Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9b3cdf152b19caf…

MALICIOUS

PDF

87.7 KB Created: 2021-06-27 06:10:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: eb6014ee74444d88404db8d901da24dc SHA-1: 7ba7ade099e6b5c547be4840e4ac75bb5b2112cb SHA-256: f9b3cdf152b19caff869d97631455831885bb4607f1ecf51145844c00294654c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external links, many pointing to compromised CMS upload storage, suggesting a link farm designed to redirect users to malicious content or phishing sites. The presence of embedded URLs and the nature of the heuristics strongly suggest this PDF is part of a phishing campaign or a downloader for further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 https://irlanc.ru/uplcv?utm_term=top+snow+removal+companies
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a5b691e6db---nogamiburikixuvaka.pdf
    • http://chsbicentennialclassof1976.com/clients/c/c2/c283bfa2537a82fb79a670aa087b4bd4/File/gugifu.pdf
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608c642f82353---31483473056.pdf
    • https://aquafilling.com/userfiles/file/tobopagizikapidubovef.pdf
    • http://blackshirts1962.com/clients/f/f2/f245580d3072b78cda2271cf7a7e3f61/File/4073991437.pdf
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/6mifh7m9hmuk03dd4fktlo9o4j/wisegepametulurosi.pdf
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073bec9d6415---12202384241.pdf
    • http://www.contectrade.hu/fckfiles/file/47953622578.pdf
    • http://emotionpicturesfestival.gr/userfiles/file/jepebuvegawurododuneve.pdf
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0a9b401c81---fabowurevukoregipuniwub.pdf
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/08qa711n4qvmheka2tc3ho19fr/51920077309.pdf
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbfb49c92f9---9038821067.pdf
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b809431289---zanepufibezagerufi.pdf
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16088dfa870af8---74409370983.pdf
    • http://www.apsetedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608496b6b3c1f---pizupiwek.pdf
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adc08909d5d---80050364180.pdf
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/83ca09384ff82a5af51d07b156448d24/21125337588.pdf
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/a9sdu2a2ent0u6thoeqnetocuo/64530239074.pdf
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160b14f74402b2---88723996143.pdf
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4b4bbf3344---loduj.pdf
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080656951440---botosagowajokawapubanu.pdf
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608f69244e321---19312139058.pdf
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5c8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C8 16792 bytes
font_01_sfnt_off00010ddf.bin
aac700a5e313fdfa875053fcbebb5a7026a1a1276a0927b0651d6d64e6b6c425		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10DDF 10552 bytes
font_02_sfnt_off000125f5.bin
163f7510f7c4c90d3e625eac183635c50eef57d86b57e49dae19b2184f137cdb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x125F5 16856 bytes

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