Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f669305e1d23a49…

MALICIOUS

PDF

101.8 KB Created: 2021-07-21 07:41:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 8ae7e7313b9fa2f4593ca5c0478928e0 SHA-1: fc6b35cad02b634c3810dc1ec9fc3bb64fdab484 SHA-256: 8f669305e1d23a4982bbdb17d8e10d378cb3b7570e4eadd7e38f37bebb95bec3
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to numerous URLs, many hosted on compromised CMS upload storage and disposable domains. This behavior is indicative of a phishing or malware distribution campaign, likely delivered as a spearphishing attachment. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 http://collectifff.be/imgdb/accueil/files/85397840529.pdf In PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/ck6h0b945fj5fs3pb6k4rr75v6/98277914211.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/16089671a4e8df---bedokanunobo.pdfIn PDF document text
    • http://maslag.eu/userfiles/file/88308494540.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/1c871668f2555fa39e4e8e1e3f8f1e47/xizavidufonozuwex.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/pcfo9cidauhh27c9igbfaekg02/6782025228.pdfIn PDF document text
    • https://aspit.ro/imagini_ws/zinasowogumiw.pdfIn PDF document text
    • http://aircond.md/upload_fck/file/23868926505.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0c501bfbf6---vajawa.pdfIn PDF document text
    • https://secolink.sk/userfiles/file/22172065073.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/c62b2ccfd1fd357adc4f5d71c1d7dea7/61823640815.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/cfe4a7d36b0158c28f14de803cb2444c/70256000808.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b5f91cb2877---sotuwodovuvabidedupepe.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/rofigegag.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084aa755d859---14400606572.pdfIn PDF document text
    • http://iccarrentals.com/files/file/zagepidupilumewutilaz.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/a67ki8n30gfa18sikuikb35ccl/15046351262.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/mowujaji.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e0ba596521---zedubemir.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f3e49be8f7---viguwisum.pdfIn PDF document text
    • http://kangs78.com/clients/66216/File/vixavobe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=brittany+poodle+mix+puppies+for+salePDF 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_off000129f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129F3 11028 bytes
SHA-256: e5ab94abfe2b8143f886b93bc91a32a1c569c11ed4903ef898c97f0a84a09738
font_01_sfnt_off000143ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015bbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BBE 17212 bytes
SHA-256: df187c8e88cc43edd2408e62a63bce1393fce911d1b1d35b36b9feffc681ba64

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