Malicious PDF — malware analysis report

Static analysis result for SHA-256 db0f8a736fb002d7…

MALICIOUS

PDF

87.8 KB Created: 2021-06-27 06:47:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bfb02d3b7b351340a4913f8560464467 SHA-1: 5a8a561548cdae86cf681e74e48f689d48ad57d9 SHA-256: db0f8a736fb002d723a89356cfdc483835ee7548760a1d6d6c4764e328f48540
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a high number of links pointing to compromised WordPress sites and other disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL analysis are sufficient to infer a malicious link distribution pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/2c6010ope4t1b8poiu5ksab8dg/wuwiwat.pdf
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/f6519bd9d8dc47f222fac39f1677e5f6/6429344969.pdf
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/j3lc9nmngkps5uitshrrs8uq2e/29707461042.pdf
    • http://zhengfutz.com/v15/Upload/file/20215132313541536.pdf
    • http://robertoantoniz.com/resources/original/file/gumudibetigenusosi.pdf
    • https://actor-conseil.com/files/file/doziga.pdf
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608095e0908cf---runov.pdf
    • http://kursadowicz.pl/Upload/file/tofevovogusomum.pdf
    • http://brandweeramsterdamamstellanden.nl/userfiles/file/77808523661.pdf
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/7h957m57esdpnalt85mtevdkuo/33150252063.pdf
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b743014923---fekuzarukebutukunadede.pdf
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/8c54a1cab35dc3b7084615593045781d/16889292571.pdf
    • http://airconbank.com/upload/fckeditor/file/lixudasanimikasukunipake.pdf
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160801aaa3cf0d---45188794999.pdf
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071a7d663e72---gezoporanugevibasafa.pdf
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160929b85e9945---jepoziredaboneje.pdf
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/780fe19fdfab682fd0a73597124d105c/pomativazokemito.pdf
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/e46c36e7efe8bd459a1b9de19edeb8d7/60313499880.pdf
    • https://fultoys.com/userfiles/65416407101.pdf
    • http://techsystem.gr/data/uploads/ckeditor/files/74694481000.pdf
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/3ec3c353ed75e95ae1f03c0f869eeafe/85379623771.pdf
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160709752c1917---kutepanugaro.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c76b427db17---58509575617.pdf
    • http://anapharmata.hu/ckfinder/core/connector/php/files/fizomenanosez.pdf
    • http://dangkykinhdoanhkiengiang.com/upload/ck/files/79258866627.pdf
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/auvu32j2aj18sfodobbgvhq743/gobariwomaliwuxudibobipix.pdf
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16072af8f46c45---zutamepopuxekira.pdf
    • https://sandzak.best/wp-content/plugins/super-forms/uploads/php/files/8b44eb184846a12d92cde234d520023b/vakufakigonafagulamebi.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=reading+comprehension+reviewer+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_off0000f5b5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B5 16792 bytes
font_01_sfnt_off00010dc7.bin
09ec2a94548a1b6382413f640c0055fddba878ca76a70e46f792716650e18eb0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC7 16340 bytes
font_02_sfnt_off000137fc.bin
60f29da244fa669c6f9a66696015276d03cb50daac296655dee5079eff493516		 pdf-font-stream PDF embedded font (sfnt) at offset 0x137FC 11120 bytes

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