Malicious PDF — malware analysis report

Static analysis result for SHA-256 58dbf2ca86dc3877…

MALICIOUS

PDF

87.6 KB Created: 2021-06-29 05:20:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b1255642f43a0b2383118e101b30a519 SHA-1: 308ee91ffc794519091236be541a07a32a670b75 SHA-256: 58dbf2ca86dc3877348a392500e855e8fc0e3ac08e509f171d50e60e70012ae8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other domains, likely intended to distribute phishing content or malware. The presence of external URIs and link farm heuristics strongly suggests a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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://crysiq.ru/uplcv?utm_term=what+angles+are+always+congruent
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/ff765a752b3925eaa80ba7a5a0e30f61/ritigexanavaxewudene.pdf
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/fbdd3d15edc3c3ff25245f81384f9857/kadobefadoduwejoveteremaj.pdf
    • https://sunrise-photon.com/upfiles/editor/files/98655642275.pdf
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16079d43762ffb---fupozevuze.pdf
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/7e932b054e5a7541215c15e2f4ae5858/41658028424.pdf
    • http://serdceprirody.ru/userfiles/file/livoki.pdf
    • https://soechi.id/userfiles/file/jivitamapi.pdf
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/mftua6uuc622ubkmvdh7lm3hv6/76562861472.pdf
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/nokmgqol13eo5p2ja2t6opg93a/bogebegefad.pdf
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/ca591b003a6f0736b1d309fb0fd9e0d2/woduwu.pdf
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/m4jg66osofrrkdoeogh4hj1ns3/21589162586.pdf
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160ce94ba1947a---gupoxasuredelovitaf.pdf
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085f94adeb73---kejidodijojimu.pdf
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a62f0a2a972---26583867711.pdf
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160baf873c3abb---4293510683.pdf
    • http://jncs.kr/page_data/file/20210629093752.pdf
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/enu13lume0n6qm6oqg377t04a8/loler.pdf
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0ec416fe95---korabuzu.pdf
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba0a2a547c2---dorixemuvekasutege.pdf
    • http://africa-emergence2019.com/userfiles/file/84752328673.pdf
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/a929be746dd8c289e956b1e7e1138076/ronekidufarujafotap.pdf
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a1534fd1cf4---botebiwifowowebat.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd8e.bin
98a6a2c08f59cc32b47ab3975dac51164d10eeb235469346383e345af2e272cc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD8E 16944 bytes
font_01_sfnt_off000109f5.bin
d8b4ac52e6311527f3240ce66c9ecf30dd871522ff01cdc63dca8faa062c2b7b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109F5 10708 bytes
font_02_sfnt_off000122aa.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x122AA 16792 bytes
font_03_sfnt_off00013abb.bin
5ef105d66d99bddfffc8eae27bc455f0fb292199e7eba6d12e90ca33cb45f34e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13ABB 16284 bytes

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