Malicious PDF — malware analysis report

Static analysis result for SHA-256 33e875ba31a8eaeb…

MALICIOUS

PDF

70.8 KB Created: 2021-09-06 10:08:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 42d35114506308205e0abc850aae93d9 SHA-1: fa202e863d03698e1d92aee3fe7c10b2105a7260 SHA-256: 33e875ba31a8eaebed6ea4a5b2369a2acd00dcfdc8960677e994b721276d978b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document exhibits characteristics of a phishing lure, indicated by numerous links to compromised WordPress sites and disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious or phishing content. While no scripts were directly extracted, the structure and URL patterns are consistent with malware distribution or credential harvesting campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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 https://smidgel.ru/uplcv?utm_term=nautilus+fitness+equipment+manuals PDF link annotation
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c8dc2938ca8---82469704701.pdfIn PDF document text
    • http://csc0731.com/userfiles/file/20210719213558_ponoo6.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a495170cf1a---fezoludovixifira.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16088253f1e229---jevijawizezipimuvafaper.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/f6621f4e9369b42f3fe6701d5fc96959/54361320700.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612a767777342---66578091738.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/b9573ccdb04f3274b1be8b11ec0dec04/bomajixodun.pdfIn PDF document text
    • http://gpsputhuppally.com/userfiles/file/13025277040.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/dcd0f53724da99f511f11bb2b9bdc24a/33615863244.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c84c4130efc---judutafex.pdfIn PDF document text
    • https://subarini.ro/mm/file/jazugelazofeteposuxuf.pdfIn PDF document text
    • https://hophamthaibinh.com/upload/files/webugukudesezepumizizeto.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/b25b037e0d375ea43fb5e7a81117ccc3/wokulijifamikedolimokabu.pdfIn PDF document text
    • https://urbanlivin.lu/userfiles/files/19311247885.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/97384724232.pdfIn PDF document text
    • https://skinrepublic.vn/webroot/img/files/sibezekinukuti.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16075921b9bfea---jurosifosobezurij.pdfIn PDF document text
    • http://gelikonline.ru/content/Files/lepenuj.pdfIn PDF document text
    • https://isitekmuhendislik.com/userfiles/file/fusifidubajajikunufalipo.pdfIn PDF document text
    • https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/f2361e553b9f2ad175f314433a2d1038/38527889676.pdfIn PDF document text
    • http://hondasushi.com/uploads/files/talud.pdfIn PDF document text
    • http://kwiatmetal.pl/userfiles/file/vinepu.pdfIn PDF document text
    • https://zlato-eu.sk/upload/files/14155937396.pdfIn PDF document text
    • http://www.oiseaubleu-promo.fr/userfiles/file/sobovuxojofibexefameg.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/qfiqc39qqkf9hf6cmfd6o93e94/xiwidenefokipisawon.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/4077ba860606ce7b02f78ac85452a621/sevedefujowetuteli.pdfIn PDF document text
    • http://amblesidewindermere.ca/fckuploads/images/file/75017551979.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_off0000b909.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB909 10520 bytes
SHA-256: a2c5955f8d0e7e47df8292c4e83fa5b837cb711d76bef2d8caac16b695a33da6
font_01_sfnt_off0000d0e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0E8 14480 bytes
SHA-256: 16bc6e311775c251fe0ee67f282cb8bf785858b50f413142b1f24d9ff27c5fdc
font_02_sfnt_off0000f4e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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