Malicious PDF — malware analysis report

Static analysis result for SHA-256 0407c7fa033b556a…

MALICIOUS

PDF

82.8 KB Created: 2021-08-01 00:36:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bfc0f7cf64af47495a7adda396e29cee SHA-1: bceae276958f5694470967546ea6efc5955ad447 SHA-256: 0407c7fa033b556aa851e54429d2fdfa04edf35b2e746b81b8a60065bb10b839
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, with heuristics indicating embedded JavaScript and a link farm structure. The embedded JavaScript is likely used to execute malicious code or redirect the user to a phishing site. The link farm points to multiple distinct hosts, many of which appear to be compromised WordPress installations, suggesting a distribution mechanism for further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://binhvi.com/upload/files/xowexolisa.pdf
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c8c887a2fa---45482237330.pdf
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/0j0o7b84qolhnruo9hnbvfste2/tifalavifuzosulemawed.pdf
    • https://freebcard.com/ckfinder/userfiles/files/reronodazolufudez.pdf
    • https://actor-conseil.com/files/file/fekunovaxi.pdf
    • https://thingstodobahrain.net/ckfinder/userfiles/files/57717102490.pdf
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070c67c5f375---rogasezururaw.pdf
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607c29e847a2b---15774030406.pdf
    • http://mclarenquartz.in/ci/userfiles/files/28785544861.pdf
    • http://weddingdiy.cc/uploadfiles/files/20210603_104628_8776.pdf
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/7bf11e4b65110ac739e95d445d1fa019/64087932361.pdf
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fe3ca587a7---pexajukukalap.pdf
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e75e257ca47---burubug.pdf
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/7umn908ugkm0cr4rpbi8gdtk7l/62684831207.pdf
    • http://simkoongschool.com/uploads/editer/files/xemovubusimivebo.pdf
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608081f6e0c17---23120122572.pdf
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/b15c8609aa081be59f19968f1222ea90/23131724824.pdf
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16100157a409ea---69179776772.pdf
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/49988437366.pdf
    • https://anthonygillant.com/userfiles/file/xejexomazud.pdf
    • https://registracijakoncar.com/webroot/js/ckfinder/userfiles/files/20077733536.pdf
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2a30b49a77---bikavanixosiz.pdf
    • https://kogan-photo.ru/wp-content/plugins/super-forms/uploads/php/files/f43cc92d8517e6465b5bb4ee7eed90e4/56317752407.pdf
    • http://abwcrainhwy.com/uploads/files/fisuxopara.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=ejercicios+de+la+reproducci%C3%B3n+humana+6+primaria+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_off0000da9d.bin
752821788b6d1905767fc4c9657b0fc4bf3bd03649ff692b252dc9afc96e8d88
pdf-font-stream PDF embedded font (sfnt) at offset 0xDA9D 18192 bytes
font_01_sfnt_off000108a7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x108A7 16792 bytes
font_02_sfnt_off000120be.bin
37433dea1b14ab0df50df049ae024105dd59b50342d7655585639ecccb0ecaca
pdf-font-stream PDF embedded font (sfnt) at offset 0x120BE 11304 bytes