Malicious PDF — malware analysis report

Static analysis result for SHA-256 7627b75050ec6f3b…

MALICIOUS

PDF

89.3 KB Created: 2021-07-27 15:19:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a4b7943c11a4017c40e370e1426afe7d SHA-1: bdf4bed1ae40ee4750d5163aec90262a8045597e SHA-256: 7627b75050ec6f3bc3f5f2e625efbfcfb198a7b1186961bda872adc2cdabeafb
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious. A critical heuristic indicates it's a 'Clipboard command execution lure,' instructing the user to copy and paste content into a shell, which is a common technique for executing downloaded payloads. The document also contains numerous links to potentially compromised WordPress sites, suggesting a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/c8af11eb598e42ef9c9fd27750d1eab3/ridibasavobukezaven.pdf In PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1560895515---64604690189.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d962eab94a2---lixazogepodis.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c2e1eb63e2a---sowifafoba.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607c77fab3d79---wikubodasesaxegim.pdfIn PDF document text
    • http://abwcoliseum.com/uploads/files/74160622249.pdfIn PDF document text
    • http://familycrawford.com/clients/3/31/31f1fdc6e90c562b7578e9c437f7c1bf/File/butopasizej.pdfIn PDF document text
    • http://csc0535.com/userfiles/file/20210622175810_b4imej.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6a2213dc8---zutaz.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/4509fd400ad384ed56f48fe1ab6cbb14/81200399392.pdfIn PDF document text
    • http://www.aqsclimited.com/EditorImages/file/rovirolonamujoranenedi.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073a91b8558f---gagomonaxakikimuvapovin.pdfIn PDF document text
    • https://giridhareye.org/ckfinder/userfiles/files/92101610854.pdfIn PDF document text
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/009459a36fa67c6eba9637ded600e701/64711166866.pdfIn PDF document text
    • http://studiofantino.it/userfiles/files/zepalorizizudedola.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/lodede.pdfIn PDF document text
    • http://veronikavilla.hu/userfiles/file/logasoxadurovid.pdfIn PDF document text
    • http://autohondl.cz/userfiles/file/78846080020.pdfIn PDF document text
    • http://www.multigacos.com/admin/uploaded/fck/file/6820269605.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/18c75d636395e119fde11d28d440f2f6/sexejofanitedareko.pdfIn PDF document text
    • http://masseydogs.com/clients/f/fc/fc2e217ffa4851e49ca3cd921a15cf41/File/vogudeka.pdfIn PDF document text
    • http://www.celso.org/download/69825414378.pdfIn PDF document text
    • https://edinburghpools.com/contents//files/90367799854.pdfIn PDF document text
    • http://zs-oilfieldequip.ru/d/files/16578266205.pdfIn PDF document text
    • https://amadesafar.ir/basefile/amadesafarir/files/piwepujizivujabuvome.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=how+to+enter+bios+acer+predatorPDF 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_off0000f6ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6ED 17952 bytes
SHA-256: 09e0808f17b728ef2586b68e090e32039f09e6faf613bf3964717f4e9ccb023e
font_01_sfnt_off000125c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013ddc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DDC 10680 bytes
SHA-256: c1e633c1e5b66ff6260151565966b54785678690d8ee3818abeead8d4c742d6d

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