Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ee1601f8a03d5b4…

MALICIOUS

PDF

84.7 KB Created: 2021-08-23 18:42:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a11c8eb9c59ff88669a1375d03629951 SHA-1: 3631c76075c73fe4a979e7145ac9b63d230166a1 SHA-256: 0ee1601f8a03d5b4e946edfe3248a707685c8ccec129bd5b6ec8782261b98d1d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics as containing a link farm hosted on compromised CMS upload directories. The ML classifier and ClamAV also identified it as malicious. While no scripts were explicitly extracted, the presence of numerous URLs pointing to potentially malicious PDF files suggests an attempt to lure users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160781595713b8---70607461256.pdf In PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0de754ce58---kaxeropo.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/e702e515677906bfbae5a5917b867935/sesisivureluzezujemij.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/a5f518c362ad374561e8c2da524906ef/29084829269.pdfIn PDF document text
    • http://vikingpaint.com/user_file/file/sorazopanurumebaz.pdfIn PDF document text
    • https://vnycc.com/userfiles/file/gedawuwimakuzipotob.pdfIn PDF document text
    • http://hoanggiaphatland.com/uploads/image/files/53463086676.pdfIn PDF document text
    • http://duonglaohanoi.com/userfiles/file/kevosazibefakonuro.pdfIn PDF document text
    • https://szekszardportal.hu/userfiles/file/97692462712.pdfIn PDF document text
    • http://daehwa.info/uploaded/file/81585729978.pdfIn PDF document text
    • https://zifu-tech.com/app/webroot/userfiles/files/21211620031.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/74b7eef3e0ce247a1c8436e3888e4e52/45529585738.pdfIn PDF document text
    • https://fl-forever.com/upfiles/editor/files/tafenotalet.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/7423f3d8ffa3fc497ed0f7ef0effe4e7/zedudijesimig.pdfIn PDF document text
    • https://wildarium.com/ckfinder/userfiles/files/zojufawebatonir.pdfIn PDF document text
    • http://ck-tct.ru/userfiles/file/kewovuzexazexaxa.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6546700e39---fomesazep.pdfIn PDF document text
    • https://www.luthier-auxerre.fr/ckfinder/userfiles/files/rapep.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//36073747801.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/16080609c1ff90---roxitutozazozadam.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a519289a82a---35876673198.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/92127279536.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/203esps5r9u6g5n92mpt593lt6/kenadezalibupujuro.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/o129qcst2l0fl4oh4onvp1ea8n/19575250663.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/2519456219.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160aa302f8ed2e---xiduraxubivinatamemog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=how+can+i+recover+my+photos+after+factory+reset+android+without+computerPDF 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_off0000e370.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE370 17104 bytes
SHA-256: 4dfe0e351133310ba5b0b0a1a671877eb5cb604c65290ef0161dc5dd030e4047
font_01_sfnt_off0001102e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1102E 11196 bytes
SHA-256: 9452df9a591fa047f4278dc7e159994f41ad1e2c32384aed1de50739d060f3d6
font_02_sfnt_off00012a40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A40 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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