Malicious PDF — malware analysis report

Static analysis result for SHA-256 56a91c749e94f604…

MALICIOUS

PDF

83.1 KB Created: 2021-06-19 05:42:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: a216739bda03f678b864f428d4ae477b SHA-1: 0b1eb48d4f67b1662abb08f6ba7e4c160eedd7ab SHA-256: 56a91c749e94f60453c9fc73fa150c7c00ed9c0ba90b76de56f5d7f578132f8d
196 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF was flagged by a machine learning classifier and ClamAV as malicious, exhibiting characteristics of a phishing or trojan delivery mechanism. The document contains a 'Clipboard command execution lure', instructing the user to copy and paste content into a shell, which is a common technique to bypass security controls and execute malicious commands. Multiple URLs hosted on compromised or disposable domains were extracted, suggesting a link farm designed to redirect users to malicious content or download further stages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://davaocarrental.com/images/file/91488927106.pdf In PDF document text
    • https://isleo.com/i_photos/file/1389760984.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/b4c055b1e920cf770e9a8b305ebcd3d5/75803624558.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607215b3794dd---55077603165.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4c3ad6221---6491911183.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160705db19dbba---nevozip.pdfIn PDF document text
    • http://ats-dz.com/userfiles/file/xetejisuz.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607dce09c090a---18924805539.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/f2e78ca52833d59f3f7c260ae435d5e4/19884737071.pdfIn PDF document text
    • https://digidatadecolombia.com/wp-content/plugins/super-forms/uploads/php/files/a967e4b8cd3b68f007bea35860bde4fb/jirutotosu.pdfIn PDF document text
    • http://vksraja.in/fckeditor/upload/file/gujepipelujatu.pdfIn PDF document text
    • https://cottonweb.net/userfiles/file/xebodutikujesajawujaj.pdfIn PDF document text
    • https://textosolutionslinguistiques.ca/upload/editor/file/92089511942.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/m7rmt1ji9nmank5s68jkellqml/4649698935.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/80d931dc674cb22679206d2fc99d785e/nisevuvifinudub.pdfIn PDF document text
    • http://ilturismoinitalia.it/userfiles/files/46150026230.pdfIn PDF document text
    • https://prospr.fr/ckfinder/userfiles/files/rowidamejeradukariko.pdfIn PDF document text
    • http://studioprogettoarchitettura.eu/userfiles/files/goseg.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=compress+pdf+terminal+macPDF 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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000def5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF5 6588 bytes
SHA-256: b3260a8b27c40a1c9408c40b3dcfb9ec9ded560232013cbc1ca8de37ebb5a831
font_01_sfnt_off0000ef6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF6F 5208 bytes
SHA-256: 5f38d1570969e619b5f66154357cab4c1b5c9834e695636b65bb6d47d420fbf1
font_02_sfnt_off00010105.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10105 11696 bytes
SHA-256: c912aa2ab79a37763a67e20502bc2c6e67e9a979eed1d83d0221d8c766642764
font_03_sfnt_off00012908.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12908 16384 bytes
SHA-256: fb2ac63fb075d256b5587570191ecec806cb29c29da4ebedfc8653ce907d9040

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