Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4739a9fc3232796…

MALICIOUS

PDF

103.2 KB Created: 2021-06-30 06:41:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 0ad630813fcd53cd74b8e431d7f0cf70 SHA-1: 05ed2bb316eb048ff84326e45d39ff88e942cf87 SHA-256: e4739a9fc3232796fc68b4f789b5aa518bdb4c2d4391a3e4e955e2e71a68e9eb
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS upload directories, suggesting it's used to host or redirect to malicious content. The document body was unreadable, but the presence of numerous external links and the 'link farm' heuristic strongly suggest a phishing or SEO manipulation attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9773

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.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/28a39bd2f4f1c9076a753f5d11f50914/60291682488.pdf In PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca1f322e77---40883911151.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/q5918k1k2r171g6vv0fmggbcsk/nisuzojeguzetewumeten.pdfIn PDF document text
    • http://turnwealthy.com/ckfinder/userfiles/files/50551089183.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609dd668ab180---6745526693.pdfIn PDF document text
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/9dccbc793c6d10e4880b4ad01c669630/20965514372.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160898c68e74ed---digotunekojevowovazutilu.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a648c94d06b---88748112706.pdfIn PDF document text
    • https://fertilizerproductionprocess.com/d/files/50115250230.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/zivuxadomir.pdfIn PDF document text
    • https://baxsporthorses.nl/userfiles/file/lumitunagugazadubasedezep.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/eddea0c2084f4f8e6505cb4d7213272a/58379498906.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-6-9/20210609231947440420.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/tirofarafagerulero.pdfIn PDF document text
    • http://dakhoanhanai.com/images/files/59388219087.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/6ea08964fbc79b1dec27055242f50e45/lizuzuwokumivaxoleze.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8522790fb---nabiba.pdfIn PDF document text
    • http://itssilvertime.com/clients/2/24/24efe347a73a8ce028152bf895bc11a7/File/54427952717.pdfIn PDF document text
    • https://nhahangbienhaitien.com/uploads/files/24453183278.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/16089a2acb782d---kivososav.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/40216d207f11840849b62a6e23b272e7/25175066085.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/0aba703cd552b0891377b7b1778085ba/xenijur.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/f18aea4787437cb6a16ad7a0297f79ae/95480418444.pdfIn PDF document text
    • http://banhangcongnghe.com/upload/FCK/file/60360893244.pdfIn PDF document text
    • http://garystrike.com/clients/3/30/301ae0ed988f9237e4cb8f8c41f6cb36/File/34442617734.pdfIn PDF document text
    • https://landbondcorten.com/attachment/file/3290d7b9c2a5e37e999e9fce48899ce8.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/7j74p792hdkq9mhbb8gku217p8/tujoralomipibiketewoz.pdfIn PDF document text
    • http://cupta.org/userfiles/files/20210628081357.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=patted+meaning+in+kannadaPDF 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_off00013a10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A10 10252 bytes
SHA-256: fb5a1fc6a17ef7ef0e765f12022d1a1ff28e175c0ceb8a07db4de12c48b43539
font_01_sfnt_off000150d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000168e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x168E8 15068 bytes
SHA-256: f341d5f288c7fb1122775bfc83a07303d17d2b316b3610b3344db1f4da27f4fd

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