Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2a9eda087212246…

MALICIOUS

PDF

82.3 KB Created: 2021-08-17 21:42:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 87bafcf5c43ca3cc386822f99d47248c SHA-1: a4878d35a4f8e2f2072858a27b20786d77c688cf SHA-256: e2a9eda0872122467a512adc3575c79eec2e395895c9820036ed14a371030acc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external URIs and link farm heuristics, indicating a primary purpose of redirecting users. The presence of ClamAV detection and ML classification as malicious, along with URLs pointing to compromised CMS uploads and disposable hosting, strongly suggests a phishing or SEO manipulation scheme. No scripts were extracted, but the document structure itself is indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://hbisan.com/userfiles/file/juninedazikuxipevebari.pdf In PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160744faee818b---31543228807.pdfIn PDF document text
    • http://qianxish.com/ckfind_image/files/27607055705.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/mokodofati.pdfIn PDF document text
    • http://batiment-tunisie.com/userfiles/file/zajegirupapuposakilawep.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609a308f718b6---746095447.pdfIn PDF document text
    • http://edgecs.net/documents/lirozenulatil.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/f9ecb8496cbb38a3694ef730a1eea7a6/rulabekefumarerisevuk.pdfIn PDF document text
    • http://urgentcarepb.net/userfiles/file/8903632622.pdfIn PDF document text
    • https://landbondcorten.com/attachment/file/95d497e5baecd5ce219c3f7202be6842.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609e1d24b3d04---95310967939.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160af42ac04a2a---bodejugiz.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/t88un3gqtqpgv10opvt9fhbv90/6050394511.pdfIn PDF document text
    • http://megat.pl/uploaded/fck_files/file/92702275788.pdfIn PDF document text
    • https://nanyangtextile.com/userfiles/file/fotadaferojejivajar.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d919b6b891---37826291550.pdfIn PDF document text
    • https://bursakaynak.com/userfiles/file/51106420790.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3e222b21b7---43409470763.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/27827f81635d1ed37764cd513bf15445/vefakelabiwogimoxazabav.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/xuwiwenafofiz.pdfIn PDF document text
    • https://an-professional.ru/img/files/file/ziwirebefip.pdfIn PDF document text
    • http://hasyo.net/files/file/pirozaroxawavezutel.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/pamebudutajoxokewaxaluvap.pdfIn PDF document text
    • https://www.djluk.co.uk/wp-content/plugins/super-forms/uploads/php/files/sdhe2p4nb8vi66pjkv41oogith/lijozumamivaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=cheesecake+factory+menu+with+prices+2020PDF 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_off0000dcbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCBF 11364 bytes
SHA-256: 14f83866df3f82fa06551982d08cb3d778f8df56cf719a1b7e49b183123f0440
font_01_sfnt_off0000f784.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF784 17012 bytes
SHA-256: 413090dd79bb3c5e34a8b3b8abe3c280438cbf8beafab6cf47f48a56d13fe965
font_02_sfnt_off00012383.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12383 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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