Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f1b6e0ca3d2f974…

MALICIOUS

PDF

72.8 KB Created: 2021-05-23 12:50:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 47e9dc9791358e02222b3c0a8911c62b SHA-1: c02c7f5ce700eb33664ea847db8a664ddf0b17e8 SHA-256: 2f1b6e0ca3d2f97462344e1abd0787a5333e7b2543483eb36c0a884e73d60af0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains numerous links to compromised WordPress sites and disposable hosting, indicating a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious activity, likely serving as a lure to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/acecff814d80aebbfa4bca69eff3f2f3/73568169687.pdf
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/9fa1fb8059beb18a65f6dd2f786cd7ef/toluwazobidolu.pdf
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607f48620d9b1---kewesavufuru.pdf
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160aa13635d0d4---gakizukeboma.pdf
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef3aea182e---rupebanosigujizugaf.pdf
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160736d9bb17e3---vifokovimamopazogafafa.pdf
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608f80ba120ed---roxedanuwaxaludowom.pdf
    • http://fixafilm.se/userfiles/file/23358215060.pdf
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a412738536a---69273232051.pdf
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608e04c0d8676---xojotidilarofuteneted.pdf
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/2846886085f85cdffd9685a6be5d297f/dajowetepawesesol.pdf
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/02afad97bcbc391596849579b6de8289/35564838791.pdf
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a62bca0e04c---wemaduziwizejomomuz.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082e264e7b70---11306600346.pdf
    • https://alternativecarrepair.com/userfiles/file/pevixe.pdf
    • https://praward.tw/wp-content/plugins/super-forms/uploads/php/files/9b9fcf0ee1bd00b3322e97a1be1ae2b8/33951537718.pdf
    • http://shqinze.net/admin/upimg/file/%5C/28889939256.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=midmark+m9+ultraclave+cleaning+instructions
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d5c6.bin
dc2baba121c678d7b3baf7c2137fcc52bc1677751d1295a49e8ca302ba1da976
pdf-font-stream PDF embedded font (sfnt) at offset 0xD5C6 5544 bytes
font_01_sfnt_off0000e896.bin
a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620
pdf-font-stream PDF embedded font (sfnt) at offset 0xE896 1800 bytes
font_02_sfnt_off0000f123.bin
cd4c4a14db995bfa14659444b121beea0bf1cff35deb3b6c344ac1d89df6c1b8
pdf-font-stream PDF embedded font (sfnt) at offset 0xF123 10956 bytes