Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bd8f89eaf152c70…

MALICIOUS

PDF

84.6 KB Created: 2021-09-07 15:26:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9c65c6e3998954b1849301526ea26455 SHA-1: c13031f2f1dae6c55528f471060d52de3ddb00e5 SHA-256: 8bd8f89eaf152c7046aebb13f1e2a493345c895a29b3f5f8336c9b679443c9cf
196 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1566.001 Spearphishing Attachment

This PDF document exhibits malicious behavior, primarily through a 'Clipboard command execution lure' heuristic, indicating it instructs users to copy and paste content into command-line interfaces. The presence of numerous URLs pointing to compromised CMS uploads and link farms suggests a phishing or malware distribution scheme. The ML classifier strongly flagged this PDF as malicious, and ClamAV detected it as 'Pdf.Phishing.Trojan'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://archism.ru/uplcv?utm_term=markdown+to+pdf+atom+package PDF link annotation
    • http://trendstyleimage.com/uploads/ckfinder/userfiles/files/31187972518.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/12119c589aa89a700c10b97754eaf7d3/selabedolub.pdfIn PDF document text
    • http://letsbelegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/38523741727.pdfIn PDF document text
    • http://hferrynetworks.com/FileData/ckfinder/files/20210807_C869DF552E517F4E.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/16088671b355a4---janupejetoxi.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085053fe6f28---xinovetefifowu.pdfIn PDF document text
    • http://candybeauty.vn/upload/files/debowudurasu.pdfIn PDF document text
    • http://ural-resyrs.ru/data/file/19259938554.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b54f8b0aef3---30205513609.pdfIn PDF document text
    • http://xn--d1achljw0b.xn--p1ai/content/upload/najemami.pdfIn PDF document text
    • http://nyett.hk/uploads/news/files/votitofekuwisu.pdfIn PDF document text
    • http://global-leasing-management.com/uf/file/2911618344.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c7229101b21---82088624537.pdfIn PDF document text
    • http://appletechsolutions.com/userfiles/file/vusiledoxam.pdfIn PDF document text
    • https://habibitours.com/ckfinder/userfiles/files/jagunenuw.pdfIn PDF document text
    • https://carcarnet.com/home/sandbox/domains/hkdance.tritek.hk/public_html/ckfinder/userfiles/files/31657852562.pdfIn PDF document text
    • http://ambcavallon.eu/userfiles/files/21940531524.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/f74920e7215d646323a84eccc0c3ddfa/73508475697.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607df42a4c71b---14745602980.pdfIn PDF document text
    • http://tokyosushilohaus.com/uploads/files/57070185191.pdfIn PDF document text
    • https://grandhotelbulgaria.com/userfiles/file/48017011738.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/luwisudolimifamixej.pdfIn PDF document text
    • http://administratieindex.nl/images/uploads/tigizewadilafumatosip.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_off0000e0c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C0 19000 bytes
SHA-256: f640cc1a8b3c0979531ffb113e0dfebf864601b1cc957a3b01900616740399e1
font_01_sfnt_off0001134c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1134C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B63 10828 bytes
SHA-256: 308aeea5e7ca30604e0d255cb0544c6239e910d9bb06e8e0d17f7f32fe1945a9

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