Malicious PDF — malware analysis report

Static analysis result for SHA-256 634974fc18d2b0a0…

MALICIOUS

PDF

84.1 KB Created: 2021-09-19 18:05:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5b52cf86b1c8e4286944458a98fb7e06 SHA-1: ae20550ff3e66eff5cdb9f4f5d417ba1b857233a SHA-256: 634974fc18d2b0a03e1f2e6e610829da6f2e2dddcce9f81b65374eeaca72dde4
156 Risk Score

Malware Insights

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

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous links pointing to compromised CMS upload directories and disposable hosting, suggesting a link farm designed to redirect users. The PDF structure and heuristic firings strongly suggest it's a phishing lure or a distribution point for further malware.

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://gemwishrs.com/ckfinder/stones/files/17560171865.pdf In PDF document text
    • http://myphammonly.com/luutru/files/ririvegezafugafifoj.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137bd498435f---72281054657.pdfIn PDF document text
    • http://tyros-club.de/userfiles/file/90039895023.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/161410dd422e8d---gowijederuxuzopo.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/e790196fdbc63ac528beca94e7fcda3c/tarekujedesonades.pdfIn PDF document text
    • http://ipceurope.be/assets/file/73043461570.pdfIn PDF document text
    • https://bnovum.hu/downloads/kemolozododexoko.pdfIn PDF document text
    • http://lactopad.com/uploads/files/tanakujanu.pdfIn PDF document text
    • http://realfootball.gr/userfiles/file/begufebud.pdfIn PDF document text
    • http://trlgpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/76780755453.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/v1tmbja0tc2li0it9mp9tnqf7b/kagideroz.pdfIn PDF document text
    • http://tnhmc.com/userfiles/file/88028352990.pdfIn PDF document text
    • https://sevenhillsgroup.net/ckfinder/userfiles/files/gobepijud.pdfIn PDF document text
    • https://techinnsrl.com/writable/public/userfiles/file/lafumojipis.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/zijulonetewekesimap.pdfIn PDF document text
    • http://xn----7sbakn3aoflleitf3m6a.xn--p1ai/userfiles/file/23398769634.pdfIn PDF document text
    • https://lotteppta.com/beta/assets/file/52487267253.pdfIn PDF document text
    • http://buyo-g.net/userfiles/file/39730969285.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/siwebugimafu.pdfIn PDF document text
    • http://rydelko.pl/userfiles/file/xezup.pdfIn PDF document text
    • https://unitytradecapital.com/ckfinder/userfiles/files/segogalorugivelirov.pdfIn PDF document text
    • https://thieumaunao.vn/workspace/develop/uploads/ck_upload/files/2967986393.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/309efd67bad9b4b124bcd40ddfaa1013/toxeviliju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=defining+and+non+defining+clauses+pdfPDF link annotation
    • https://www.posluh.hr/ckfinder/userfiles/files/69073311408.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_off0000e079.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE079 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f88b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF88B 19116 bytes
SHA-256: 6044c9e9372191d7e45d4b3c1ffa27fcabfbb7cb37585e9133a31d42b86dad2e
font_02_sfnt_off00012a02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A02 10700 bytes
SHA-256: 0e69111d9faf348855848792b59b47b249346182932409dbee819add2bab7ab3

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