Malicious PDF — malware analysis report

Static analysis result for SHA-256 16c95da12eeb11b5…

MALICIOUS

PDF

93.4 KB Created: 2021-08-04 01:01:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 2b936f9ce5c24ab42ebd67d027d94bad SHA-1: 9db66154aba19610b4a7e2890b2ad7f8653fbb17 SHA-256: 16c95da12eeb11b584094727eecfb91598cf00dc5fda4d12db9e54fd7d0c29ba
196 Risk Score

Malware Insights

MITRE ATT&CK
T1059 Command and Scripting Interpreter T1566.001 Spearphishing Attachment

This PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. The presence of a 'Clipboard command execution lure' heuristic indicates the document instructs users to copy and paste content into a shell, a common technique for executing malicious code. Numerous URLs pointing to compromised CMS uploads and disposable hosting suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://pistant.ru/uplcv?utm_term=how+do+i+put+multiple+images+into+one+pdf PDF link annotation
    • http://asfus.net/virgsurv/userfiles/file/birubobix.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/18491591422.pdfIn PDF document text
    • https://we-plus.tw/ckfinder/userfiles/files/16181355662.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/c0c68805b00f0dad1f8e8b0445b3536c/82627612692.pdfIn PDF document text
    • http://studiosantomauro.it/userfiles/files/bidebininivokek.pdfIn PDF document text
    • http://gianphoiduyloimodel.com/Images_upload/files/21148408225.pdfIn PDF document text
    • http://universalestetic.com/userfiles/file/wubunuju.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/e02482c924e159579cfc7f93eb2129fb/gujikejewuda.pdfIn PDF document text
    • https://dammesliepas.lv/ckfinder/userfiles/files/77659428733.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071fa28a1d62---gigaxafilewub.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/6cdb9fcc6f6dafb93d0a87864440cded/sijoxevakusu.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084f3d6d07f8---36531988664.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e4fa8469c53---posalugafufem.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/79d36af9063829f754ae6312e61c5266/47046026480.pdfIn PDF document text
    • http://bodymindspiritconnection.org/clients/5/53/53f1eac0d8ee32431a47b4e1af774f29/File/15262822188.pdfIn PDF document text
    • http://petra-dario.info/upload/datoteke/56722548773.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec1acacdc6---dosolonitimaga.pdfIn PDF document text
    • http://e-kva.ru/admin/ckfinder/userfiles/files/kidazifomukuwigiso.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/a14c90d75fb63630bb39aedf487f2999/93390853194.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/a5e30925a032475a9ac3236bfb5ac75a/85266076906.pdfIn PDF document text
    • https://sabagdasarov.ru/upload/file/napevajunuzorubepalura.pdfIn PDF document text
    • https://atrax.hr/files/zobatavesosepujuvivumo.pdfIn PDF document text
    • https://nutricionintravenosa.com/wp-content/plugins/super-forms/uploads/php/files/4062c8f5c44c52a61cbb302019f81555/disujajuzutixoxevifezebiv.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b79d4cf7aa---sedadojisororod.pdfIn PDF document text
    • 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_off00010548.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10548 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011d5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D5A 18244 bytes
SHA-256: ccccf42aa9a95cd47118ab971530d59f0129192f0a441d4add78cc758635357a
font_02_sfnt_off00014dbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DBB 10920 bytes
SHA-256: b31fbfebec50bcea655400daa89c3aa9d6fae8a19c002faaf188bfcfebec1b26

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