Malicious PDF — malware analysis report

Static analysis result for SHA-256 374616b003e97f4e…

MALICIOUS

PDF

85.2 KB Created: 2021-08-26 08:18:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9d3e52c03d9c73b2e1cab279408b24f5 SHA-1: 8f99f561faf8383595884452bd18c9f3f79f9c6e SHA-256: 374616b003e97f4ebef9ba5fde121fc1a7899212e48c3edf844b3b536121328f
156 Risk Score

Malware Insights

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

The PDF file contains a link farm directing users to multiple external URLs, several of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious content or phishing sites. No scripts were extracted, and the document body was unreadable, but the URL analysis and heuristic firings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://abwlondonblvd.com/uploads/files/dapajovenurajogolirup.pdf In PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/47101309805.pdfIn PDF document text
    • https://tw-itemaos.com/ckfinder/userfiles/files/nakalafapolevododes.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/js91fkkicv4n7ohbngmu6snibn/551328047.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/c948edc4de0ace9a8218d4e10b2239c9/51672501308.pdfIn PDF document text
    • https://samudra99.com/contents//files/sematuresevuzalazinix.pdfIn PDF document text
    • https://jordan.si/dokumenti/file/sitekamasafu.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/2e1d0cf7d27c0e9eb679ebc5b609b318/suxenazuluberivamu.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0ae71d989---17271259424.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/vnknqc61bp6imvcbgifdb352a7/mozezazoz.pdfIn PDF document text
    • https://kede.org/userfiles/file/janewubuji.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16124bfb761eae---kujiwume.pdfIn PDF document text
    • http://www.ecostroyservis.ru/File/dimeniresovajafakepomo.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210505142400_647669123.pdfIn PDF document text
    • http://hy-concrete.ru/d/files/rolajipep.pdfIn PDF document text
    • http://ithaca1962.com/clients/41687/File/28799540468.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/risifaxorilizosimot.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/6e503910efbe45aaadd256ca78518f41/68780237285.pdfIn PDF document text
    • https://elektrona.cz/files/file/37882865659.pdfIn PDF document text
    • http://vietxetai.com/wp-content/plugins/super-forms/uploads/php/files/n5kd7jeirbqv5idf3ippv5imdn/55298827419.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/mifegolafitivojagopezetob.pdfIn PDF document text
    • http://ed-web.cz/userfilesfile/32627319346.pdfIn PDF document text
    • http://taiwangallant.com/uploads//files/202108041826158495.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=deaths+of+despair+and+the+future+of+capitalism+pdf+downloadPDF 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_off0000e3f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F7 18488 bytes
SHA-256: d978690575805fdc14baf630a15af0960d0f35796f2c1b6d62a7daa8fbcc8611
font_01_sfnt_off0001133d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1133D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B54 11072 bytes
SHA-256: c6861d56de21ef572c759a3582afe624f31aa4d907bbf9202d92d14f04bb7570

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