Malicious PDF — malware analysis report

Static analysis result for SHA-256 72d86db31db9fda6…

MALICIOUS

PDF

70.1 KB Created: 2021-06-19 13:27:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 762dd62341262383a89032be49b6f302 SHA-1: b8609e768edb527939e16570e34af838906f40c6 SHA-256: 72d86db31db9fda6bc343201cc94f2cdf0dc9b145080699d90eaa1bc564dbc97
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to distribute malicious files. The embedded URLs and the heuristic firings indicate a phishing or malware distribution scheme disguised as a software download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://asbufestival.com/uploads/FCK_files/file/fizazanarifar.pdf In PDF document text
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/88386068d850df3409ea8cedcad8852e/76429972089.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609a0ce268747---pobuxebabed.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b3b368bdab0---jeditevajereb.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/355a3f3554ab55d369479f5a932a60f0/xefimidobujebazewatazed.pdfIn PDF document text
    • https://gulfsupremesa.com/ckfinder/userfiles/files/66654255124.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/8a41d06f1bebf44ff7132ba7e0351c49/xipedorega.pdfIn PDF document text
    • https://parokisantolukas.org/Uploads/userfiles/files/xenexuwidixawu.pdfIn PDF document text
    • https://serwisnawigacji.pl/userfiles/file/bedepixakugepunitubupigo.pdfIn PDF document text
    • http://cfacgroup.com/uploads/FCK_files/file/depajibu.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/cr9t6jo6j6jjoq9dtnt7dnvldv/wimudibipiputanizowenin.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a283a1a8712---koxejavoboburegugaxo.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/ae5cec88bebc765f05452afabc1e377e/35134406451.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=rufus+2.18+download+for+pcPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d4d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4D4 5656 bytes
SHA-256: 8ccd2ab536933f9cabfc6f1a55f2e21a312cc511eddc724dd8e84cc4d5e4b57a
font_01_sfnt_off0000e84e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE84E 10552 bytes
SHA-256: db63285454b7f1eecfd8ed601d19afea98b095da638ab4b29e1d50fd293ca0be

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