Malicious PDF — malware analysis report

Static analysis result for SHA-256 85ae8737b49ec9be…

MALICIOUS

PDF

88.0 KB Created: 2021-07-18 06:02:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: bd34ce1039391ddd3d162d8a610454bf SHA-1: b0d570d7dccf9b07b535c0aa1dc75f9297e0ed96 SHA-256: 85ae8737b49ec9be5ec75728e14e9e91c8c641f9cf82d0238c4d38fd5fda06a7
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as 'Pdf.Phishing.Trojan' and a machine learning classifier indicated a high probability of maliciousness. Multiple heuristics indicate the PDF acts as a link farm, directing users to compromised WordPress uploads and other disposable hosting sites, suggesting a phishing or malware distribution scheme. The embedded URLs and the nature of the heuristics strongly suggest an attempt to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://aucordechasse.fr/vosImages/movixatowefemibelexule.pdf In PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/doa3v3koga1fs3hpli5u06bms1/xaliwiritexisoromitepenot.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/keruxisemonuz.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5469452c74---xovarivof.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/hr8b58ccnsmej5ohhisdvbneq3/defojowubibiremalojew.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/83325790327.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a35b89809f2---4746639193.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079396235d25---51962605835.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1e2983b76f---fagogipuluxapezikutig.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160afa2e450857---jonuw.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160701d298e0f4---65020485372.pdfIn PDF document text
    • http://alexhofford.com/temp/files/file/ribatipi.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160abf7e2ec013---32023520385.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/b5993fdfa15c894d1993619db794fc2e/nipozemoxabivuvu.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1609037d478339---woxotafopoju.pdfIn PDF document text
    • http://amblesidewindermere.ca/fckuploads/images/file/fatigefo.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/v97ev43ln030pl23h86qfeai32/94941084825.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0db8dac40b---10220048410.pdfIn PDF document text
    • http://occahomesearch.com/userfiles/files/58946467423.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/marajiziv.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609237e0b3b08---rodadoziwolonoxakufiluk.pdfIn PDF document text
    • https://infiniteprospects.com/FCKeditor/file/35461506130.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4a67b7a304---lubuluje.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/zukojeluzidegepa.pdfIn PDF document text
    • https://ivanda-commerce.hr/userfiles/file/pabikuz.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160abd7a7afa02---43093703179.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=ncert+chemistry+class+11+part+1+pdf+free+downloadPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab7356ca764---fejukakokozol.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_off0000f317.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF317 11112 bytes
SHA-256: bef8f8b2fc002e1e3631985799b576c974a5843fdbf9221e7af3f13d6be41f2a
font_01_sfnt_off00010d00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D00 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012512.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12512 17384 bytes
SHA-256: 406bfb29a9fcd30b65b17c6acf78bf280d02239e4c5b1babfda9648e7f4f3736

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