Malicious PDF — malware analysis report

Static analysis result for SHA-256 9886379558e8d75f…

MALICIOUS

PDF

94.0 KB Created: 2021-06-27 23:58:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d675f8420fc63883a309d23361b7ab3f SHA-1: d9535530a2e13d184d3646a158871ff42b1dd751 SHA-256: 9886379558e8d75f15b95ba1c1ff398a0c823666def2bd190e4ea88cbd024536
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to numerous distinct hosts, many of which are compromised CMS uploads or on disposable domains. This suggests the document's primary purpose is to lure users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5025124ad---39466711670.pdf
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3c83197eaf---sonin.pdf
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160767a663e6b9---bexuxunalazewiv.pdf
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/45107a60346f74cca87603373041cfc6/kerajulik.pdf
    • https://anfauglir.com/images/file/pijodumobotonolu.pdf
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d6b3392a04c---nufejirab.pdf
    • http://www.sport-konyv.hu/userfiles/file/binajumekapanim.pdf
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/bjtmj1ib9sdjshc7dqjh9tns20/kafasuxagojugomom.pdf
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c28e8fb129f---wukonobev.pdf
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/baf82407637bdd68543969689e521803/75413670517.pdf
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/16075aff442a64---66072350495.pdf
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a4cb8f2793b---vuruvenulaboli.pdf
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078d08b5333e---vidagodoratuzubimetit.pdf
    • http://staractivecollection.com/resimler/site/files/15847457269.pdf
    • https://ajur.rest/uploads/userfiles/file/78328344190.pdf
    • http://sushiloverca.com/uploads/files/tekenisivajaraviluwebimo.pdf
    • https://detectiveoffice.net/userfiles/file/sisawifudo.pdf
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/im1vt9s8s1effm46a870sju615/vunanarewedatopaz.pdf
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/7d1593dba5c48f70e9d38c81b6ea14bc/farajidesegow.pdf
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a756c34caf0---tapafi.pdf
    • http://aprendanow.com/wp-content/plugins/super-forms/uploads/php/files/985347982968d635ae6e4e9f7977c01c/katofejumeladixakakosiga.pdf
    • http://bright-mineral.com/uploadfile/file/2021062317074142.pdf
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/56c4309689598c3859222de059a40997/fukojevapasijebipad.pdf
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607bce70254d8---kamebogitovalizanosog.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=used+scamp+19+for+sale
    • 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_off00010cb3.bin
e986a552545a07f063911db252da4e5bb291d3ab81bbda6417955d3b9a78c2d1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB3 10716 bytes
font_01_sfnt_off00012556.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12556 16792 bytes
font_02_sfnt_off00013d68.bin
1ab5d28dbe51a4d7d53e96c2c3f64f75151a8acb01ccd551e60f120056004437		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13D68 17108 bytes

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