Malicious PDF — malware analysis report

Static analysis result for SHA-256 e46267dad5716790…

MALICIOUS

PDF

77.2 KB Created: 2021-09-05 19:07:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: bd9066081737fe7635ea00f7b8977039 SHA-1: 5d4d287691c6c2de48b5d14b53fbe30bf4f04ae3 SHA-256: e46267dad5716790dddbe690a3d995c554dc1e70f04efacf9d236fcae55850e7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to WordPress sites utilizing form upload plugins, suggesting a link farm or potential exploit delivery mechanism. The presence of multiple PDF link farm heuristics indicates a deliberate attempt to obscure the final destination or leverage compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/43f9ffdf5ed0e04734677424f7e73330/16342534860.pdf In PDF document text
    • http://ferramentabelleggia.it/public/file/63250828675.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609bad30b030c---63249717547.pdfIn PDF document text
    • https://zabulgaria.org/userfiles/file/49326155760.pdfIn PDF document text
    • http://clinicaveterinariabilancino.it/userfiles/files/70055399410.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070cf0ca33a9---78043516488.pdfIn PDF document text
    • http://homearcky.nl/userfiles/file/kiferokawovotusifijatefud.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609b45e72f036---84869334388.pdfIn PDF document text
    • http://xn--80aaffebba2apgigwiiececnggk9e4k.xn--p1ai/pict/file/tijokinoremanadatas.pdfIn PDF document text
    • http://sowa-architekci.pl/userfiles/files/9983168493.pdfIn PDF document text
    • https://tennis94.fr/img/pics/files/45674554150.pdfIn PDF document text
    • http://daehwa.info/uploaded/file/9534553521.pdfIn PDF document text
    • http://gidaero.com/upload/fckeditor/file/wunixafibe.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160886dce7b15e---rufanulipuxewepezex.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/152a7ec2bcbaeef7b1cb1b2a55eb0f4e/55539142932.pdfIn PDF document text
    • http://odnoklassniki-files.ru/images/uploads/files/57880203802.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/vvjvhiogp7o0b1f95qvsudssj3/39756698681.pdfIn PDF document text
    • http://t-eamplus.de/web/editor/files/bumemade.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/a14eeae8adde691ac1b12e9b90e72e17/63941249802.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=exercices+like+love+hate+%2B+ing+pdfPDF 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_off0000c4a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4A6 18664 bytes
SHA-256: 343684efc05a33c29fecdfbd83fd6a099ac4d7995cb73c7c32c23220ca3a4d29
font_01_sfnt_off0000f592.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF592 11140 bytes
SHA-256: 42556cbe12dcd841da7e2c52480d4e6b28d7aac048e48cfeff45f30be9b325b6
font_02_sfnt_off00010f64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F64 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1