Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4c97e62a2f61abc…

MALICIOUS

PDF

86.7 KB Created: 2021-07-20 23:56:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: d42c651228d626969d54d00a8899c4ea SHA-1: 3bd858becca8aae0cde38fe092615a0efd442766 SHA-256: e4c97e62a2f61abc576cf2152825af934a95b717a59248cc5e75ccb84133127c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to other PDFs hosted on compromised websites, indicating a link farm designed to distribute malicious content. ClamAV and ML classifiers identified this file as malicious, specifically a phishing trojan. The presence of multiple compromised CMS upload links suggests a coordinated effort to host and distribute malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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 http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071cab84956c---julamuwilagurozatir.pdf In PDF document text
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/nilimotudebivibig.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/594e789ac86b3d504570184216db7284/mesuvafituvonufob.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/6890292ab69f43d57a650f43ea6d7c78/koboguvebev.pdfIn PDF document text
    • https://vannordenvastgoed.nl/userfiles/file/pawujine.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/17888bf159f041bc1b87f002b781d1d8/korekasaguredi.pdfIn PDF document text
    • http://aliotoconsulting.com/clients/862286/File/24844741302.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d73cb967768---wexatumawajuladi.pdfIn PDF document text
    • https://burgaseguros.com/userfiles/file/topipijumopoxa.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a178b0b5fe2---lotarijuxuj.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/1608b6d352261a---56902628977.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec67a624a1---39591922918.pdfIn PDF document text
    • https://matras-matrasych96.ru/admin/ckfinder/userfiles/files/76076165828.pdfIn PDF document text
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/8c2339e0b444eab92fe4f749df1ff165/88510796111.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5cffeec808---senadob.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160f671e87c987---vifufigavipelunafenemar.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/01phpma45kgfpl14j9tc9m6ikn/5650229369.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/kebirurez.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e34eb524180---dadusegabav.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160738f8add360---98824243059.pdfIn PDF document text
    • http://faurerom.com/userfiles/file/6288918488.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=99+aed+to+inrPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/c6379edf51756ba265b56696cebde17d/fanifipafiboji.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE7D 10096 bytes
SHA-256: d267648e2db8f4b0e76a2eee42df14fbe2b2a49b84ad8c11eb2980b4d0345726
font_01_sfnt_off0000f51b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF51B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D2C 16224 bytes
SHA-256: f16fabb0aeb7cb637f0b528602d0ea764a69c63e0d6ffde2c5fa4f8fe93bd876
font_03_sfnt_off00012315.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12315 16752 bytes
SHA-256: 89fb02e2ad53122ae6f55a841dbac2454c5d3cb8da7db25e6f7f80bbd142a9a9

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