Malicious PDF — malware analysis report

Static analysis result for SHA-256 42c47415ec0bd5fc…

MALICIOUS

PDF

69.2 KB Created: 2021-09-05 17:51:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 32526c5c243a9f1f9c7190bdc265c528 SHA-1: 506dfb4a1a0a6565d1223cdbd90b6f63a46dc5e2 SHA-256: 42c47415ec0bd5fcc726910abb5a70f857999ed3b8f5c85fd733e0d8f0e158d5
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links, many pointing to compromised CMS upload storage and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and appears to be non-readable content, further indicating a malicious intent rather than legitimate document content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://mamotato.ro/userfiles/file/28439817167.pdf In PDF document text
    • http://drironcat.com/images/file/3463698928.pdfIn PDF document text
    • http://xn--80ab1a9a.xn--p1ai/sadm_files/70677069755.pdfIn PDF document text
    • http://basaritarim.net/admin/editor_resim/file/dobubab.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ff2886475d5---gomogejanunex.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/c977860ce60fa77d3edaf6c638f403a3/39170450492.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/1389003ee2733864cf4eb0d94bb2689d/86575167176.pdfIn PDF document text
    • http://france-ex.com/images/blog//file/8082839346.pdfIn PDF document text
    • http://3e-recycling.ru/app/webroot/filesfiles/rosulesibowufopa.pdfIn PDF document text
    • http://tradeweb.es/userfiles/file/gudowojutuwunenedelup.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/kq2haf4jp0tgmh15kheii5dkh4/42571702782.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d367e994529---bizekarekirozaxodi.pdfIn PDF document text
    • http://lamardaegu.com/upfile/user/file/82631892155.pdfIn PDF document text
    • https://cfi-registration.org/buzzboxgift/img/userfiles/files/bokiguzawoz.pdfIn PDF document text
    • https://greenlakepaint.com/ckfinder/userfiles/files/62840106180.pdfIn PDF document text
    • https://www.adom.biz.pl/ckfinder/userfiles/files/46938405857.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/plegl4h2mlpgs1qajr3nub835l/65428932286.pdfIn PDF document text
    • https://balbok.net/admin/ckfinder/userfiles/files/fulowitolozifo.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/25ca40c1ad038cba6d7d13320e4f2f25/bapopom.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0ed794a7f3---96175730233.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bea0dd08e94---puniv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=sword+oratoria+volume+4+pdfPDF 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_off0000b02f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB02F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c846.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC846 10792 bytes
SHA-256: 4968452ce7712f8b0ca7d028e4f9b3a3e10db164be1ae201870ec2f9ecd7ca2c
font_02_sfnt_off0000e146.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE146 15092 bytes
SHA-256: 908ae3ddca9169510502b08eaa3dcabb5897ef07712934c3d58b0d04f22e7931