax.com/files/file/20871860422.pdfIn PDF document text
    • https://classconnbio.com/img-jacson/files/60926403938.pdfIn PDF document text
    • http://fotofolliasanlazzaro.it/userfiles/files/11992136031.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=video+star+android+freePDF 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_off0000d95c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD95C 18244 bytes
SHA-256: 06538cc2a836ac45cc26aeb25e241dddd70eca69a00326045e5d947aea39e0be
font_01_sfnt_off000107e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ffb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FFB 10268 bytes
SHA-256: 1646264261e212b6430e9b3a2842e6e0ae9f2aa270e357b74e08bf46131a3bd9

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