Malicious PDF — malware analysis report

Static analysis result for SHA-256 8491c3d616b17bda…

MALICIOUS

PDF

83.3 KB Created: 2021-09-08 08:26:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9ae8c0b480768c42840121fb9359b4bd SHA-1: e8142fc90a2317eb34dff1e424e95807ed84bfb5 SHA-256: 8491c3d616b17bdae240bf4d941bf51bf2b15af43e135959614b6b8cded7248d
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting a link farm designed to host or distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://axwelindia.com/uploads/kupedasazufeguxivevi.pdf In PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/9c215eee98d64923aeaf7450b8671bfc/91355910505.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607df3da55d40---lufumemivelaxusix.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a1d02486d6---4957005557.pdfIn PDF document text
    • http://rjt1.org/upload/files/jakakafudagelopoxawita.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/samadixisepikadefax.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3617152f09196b3f59ef0605a96be971/sutikivizugodofimesa.pdfIn PDF document text
    • http://baruraprotidin.com/assets/ckfinder/core/connector/php/uploads/files/16601092145.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/1f14b7074a1e3160985575c14c56759d/89264653529.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/26874255a9ace165aad8df2074178649/dogidagewipokusovivane.pdfIn PDF document text
    • http://rasmesafar.net/basefile/basefiles/zisavigefekevotoz.pdfIn PDF document text
    • http://slippersymposium.com/clients/875641/File/gitixetupasanulakedusizaf.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5fb714980d---50190197424.pdfIn PDF document text
    • http://maasmartcity.com/userfiles/file/xarazonufatof.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16085ff750a95b---76452575182.pdfIn PDF document text
    • https://www.sistemkabin.com/ckfinder/userfiles/files/nipuwadega.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608f0a311acc8---madipunimezixusesiw.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/31649707812.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b866a6e219f---gopululojopulemo.pdfIn PDF document text
    • https://xn--p3t29jo1ed4o4xw.tw/upload/files/98885833724.pdfIn PDF document text
    • http://vmkmsz.hu/userfiles/file/janamotamutejalibujodo.pdfIn PDF document text
    • http://hoskinspugs.net/clients/40498/File/86626731375.pdfIn PDF document text
    • http://staropolski.net/Upload/file/77770474042.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=forex+trading+south+africa+pdfPDF link annotation
    • http://pro.ovh.net/~tribuene/images/banque/file/78131097928.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_off0000e0f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f909.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF909 11032 bytes
SHA-256: ad29265300a448ea977396e4db59b7d2eb8e6ea8de23b43c4ec28666a92accaa
font_02_sfnt_off00011274.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11274 17440 bytes
SHA-256: b273522696e7de8a1e2749b9978bc9c3cbe727310f7cf11a42c5e161d4c84406