Malicious PDF — malware analysis report

Static analysis result for SHA-256 683000be4e020cef…

MALICIOUS

PDF

86.4 KB Created: 2021-07-06 16:34:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 64a270fea389b5ba9c4a94c8b8ebb9e6 SHA-1: 3bcd2704d1ff7b522cd43d6e1335e15d0d759d62 SHA-256: 683000be4e020cefedabb1f5f00204bfa458599622abd54bc64185c289b79287
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection T1204.002 Malicious Link

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the presence of multiple compromised upload URLs is a high-priority indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dff700a0b50---16907718486.pdf
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/45c0256c26b46560f7787829a45824c9/gukimus.pdf
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/3c97c1a2f51cee6eb12e7314b1676ea3/7685643556.pdf
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/qicrctcp5pjfln81v3ql5aolp9/5517453035.pdf
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/c28c1fd633ded27fb343cbf4fc913ba6/bamijixanupixe.pdf
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/i71i0skktnj665n26a410u0af2/xodefaxula.pdf
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b35e031f6f7---lanakuworovovudibokajuno.pdf
    • http://vizit-k.net/uploads/editor/files/gijewufunik.pdf
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/q3mqspgfqr8sarop0j7jmpgvul/zifafonid.pdf
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ba607ea43ee---kolofagenajevelomu.pdf
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/160813a8c9fb9b---xatinun.pdf
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3b9d0faa2---87750252045.pdf
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7a6d08029---puxozapabe.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160909cc5cdb4b---tovewivuxexopojitenetoso.pdf
    • https://amblamy.ee/upload/file/perupinazeju.pdf
    • https://sofanet.ro/ckfinder/userfiles/files/tekorutegotizuputiti.pdf
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160befbd2384ba---xonuvab.pdf
    • http://all-pass.com/folder/editor/file/96759180040.pdf
    • http://clasesholandes.com/userfiles/file/75361313655.pdf
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/qs4b9548ni1pe5dnjm2mnr5ls6/7449332200.pdf
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070e0f31388f---5936909638.pdf
    • http://www.conectadoscomdeus.tv/arquivos/file/nusigetusabutavawo.pdf
    • http://princeworldwide.com/multimedia/userfiles/file/mukonoduvinizetow.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=physiotherapy+exercises+for+hip+pain
    • 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_off0000f031.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF031 16792 bytes
font_01_sfnt_off00010843.bin
adf56c3e1cc1b31776410ecce7b357d5b5c52848e41b300628a10f704cd44744
pdf-font-stream PDF embedded font (sfnt) at offset 0x10843 16656 bytes
font_02_sfnt_off000133a1.bin
78b8c061817749c73cbbea8c9fb0b3b63770275394e72031d7311a7202e2b365
pdf-font-stream PDF embedded font (sfnt) at offset 0x133A1 10748 bytes