Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b8a7968a59c97d7…

MALICIOUS

PDF

113.4 KB Created: 2021-06-13 13:03:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 2f3c29f5f7622d02e588b43f89d14bd9 SHA-1: 987417c102991d93b98af8a0b1451681564bcaa1 SHA-256: 9b8a7968a59c97d779fccf89326e2d23021413e34afa228857493b045ac5cd9d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://crewmak.ru/uplcv?utm_term=among+us+signed+apk+2021 PDF link annotation
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9e150f681---43932567828.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb7dc346bf---davoxalamafuf.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/9c17298cb6a4fc0388fcc7cf541272d6/faburikidanazo.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a6b2965179---26812406254.pdfIn PDF document text
    • http://ballstonfamilymedicine.com/clients/861402/File/gapenerizakizemoxerawapo.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/e4a72a067e712905e6bbf943456237d3/mozemaka.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a22ec5a41ab---85045171155.pdfIn PDF document text
    • https://pjkconstruction.ca/images/file/jizedomedupazazididaxe.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/l5m59f10p6qmloei3npq14lg9k/73082555695.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abfa92b778d---vakika.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/hubdq446l8gfpsqhc7lbnsd840/balap.pdfIn PDF document text
    • http://dlt-nkp.com/fileupload//file/12782743330.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160809d669e152---sufot.pdfIn PDF document text
    • http://atdawnwelift.com/userfiles/file/11964239617.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/buzofazipefowokunonel.pdfIn PDF document text
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/c79575635d0e39e09367d35192763156/soxibetejof.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/32299630177.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E3 38704 bytes
SHA-256: 0240e33366743e2c3973ddda8e2878d63d10a2e26cdca0a4227dd5fa7e66d222
font_01_sfnt_off00016a73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A73 5532 bytes
SHA-256: 9256490919076c78f233096ab95dbc28e4a9b97a84c6f5de7e85e99b4ac08803
font_02_sfnt_off00017d47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17D47 11016 bytes
SHA-256: 33a4d708ea6524590a8e29652f3f1c402ca855757d5011f1df10e0e49449f56a
font_03_sfnt_off0001a275.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A275 16224 bytes
SHA-256: 74513f2e019fbe6fa0538f4f9d567ed310e0969f66e43a4d9e39f50aabc9b468

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