Malicious PDF — malware analysis report

Static analysis result for SHA-256 10329a8c5d0ae328…

MALICIOUS

PDF

97.5 KB Created: 2021-07-01 22:55:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 7d0adcd5e7d9b865fb89b77c1ac45304 SHA-1: e02170ad0989d77c07a73c68c19803229961efd8 SHA-256: 10329a8c5d0ae32840ef1c3242a46e72f787f8f6e4c6f71ad9c183bdfcf5d413
156 Risk Score

Malware Insights

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

The PDF file contains numerous links pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b330271b660---delakinoxasogakitupere.pdf In PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4a4465b26b55c09e7a5e0c40122e0cea/wazexuxasokevopinefezikuk.pdfIn PDF document text
    • https://beaszemin.com/files/kizosa.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e32a14bbb---nujuboxeboj.pdfIn PDF document text
    • http://chiengthai.com/file_media/file_image/file/jamabuveg.pdfIn PDF document text
    • https://bselink.com/userfiles/file/39211056190.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607db7e62b7ce---vovubovudubidupafiv.pdfIn PDF document text
    • http://rogo-rotterdam.nl/files/92605114704.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/ikpdkii9l4ia93msab8v6lfoi3/rikiwago.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/0cedab393f910570b9704531c4259c25/noroguwimupasajukekuvug.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/174f83dea7445eb1413de664924994df/gutelej.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/ea02a8ad47900e8c8ce784f8c2033880/79807405987.pdfIn PDF document text
    • http://xn--d1achljw0b.xn--p1ai/content/upload/53343439990.pdfIn PDF document text
    • https://cafe-malaysia.com/contents/file/sewovuramadirigami.pdfIn PDF document text
    • https://safrano.pl/userfiles/file/tovukodagazefifanu.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/fe24381ac3dda3bdf4c25bcd2a55b591/jivuzanil.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/60508682622.pdfIn PDF document text
    • http://gwhs79.com/clients/867100/File/kasam.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d22ef486ff---fofatuduzakosaginewix.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8232c085df---68685981116.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609a9ae9549b4---92567257525.pdfIn PDF document text
    • http://www.aluvascientific.com/UserFiles/file/53878694545.pdfIn PDF document text
    • http://xn--939a66v0zjo3bcvdmrp.com/data/ckfinder/files/79114708219.pdfIn PDF document text
    • https://akvaguru.hu/user/file/4812632178.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=one+two+three+in+different+languagesPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f8a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000110bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110BC 10844 bytes
SHA-256: d6e612779b6f54cd188ecbcf5db172f3c35992d88f36cee2169b3c98dd3095d6
font_02_sfnt_off0001298b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1298B 6992 bytes
SHA-256: 2bc6166bc3b1b18bebefd11277a4ddea9ecf4a9f5363ad417f61ef9b0c5ba071
font_03_sfnt_off0001413c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1413C 24900 bytes
SHA-256: 91bf617df9a31c2d2af974f00e108a2f2bcbff549c96893a58516863f84a6ed0

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