Malicious PDF — malware analysis report

Static analysis result for SHA-256 a465b776ef522f0c…

MALICIOUS

PDF

155.7 KB Created: 2021-06-17 08:04:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 32303d47a7238edefdd5b64d9257c3b0 SHA-1: 5feed9eb738be3bd9c45a0d20bc032249dabdb02 SHA-256: a465b776ef522f0c0377385b13f775bb88ef236e98c5e23be85c7dc797e6aa92
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains numerous external links, many pointing to compromised CMS upload directories, suggesting a tactic to distribute further malicious content or phish users. The document body, though heavily obfuscated, contains references to 'Clash champs th10 base' and application details, likely serving as a lure to encourage clicks on the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://crysiq.ru/uplcv?utm_term=clash+champs+th10+base PDF link annotation
    • http://budohurtsa.pl/userfiles/file/20550456198.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/84ef0b69c47846f384dc523455213935/67304346883.pdfIn PDF document text
    • http://busanpc1.com/upload/fckeditor/file/mabatinumu.pdfIn PDF document text
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/5fb94e98f264eaabdf5a87ba5a8a7bed/bonasenox.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/42230749603.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/5743f46bec60de10b570447dcd833e3a/61895892203.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090e9a2bfb9a---73545324503.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/da5vgsihpu7sai6e735rvgqdqm/83861444859.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/df51v8pgsvou1e91ein6hs42pc/pefowibewimukajezefo.pdfIn PDF document text
    • https://wrd13.com/force/file/2300879141.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b588ed9f460---gesanerurudiruture.pdfIn PDF document text
    • https://hosvagyok.hu/userfiles/file/bebaterolodasigaroloj.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/79bofkpavhehvvml7pliqkqnck/zisoguxedo.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/6man2ajrj146517ts3qv1p4s5h/xoxirepamo.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d6a33c7109---zujakukarek.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609271e9d2990---dutamabaxe.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076d747628e4---50588567528.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e96d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE96D 99484 bytes
SHA-256: 1f47e4210d5393f6595dab28f86b603b9d36247d4752971768488750df38efad
font_01_sfnt_off000212c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x212C6 5316 bytes
SHA-256: 295769198774302a57581703c842bca85357b11142b70c46ab6cbfb051363811
font_02_sfnt_off000224b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x224B1 10580 bytes
SHA-256: 0bd0003d72bd5252bce40781944a29e943475b00821d160665a08bec03f14ea9
font_03_sfnt_off000248a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x248A4 16160 bytes
SHA-256: 5446d8693f472ebe56539db1294e6b993809411a69d567c9d8907fa578c39aa0

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