Malicious PDF — malware analysis report

Static analysis result for SHA-256 b190a8cef707794f…

MALICIOUS

PDF

93.3 KB Created: 2021-09-04 18:04:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 69016b8bd52fd7b2cadaa32320b9d7d4 SHA-1: 76f171dacf7cd23846e19336d707c1214bbd258a SHA-256: b190a8cef707794f4314e328f1972f62de01ee3b9c841c52eaf75c91a0d0edb3
196 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains heuristics indicating it is a link farm and potentially a phishing or malicious document. Notably, it includes a 'SE_CLIPBOARD_COMMAND_LURE' heuristic, suggesting the document instructs the user to copy and paste content into a command-line interface, a common technique for executing malicious commands or downloading further stages. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://arci-mp.fr/admin/File/17211061315.pdf In PDF document text
    • http://lsphc.com/userfiles/file///xemubetod.pdfIn PDF document text
    • http://melodylavernebettencourt.com/media/file/bewebono.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607125081dd9a---sevezanunugewo.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/7bb3b176a030afaeebeb4a62b250f4c2/93090455282.pdfIn PDF document text
    • http://npas.ru/pic/file/79389116159.pdfIn PDF document text
    • https://fonixkoncert.hu/upload/file/tiranunusepeve.pdfIn PDF document text
    • https://secolink.sk/userfiles/file/fotizipuxopojasap.pdfIn PDF document text
    • http://ty-universe.com/image/files/20210828_021456.pdfIn PDF document text
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/2d1b72c0d27ce4214460d52221ca3208/nezerikum.pdfIn PDF document text
    • https://shieldtech.cz/ckfinder/userfiles/files/62004380839.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/7e3a7f4ae40747fee0bdb9d55612ff93/13123047920.pdfIn PDF document text
    • http://www.supair-lux.hu/ckfinder/userfiles/files/5364184214.pdfIn PDF document text
    • http://hurtglass.pl/upload/file/lumija.pdfIn PDF document text
    • http://jfac.kr/ckfinder/userfiles/files/jirazobozulanadevis.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/7a592db85c383736381628608ff3d744/bifixedorug.pdfIn PDF document text
    • http://bilmatbasim.com/userfiles/file/pupek.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1606c96009245c---9723934621.pdfIn PDF document text
    • http://josephpowellfamilyreunion.com/clients/0/04/04c15d356d3082020e114f8c0300f46e/File/padumedopugizatezujano.pdfIn PDF document text
    • http://ogbchurch.com/clients/880797/File/kelew.pdfIn PDF document text
    • https://medosojewellery.com/userfiles/files/ziwesujavinetil.pdfIn PDF document text
    • https://acavacecio.it/userfiles/files/boxobovonokivugamajilufe.pdfIn PDF document text
    • http://villapellegrino.it/userfiles/files/nagajiref.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=laravel+documentation+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_off00010573.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10573 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011d85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D85 18940 bytes
SHA-256: 9772e450893e207e9e6e5b43b983b4f96792aa543cec2890918be3e08667f6e0
font_02_sfnt_off00014f7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F7B 10736 bytes
SHA-256: c4e9b7748676f7d31d35c9db99b9a1375a0363ce4e6392c13d07db065cc76ac6

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