Malicious PDF — malware analysis report

Static analysis result for SHA-256 d066db35cec5afda…

MALICIOUS

PDF

104.2 KB Created: 2021-06-26 11:44:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 5d4a535399d9073a6436c72edd589fa2 SHA-1: 361827cfee755d0b878b45c3b4b9dc1a94db77b4 SHA-256: d066db35cec5afdae865c23bd12abcf6fd673754aaa9711caaff448dd9884d29
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a ClamAV detection and an ML classifier. It contains a link farm with numerous URLs pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to lure users to malicious content. No scripts were extracted, and the document body was unreadable, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9747

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://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/781139f4ac6cd55794aca896cb571838/genezoginapamedogiw.pdf In PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/65f4e7bfecdb3b205466ded8c10506d9/80289741691.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607000170ab1b---95872355074.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/0196eec836e4c409ff9b92a23a757336/latiduvafisekiposimada.pdfIn PDF document text
    • http://ciaooo.ru/uploades/userfiles/file/35747599624.pdfIn PDF document text
    • http://anandtouristcorporation.com/uploads/rijolo.pdfIn PDF document text
    • https://aduanaldelvalle.mx/userfiles/file/90899812302.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dfadcc4062---72712142471.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/8722d1ba8eb1b93e91c395f85a6c0d94/17714208894.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608a2c6fcfa01---wezetawu.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8e241dc1a---80790946695.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16078c39e7e39d---43305469915.pdfIn PDF document text
    • https://zweefvlieg.net/userfiles/file/dujiduwavejidaxiduruja.pdfIn PDF document text
    • https://ready4use.ru/uploads/files/41742981632.pdfIn PDF document text
    • http://whs1963.com/clients/7/75/758a827d59fb1c2827eec60421ffdc22/File/xukivifawibolit.pdfIn PDF document text
    • https://hijaulumut.com/contents//files/17768799687.pdfIn PDF document text
    • https://afra24.com/basefile/afra24/files/vawegokegujesidaxopanewal.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607681d004ee3---foxibepamuzuw.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/dbd3962a9f18b1b3ca4ea23dafbdb3b1/23119275337.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a5cc8d9e508---91737193973.pdfIn PDF document text
    • http://hzbmsj.net/images/upload/File/ziwatibiwinozere.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c947f5ca9af---mageg.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160984f53c1139---pewidelemisikinupum.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160896add6da2b---34787269559.pdfIn PDF document text
    • http://cuacuongiare.vn/upload/files/46819708652.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=every+pokemon+gym+leaderPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E8 24504 bytes
SHA-256: 8fabeb4b49ea9c2f6dbdb1b3e5eb211f27d39d2dcf877962597f7e5a2a5b2bac
font_01_sfnt_off000130bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130BD 10632 bytes
SHA-256: 1fdb22e4b3f5cc8b18d340d94e4f0949566abe393499dedd2f41afa5d96500ff
font_02_sfnt_off000148d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000160e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x160E2 16852 bytes
SHA-256: 1a051cefaae6a6d953b18deb457109988c4dda8d3a3a42e8df0102b80e464174
font_04_sfnt_off0001791d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1791D 7336 bytes
SHA-256: 671b35187d5146e45067decee7ef023e403889e67252b9f4fd997cee29013352

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