Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce75b51fb17813b2…

MALICIOUS

PDF

89.4 KB Created: 2021-07-30 07:58:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d878278bbf7eca246403622aa5139038 SHA-1: ec1b6d97deb81c8463d6b6410bbd10e5b7606065 SHA-256: ce75b51fb17813b22528ce24e4dc2fecf5f326d4c3e4c5a8054a356c4323d8b2
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL analysis point to a spearphishing attachment as the likely initial access vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/q2a617f2tsft29t1n2f21rsa2b/33615730730.pdf In PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/on5t6c5tqhc2hu426q4b79jsal/34764922946.pdfIn PDF document text
    • http://cablexconsulting.com/Upload/file/wunovirelako.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/16099255e905c9---94475816995.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609a87f390d42---32999640078.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/u4g3qspcn7dnbt5eo9p36kfer2/61934252790.pdfIn PDF document text
    • http://puppiesjust4u.com/clients/c/c8/c8a8d0e690f73854b1e7a5fbb9521f82/File/lobixagisefurarod.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b9b1a2a5398---93943901577.pdfIn PDF document text
    • https://conexkarvan.com/cache/fck_files/file/muzavuwup.pdfIn PDF document text
    • http://niestachow.pl/data/aktualnosci_imgs/file/61230171724.pdfIn PDF document text
    • http://boekenwinkelindex.nl/images/uploads/seruxalilazarepufikozogav.pdfIn PDF document text
    • http://interface-referencement.com/userfiles/file/wuvesozidi.pdfIn PDF document text
    • http://saluteebenesseresas.it/userfiles/files/dufazufew.pdfIn PDF document text
    • https://idd.no/ckfinder/userfiles/files/81941470759.pdfIn PDF document text
    • http://sistarelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/8446221326.pdfIn PDF document text
    • https://technische-dokumentation-hoffmann.com/upload/files/50038080579.pdfIn PDF document text
    • https://felicitareonline.ro/ckfinder/userfiles/files/jajimemijefalasumeko.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160cfb92f7b39c---76933441608.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/67dc41731cd551422317b8b7bf6279cb/xowukenofotukovutox.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202106160905139134.pdfIn PDF document text
    • http://duhochmis.com/files/uploaded/files/peperogoja.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/d9fc662f508d673a61ed7eb20174283b/74440187652.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/b197afe1a568bdcf701d3e9c79ca8f18/78535572629.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=sample+excuse+letter+for+being+absent+in+school+due+to+dysmenorrheaPDF 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_off0000f5cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5CC 11596 bytes
SHA-256: 8d0d1e198a30ab3b23466940c58942723c73db3f178fef70713ea658ba9c6548
font_01_sfnt_off000110b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110B5 17292 bytes
SHA-256: d1e709a2ef4a04eed88c48f31aef0111509c487d59f73b7e1ff51c37e603205e
font_02_sfnt_off00013e30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E30 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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