Malicious PDF — malware analysis report

Static analysis result for SHA-256 118a78cc2334103c…

MALICIOUS

PDF

84.9 KB Created: 2021-08-31 08:24:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b30610a4d5a5161bf361c7e6759925df SHA-1: 3d13f882895d6d38c9509c9e028d3728fd31cdfa SHA-256: 118a78cc2334103c5c92015d49ba96417f4a3cfd5659dd543b1283ea4a7d2d55
156 Risk Score

Malware Insights

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

The file is a PDF document detected as malicious by ClamAV and an ML classifier. It contains numerous external URIs, many of which point to compromised WordPress upload directories, indicating a link farm designed to redirect users. The presence of these links suggests an attempt to lure victims to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://pixomot.ru/uplcv?utm_term=warning+signs+of+dehydration PDF link annotation
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a58334e2ab5---69503598779.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/boxon.pdfIn PDF document text
    • https://firsatoyun.com/calisma2/files/uploads/55124482996.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a4e4bd4bff---39651578183.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/nuzunel.pdfIn PDF document text
    • https://ngusacdon.com/upload/files/temavudodasejivipipadex.pdfIn PDF document text
    • http://cybernet.asia/UserFiles/File/razevavex.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bd8af4c1228---50304570128.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/t7fim77frig3rhr67af599bmk2/35222331624.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/siavds6hui03cou19inlctaf7n/12229434561.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/8d865f983dd98eba9f6d2d1a7825fc88/13389092461.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/95p9a6pcvoe5r07l2a37u1urum/xiforowezik.pdfIn PDF document text
    • http://biosite.ru/images/news/file/18646801857.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/tj227qkn5rt6v36r51i5fsiqe6/laxuzajowamusajeruwi.pdfIn PDF document text
    • http://fhs76reunion.com/clients/0/00/009202203981f132fd14d012a57c0fe5/File/35002667977.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606d6a6c8aca3---mebumapovilabaleruwoxile.pdfIn PDF document text
    • http://jlsxjy.com/right/UploadFile/file///2021081823061873499.pdfIn PDF document text
    • http://xn----8sbfeahwarn6ac1adp3fb2p.xn--p1ai/userfiles/file/53916043886.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/59371568616.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/c42b7d8cb39734c4fb6f850cb5f9dc46/kesakevakojevezedawo.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160dafc605f48d---25190765038.pdfIn PDF document text
    • https://xetnghiemadndanang.com/upload/userfiles/files/jalovoziku.pdfIn PDF document text
    • http://rjbmachinery.com/d/files/woxadogewexuz.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_off0000e7a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A4 17992 bytes
SHA-256: df8971cd80949943532aa0b668cca61e178abb854bab224f17d975a880eae20d
font_01_sfnt_off000115e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012dfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DFC 10696 bytes
SHA-256: d0c45660127b840945d71f3a590c381dc2d8e7d6b83870ee56adfc4b4167944f

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