Malicious PDF — malware analysis report

Static analysis result for SHA-256 242945e4d3cadf2c…

MALICIOUS

PDF

131.5 KB Created: 2021-07-13 12:09:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: ee5c7d7c8cb8164f19cf0d8156e4e4b4 SHA-1: 8cc0c1c50103d8963216e01d3fa420e95dcd83cd SHA-256: 242945e4d3cadf2c48136b75d22ed1c03ede44210db10886d015d810568500d1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many pointing to compromised WordPress sites and disposable hosting, indicative of a link farm. ClamAV detected this file as 'Pdf.Phishing.Trojan', and ML classifiers also flagged it as malicious. The primary function appears to be directing users to potentially malicious or SEO-manipulated content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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 https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/2ca6f6b59091529fa9789952f4613a3e/46718748050.pdf In PDF document text
    • https://tsegypt.com/file/46764147343.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e92743d4dab---65117975400.pdfIn PDF document text
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/4pib0ig9lc8lnb0a55s7rvd4hv/33578541044.pdfIn PDF document text
    • http://pcccphucvinh.com/upload/files/bojirunulim.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/e45344f4c15c81c249d7dd0ccfb710da/ribenutovejisevi.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/e08c6be85daa072f55ff0e5494bc07d6/xokubibezakufelurafuzi.pdfIn PDF document text
    • https://elbag.net/wp-content/plugins/super-forms/uploads/php/files/571f9cf881bf51b5a2594232ac0c9649/xobemikolewopovo.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/16093a98e7df82---rodemopu.pdfIn PDF document text
    • http://peggylittlelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wudag.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080ec7765177---saremol.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/21732783397.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/d343a2974a27210bfd427f25f6781943/16922094287.pdfIn PDF document text
    • https://koratspring.com/upload/file/laribogimosapesosemupi.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/fbd2ee325a6228894715efcf69efe6bf/pinipel.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/a829730b45c49309abf071137c2e981f/97007608226.pdfIn PDF document text
    • https://osakadentalcare.com/contents//files/zepoxerujidusavumewisixa.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/kb4ipdkuroo1jevk8oe2hivhlm/jilomiwexamefenapu.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfc2b55b5c---20702087965.pdfIn PDF document text
    • http://secohthailand.com/file_media/file_image/file/kebugibozaxesate.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160825b8162a58---tufimopofuzifaz.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abab279fdc5---19966094620.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a8934518862---kadabozolabatixuwev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=difference+between+second+and+third+wave+feminismPDF 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_off0001a0d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A0D0 17512 bytes
SHA-256: 4ff6daa6a23d5b866554d8170e2d53915af0b7ff1c375f974c68bd33cf5b2fb7
font_01_sfnt_off0001cea2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CEA2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001e6b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E6B9 10988 bytes
SHA-256: 6a30ba2113be353034139d07568b7ae97345667087d32686fcbd295ce1bdca2d