Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cec110e8ea3e3c5…

MALICIOUS

PDF

86.0 KB Created: 2021-07-31 13:47:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 3e8a04f90f2a41ca27ad23bdd0bc2fa5 SHA-1: 35fcb9149c11822abd3303abe9e96d6159c0dbc3 SHA-256: 5cec110e8ea3e3c5f653729f1bd593a8ce260833193a0ba0a08340239bda8648
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised or disposable domains, indicating a link farm designed to lure users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL analysis point towards a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://harryreichert.de/uploaded_pics/News/file/degotor.pdf In PDF document text
    • https://lysgaards.com/ckfinder/userfiles/files/56773546142.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/328eigjjin84lnr65alf5ktb7n/pubelevatuxopug.pdfIn PDF document text
    • http://vervesimuhub.com/userfiles/file/75043612392.pdfIn PDF document text
    • http://www.ecostroyservis.ru/File/60055361384.pdfIn PDF document text
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/42b00fb1b1fbc2aa6bdc12da6e6da6ed/25415235918.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609bc81a25064---89041356600.pdfIn PDF document text
    • http://duepassidalcentro.it/userfiles/files/kuwibe.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/053b99c81c422007d4567f0e38ea3e92/sasidugitijonikevebasi.pdfIn PDF document text
    • https://fanaf.comarticle_ressources/file/77281068588.pdfIn PDF document text
    • https://cortemadera.com/wysiwygfiles/file/rixurigu.pdfIn PDF document text
    • https://agroadvanced.com/app/webroot/newsletters/editor/files/10752201736.pdfIn PDF document text
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/basedex.pdfIn PDF document text
    • https://samarpanbharat.org/trila/userfiles/file/jemogusiwelunilibetiba.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608a932e7c216---vosatiwelaberaloxazefugux.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072644e358e0---77388185459.pdfIn PDF document text
    • http://mnwebdesign.dk/userfiles/file/godos.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085b58288ba5---34058829846.pdfIn PDF document text
    • http://businessdevelopmentcenter.pl/uploads/userfiles/files/zifek.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609756c2b25c9---lazewetawaxitamalinupex.pdfIn PDF document text
    • http://wolfroccatiassociati.it/userfiles/files/miwujokonekuzok.pdfIn PDF document text
    • http://utuin.net/files/fckeditor/file/53923705083.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/1b57db201eede6ca2731a1c2fff1504f/nigiko.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=free+bullet+journal+printables+2020+pdfPDF link annotation
    • https://tes-sys.com/uploads/ckfinder/files/20210716/16264207799599.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_off0000ebd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000103f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103F0 11080 bytes
SHA-256: 9d83d27d747dd98e72bcd3344f6f443d98c46527850fdc3cf26e90a3017a21a0
font_02_sfnt_off00011d9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D9F 17240 bytes
SHA-256: b3d956c135aea97c34bc3d0cdf35c5a26392d3576c5c3e901fbb576c8f0b0b71