Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d8cb8c9cc61fba5…

MALICIOUS

PDF

91.6 KB Created: 2021-07-16 03:07:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 38d2c0a0dc03063871a7498c785a5f20 SHA-1: e23fbc053a35d8ae2e4222a0545d99820328d6aa SHA-256: 6d8cb8c9cc61fba5e23c225e64a18d6e2e306d23b2c144abbebc5de53ed9a089
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm or phishing lure. The presence of embedded JavaScript, though not fully detailed, further supports the potential for malicious actions such as downloading secondary payloads or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://laborke.ru/uplcv?utm_term=hottest+month+of+summer PDF link annotation
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/74e081338a75941ee423de80fb871288/17481600920.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/160782a7c6867f---puwiwuvajuzasamokonovipuv.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a63efeee03f---buzifivowuwelubige.pdfIn PDF document text
    • http://18554080.com/userfiles/file/vuginaguwefopoforak.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/3e8aff7d9466879a67767fe4673a2885/93734781560.pdfIn PDF document text
    • http://goldway.jp/upload/board/file/giwuruvunutovusuvab.pdfIn PDF document text
    • http://murielbellhomes.com/userfiles/files/7256321089.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/j3m205brois4sfv426bqpev7oo/nuvanezuwufos.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f381200c87---27681132041.pdfIn PDF document text
    • https://codecs.roimages/file/jumiti.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fcc1d09c1b---xenomiveguzefi.pdfIn PDF document text
    • http://wolfroccatiassociati.it/userfiles/files/88744849514.pdfIn PDF document text
    • https://eltonltd.ru/sites/default/files/uploads/sujomidapadotopatotowoku.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160716a6aa2687---46718112207.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8b1282b247---xitolubukiboti.pdfIn PDF document text
    • http://dokumsuzgec.com/userfiles/files/gepubuliromeregifanef.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ba06e146087---72487130543.pdfIn PDF document text
    • http://vitajeans.com/ckfinder/userfiles/files/60930613564.pdfIn PDF document text
    • http://firstcuwire.com/file_media/file_image/file/67342587053.pdfIn PDF document text
    • http://tryinvest.eu/userfiles/files/8327866017.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6eaf6af369---xevilujorakevoxuvuvozorex.pdfIn PDF document text
    • https://relans-nn.ru/images/docs/file/18122011285.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_off00010436.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10436 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011c48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C48 17212 bytes
SHA-256: 2ae4f0c66f8b050cb4c7d430ceb5729480a5cdda068fd71666fbcb5bf66e206e
font_02_sfnt_off00014903.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14903 10268 bytes
SHA-256: 1af7613e52809f549b67bf18019220907418a18b712ddc0f8446637c6caf8efd

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