Malicious PDF — malware analysis report

Static analysis result for SHA-256 925e92d7ea0aa3e1…

MALICIOUS

PDF

88.8 KB Created: 2021-07-24 02:49:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b79c92abc8d53b31c28ed66d6ccda570 SHA-1: 74172d6c99e34aeee1ed3f089f14ec5435f3586b SHA-256: 925e92d7ea0aa3e1ed6992d9b3dd942bc58a29e4c96c9fa0e73348c3ac2bab4c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. It also features a link farm pointing to compromised WordPress upload directories, suggesting an attempt to host malicious files or redirect users to phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609820ccbbfa5---vazezurez.pdf In PDF document text
    • http://szsahsh.com/uploads/files/mepogowolasa.pdfIn PDF document text
    • http://www.ettermanenterprises.com/ckfinder/userfiles/files/92082556519.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a63d9788208---mezegiroderoki.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16087d1dd9632a---mijiwavijulapenuxo.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/2077gllq81q0b939de9nl8ag8e/6642364589.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607076a136516---jadewapugoxeti.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160ab48eca4dd5---xoxobofefu.pdfIn PDF document text
    • http://gulfcoolcontracting.com/uploads/userfiles/file/file/vunimepukajo.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ae7b580d2db---44727174119.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/dedol.pdfIn PDF document text
    • http://emannsltd.com/userfiles/vesamapaku.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a84c1a826b9---wudikezuwodet.pdfIn PDF document text
    • http://arserwood.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/2106061047366198041gjpkx.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af59f350ad0---detizalawis.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/xezap.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/fc88b40e6309bd7a7210d80d892e8cbc/kunozumi.pdfIn PDF document text
    • http://taiwanglassgroup.cn/userfiles/file/kibofigode.pdfIn PDF document text
    • https://pbchistoryonline.org/uploads/file/gokusufovasusufoxelida.pdfIn PDF document text
    • http://straub-online.ch/userfiles/files/50659085221.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16096b9e26b4f0---20391468145.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/4af187c42f2648d908679c688825d92d/54489538758.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/69497843826.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079ec4ec1425---kedezevuxiwovejo.pdfIn PDF document text
    • http://stphilomenaonline.org/userfiles/file/29364191733.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=update+android+on+samsung+tab+3PDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f12d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF12D 19540 bytes
SHA-256: 7aa51c1aa70c28e4063ca01f249f49bc70c86715dab2449b36ecbdc361ce8385
font_01_sfnt_off00012411.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12411 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013c28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C28 11108 bytes
SHA-256: 6f01502abb8ff67fd2b2946398a96b3fc64bb17865580df1774d75f6ba8e47ee

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