Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9d663586f8509f3…

MALICIOUS

PDF

86.7 KB Created: 2021-09-24 01:00:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7ef782a2808eea5b9f464163c70148cb SHA-1: 04267b24300c6e4892bb3ecee8df7fc256ed19e3 SHA-256: a9d663586f8509f3d34fedc662885eb9e98550f02180e8d9694e536209256010
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains numerous external URIs and links to compromised CMS uploads, suggesting it functions as a link farm to distribute malicious content or phish for credentials. The presence of multiple distinct hosts and UTM parameters in the URLs further supports the link farm and potential phishing attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://catamma.ru/uplcv?utm_term=someday+my+prince+will+come+lead+sheet PDF link annotation
    • http://xn-----6kcaheblih5ab0a6afqbzoqe.xn--p1ai/ckfinder/userfiles/files/1914264031.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/83280455772.pdfIn PDF document text
    • http://cayxaotamphan.net/userfiles/image/file/legig.pdfIn PDF document text
    • http://smolninskayahotel.com/userfiles/file/lasabivopapokes.pdfIn PDF document text
    • http://www.neoneofitou.com/ckfinder/userfiles/files/nusixawabikolosubabo.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614ae2f9beaa3---33440776819.pdfIn PDF document text
    • http://thekreativecompany.com/uploaded_files/userfiles/files/5718505287.pdfIn PDF document text
    • http://zeroseistudio.eu/userfiles/files/92290526215.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139a1df3bd36---29395160150.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a2d7eb495c---vogirulimobusipiwovoni.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/161316ada7b9e9---27125671264.pdfIn PDF document text
    • https://wronba.pl/uploads/wysiwyg/file/58921334544.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/99052154870.pdfIn PDF document text
    • http://wooshin.kr/uploaded/file/1154414825613e44c58f19f.pdfIn PDF document text
    • http://hasicimosnov.cz/foto/Image/file/59669257604.pdfIn PDF document text
    • https://girilawfirm.com/content_files/files/35377075666.pdfIn PDF document text
    • https://greenfins-thailand.org/uploads/file/80816801393.pdfIn PDF document text
    • http://jhdljz.com/userfiles/file/1630529190.pdfIn PDF document text
    • http://dokumsuzgec.com/userfiles/files/82997613244.pdfIn PDF document text
    • http://seanbittinger.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/655088242.pdfIn PDF document text
    • https://ahirealty.in/admin/userfiles/files/54448158375.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b90e28f8ad---damege.pdfIn PDF document text
    • http://biolabsrl.org/userfiles/files/kevoxixemubuxal.pdfIn PDF document text
    • http://degeninhotel.ru/admin/ckfinder/userfiles/files/limatarobemixu.pdfIn PDF document text
    • http://villkasz.hu/editor_up/jexikadari.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_off0000dfd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD3 22932 bytes
SHA-256: e1e43f66e5496a509cbda2063f8b269e5887a6d2dbf1faec0d38255b4c654492
font_01_sfnt_off00011b93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B93 11052 bytes
SHA-256: 17e1e85791948f8c1f7f8d711b8f04d3ddb149c04ce0f8b1362d1abe1f460476
font_02_sfnt_off0001352f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1352F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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