Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bd536f3130e083b…

MALICIOUS

PDF

82.8 KB Created: 2021-09-04 07:58:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c4abc6789b2158c9cdadee0f794af7d4 SHA-1: 37ef4a9967d3dabf6f247255664c2b8ff005ade4 SHA-256: 3bd536f3130e083b3c792f195ec413fc3bf5903ff79afa62040b4e554ef1f1ef
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are part of a link farm hosted on disposable or compromised domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution via these links. The embedded JavaScript may be used to further obfuscate the malicious links or initiate a download.

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://oniceh.ru/uplcv?utm_term=expressions+for+discussion+and+debate+pdf PDF link annotation
    • http://asja-doll.ru/userfiles/file/xibesozitujup.pdfIn PDF document text
    • https://hotellemaritime.com/hotel/upload/files/todimosilirunizemezokisal.pdfIn PDF document text
    • http://weighlessthisyear.com/ckfinder/userfiles/files/xalixuxofavebalo.pdfIn PDF document text
    • https://pt2-turbo-j3t.com/contents//files/nokebemol.pdfIn PDF document text
    • http://frankslawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/99707009594.pdfIn PDF document text
    • http://vasvaripalmuzeum.hu/upload/file/55206499666.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d78445a4386---mopakizeka.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc52ebea72---laloziremalekadivexobiwo.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/6f4c36eb2241f2054838aa9bb4d711a0/gakog.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/80f126a7fa4ac45916e8e5410a2f4be9/jekadujexominaxovikife.pdfIn PDF document text
    • http://denis-lefebvre-services.com/fichiers/file/dabojin.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/66400971568.pdfIn PDF document text
    • https://drsubhashawale.com/ckfinder/userfiles/files/lirozorepomekokakuzivuso.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/4n95rsc7e5u0jmgbssdruvse20/pafusava.pdfIn PDF document text
    • https://pollackmihalyiskola.hu/ckfinder/userfiles/files/pomudezupozudalidetoput.pdfIn PDF document text
    • http://parcfamilyreunion.com/clients/b/b3/b3ae52aef0329bb57e848b27182677c8/File/95737910232.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079aa3015440---fovewipuzaf.pdfIn PDF document text
    • https://www.temtechnologies.fr/ckfinder/userfiles/files/74452926292.pdfIn PDF document text
    • http://konyaozgunmobilya.com/userfiles/file/93473328741.pdfIn PDF document text
    • http://studiomilano.eu/userfiles/files/xuvak.pdfIn PDF document text
    • http://osmed.cz/app/webroot/files/files/72421531797.pdfIn PDF document text
    • https://festival-bg.com/media/ckuploads/files/kizaf.pdfIn PDF document text
    • http://smenergy.kr/uploaded/file/1937400220610b3501652f4.pdfIn PDF document text
    • http://ventiliatoriai.lt/js/ckfinder/userfiles/files/tibogasutakugadi.pdfIn PDF document text
    • http://iucecb.com/files/file/92260780798.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dcf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF4 10892 bytes
SHA-256: 9c726a578db1acc4b48cd306ea8c01f6d0b633dd6879145e225cb5b8be21588c
font_01_sfnt_off0000f615.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF615 17804 bytes
SHA-256: 5753987273201fb71aa15dc79ee7b521c2edb978aef8a49ad15adea211f6d1e1
font_02_sfnt_off000124f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.