Malicious PDF — malware analysis report

Static analysis result for SHA-256 a58d743d11f7859a…

MALICIOUS

PDF

105.2 KB Created: 2021-09-05 14:35:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a4a87b70ad94da68403aca62d6112422 SHA-1: 53996103ed0ee93a27f95d301e35ef99ea55b692 SHA-256: a58d743d11f7859a04a8b606b9c5be131f2131c0ca2d439c72f56e4092fc985b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file contains a link farm pointing to multiple compromised or disposable hosting sites, suggesting an attempt to redirect users to malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/4b563c0f9f63e0f1c026a9ca00ef8392/laritogax.pdf In PDF document text
    • https://tongdaidoanhnghiep.com/app/webroot/upload/files/suloratuke.pdfIn PDF document text
    • https://duvanco.be/docs/files/zonamavesezadi.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/cc6738a27e0b4458752839dd92cbc900/70095557437.pdfIn PDF document text
    • http://orchid-daikanyama.com/userfiles/file/zebosopibe.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/942a07e88382ee5bb0ffed2e111e2fbd/kuxafomisiwixen.pdfIn PDF document text
    • https://highrise.pl/file/kuruxesowanopire.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613345ae1fada---97896144876.pdfIn PDF document text
    • http://mid-europe-ex.com/images/blog/file/21961947579.pdfIn PDF document text
    • http://katyababash.com/images/uploads/file/xodefos.pdfIn PDF document text
    • http://casier-a-bouteilles.fr/file/63775216457.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/j2qn0il9pqvqt46jumh5dgfah3/19722385386.pdfIn PDF document text
    • http://kssi.ir/public/userfiles/file/gomumi.pdfIn PDF document text
    • http://mpti.ru/userfiles/file/97983112762.pdfIn PDF document text
    • http://hillcountryawningsandsunscreens.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084f58696a79---33430515758.pdfIn PDF document text
    • https://casabresciani.it/uploads/file/77454399404.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/6925c692b9531707a2d62f4114bd0680/nixivilof.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/biriponitutipupan.pdfIn PDF document text
    • http://firmykominkowe.pl/Obrazki/edytor/file/7859184545.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607efdf4969f0---53729255820.pdfIn PDF document text
    • http://sns.hu/_user/file/85368955783.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/ca34aaaf003ca7544b1facdbeadba5fb/40564078290.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=taekwondo+kicks+list+pdfPDF 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_off0001350a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1350A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014d21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D21 10652 bytes
SHA-256: 5d88b7007d5cce0962f46928e9cb0bcbc8aa9f108a3b4edcbe9c5c61cfb7dcc1
font_02_sfnt_off000165b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x165B7 19204 bytes
SHA-256: 8cfaab86a6bf4ae7cbb8c3ab93755d0310ee425c9ade05bbe36b6e70cf3c7e2a

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