Malicious PDF — malware analysis report

Static analysis result for SHA-256 866d760b41dab635…

MALICIOUS

PDF

86.5 KB Created: 2021-09-05 00:55:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b4dcf299921bab551a60014add99bbaa SHA-1: a63121c1b1b131116810e2af64069ca9fed15140 SHA-256: 866d760b41dab6350f49ef5f89c0520fbafcd8611aceeeacc6e210130ac04c27
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also features a large number of external links, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://grandviewgroupresort.com/upload/files/80761083019.pdf In PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611b700f47f4e---40810779633.pdfIn PDF document text
    • http://sochisushi.nl/survey/userfiles/files/85519687461.pdfIn PDF document text
    • https://cuacuonbentre.com/upload/files/66438959897.pdfIn PDF document text
    • https://geneolock.com/locktactyuma/userfiles/file/97635908774.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160da4ed67e715---76523076356.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a3ec5777edf---zugaxufisakopimirufas.pdfIn PDF document text
    • https://takipcisec.com/calisma2/files/uploads/70668289519.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/56148736841.pdfIn PDF document text
    • http://www.johnrealestate.in/ckeditor-ckfinder-integration/uploads/files/79632383795.pdfIn PDF document text
    • https://akanaymatbaa.com/calisma2/files/uploads/gamebenevopek.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/1i7u6q5ahuo2eddtkb4sjq1ek6/22099775619.pdfIn PDF document text
    • http://taiyoaquris.cn/upload/userfiles/files/20210811123348.pdfIn PDF document text
    • http://keyflounge.nl/userfiles/file/79880369491.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/0fc6d8ef615602d57917795b69f18aee/vupuruxenam.pdfIn PDF document text
    • http://auburn-companies.com/userfiles/files/vigunexujabojetojuzofu.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/16108f05e90b9e---26881191427.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/160cd6a69883b0---51111281791.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/49435a7aeddec98f97da94f8dcdbada8/daxudavupevetabexu.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/6995ca6e65ddb8227d92029b3fd6c0f6/34434788676.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca5536b2097---40985698733.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160cc985f88d51---taremedebinisotuxofidig.pdfIn PDF document text
    • https://zhongzing.com/uploads/files/202108190519431953.pdfIn PDF document text
    • http://albarossa.jp/js/upload/files/22284455517.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/48e7b0e5826ba39fad49aa0d588fc5fd/bivazorisotagarat.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a0ac543e3a1---75586954884.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/16093a9836dc75---gijuzepisomupagunewo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=evolis+pebble+4+user+manualPDF 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_off0000ecbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECBF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000104d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104D6 10680 bytes
SHA-256: 488984f7e8e9dc3c5d02f97455a7f65a06655c72647e87045b536633f89c988a
font_02_sfnt_off00011d15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D15 18096 bytes
SHA-256: c3327019a3489141635d73ef409bd560b592767de886079347a08e24464488ed

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