Malicious PDF — malware analysis report

Static analysis result for SHA-256 4576ef48e76861d9…

MALICIOUS

PDF

82.1 KB Created: 2021-06-10 17:51:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: ff9441d9e8170c2643cf76aaf6467107 SHA-1: 4b902a9baf03bafa1031f533adabbb1c6328a19f SHA-256: 4576ef48e76861d984950fdbcd4b89c296cc01a58d941b12e248f8a2ed6c9842
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://smidgel.ru/uplcv?utm_term=kingdoms+of+amalur+cheat PDF link annotation
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/d6091f1aecebac7362318d148e0fa3bc/rirenibelalubuni.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/230adb7a60587c13b1c1bafd48743e06/3366801982.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a470c5f3a60---lulukewugunen.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/e0ad4717a291b90fbfa54744a39441bb/tifibekizogitamegixa.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1609b01e8db729---kodiwo.pdfIn PDF document text
    • https://naoshima-habitant.com/46090469790.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/0b6308c50ba0e8d1b32404ee92abfa01/fowexesorepuzutukit.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/r31bpaa0u7p2vs1f3d9vluosv2/jejadupis.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac2801982f---86160264280.pdfIn PDF document text
    • http://slsnn.ru/content/files/96877076005.pdfIn PDF document text
    • https://capitaleny.com/wp-content/plugins/super-forms/uploads/php/files/537307414b0dc37aed599573bfb21e52/vuxaripubin.pdfIn PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/ae56301656f1a31f6f925f64a167d362/gijebapokuxenobez.pdfIn PDF document text
    • http://christopherdallo.com/file/ruzutuxilonuvapimo.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/f75902881ebe1554fae6875f5e94899f/56649442988.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/82846769915.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f79f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF79F 5284 bytes
SHA-256: a58b57ca793cf38eb0b7a6a391930f81bbf5578c8d86ab02baa1e0f0aedfd647
font_01_sfnt_off00010965.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10965 10568 bytes
SHA-256: 92406458cf9dd1c52fd2bfd8886ca7a1dd40ee999657a5642e55c3bb80f9b934
font_02_sfnt_off00012d83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D83 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e