Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c3cb4883f6d943e…

MALICIOUS

PDF

137.7 KB Created: 2021-08-07 12:48:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b02f7b50c1b2b80c2cfadc65c6894550 SHA-1: 93df011f6edec8f0c8fe4d78ab3ccf06f654eb3f SHA-256: 9c3cb4883f6d943e1cc9c32f9ae14761d6a5f285002e14d8c4659a66d29ab6e5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous embedded URLs pointing to compromised CMS uploads and disposable hosting domains, suggesting an intent to lure users to malicious sites. The presence of multiple distinct hosts and UTM parameters further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

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 http://poltinik.ru/userfiles/file/givisutazaxifilewuxok.pdf In PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/dc1e6b4f473ddcc2b6231e4bb6651916/13937806775.pdfIn PDF document text
    • https://windsbs.biz/files/file/xuwogalobaz.pdfIn PDF document text
    • http://dxqzx.com/ckfinder/userfiles/files/20210715_235925.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bf1aa4bc12---68682141556.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9d356d784d---wagavati.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdb21f3658d---luwotajonatepazisuvatil.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/80657860143.pdfIn PDF document text
    • http://alexhoffordphotography.com/temp/files/file/fudanepepe.pdfIn PDF document text
    • http://studioboscono.it/userfiles/files/3421889886.pdfIn PDF document text
    • http://fujiya-la.com/uploads/files/38484854704.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/c1e70cb5633f044e2ce8b65603a60509/90858730588.pdfIn PDF document text
    • http://canhtoanland.com/upload/files/37421162291.pdfIn PDF document text
    • https://pmsp-me.com/userfiles/files/tazubedini.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d09b09bb540---rukibex.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608643944e65a---moxegexedag.pdfIn PDF document text
    • http://ty-universe.com/image/files/20210623_211331.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160b291e79fec4---65165769228.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cbf29a514c---difaju.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf9ff0ba1c2---71885147312.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609eeae550454---wonavo.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/87630918161.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/53a23181313b1b8e406ae0f1fdf42c2b/sozadigezeli.pdfIn PDF document text
    • http://csc0731.com/userfiles/file/20210723100457_5jcnxr.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=ejercicios+resueltos+lexema+y+morfema+1+esoPDF 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_off0001b2ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B2ED 10872 bytes
SHA-256: f11954b33e943a66de8c684015711d797fcee5cd361a616466ef8f475693ee46
font_01_sfnt_off0001cc26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CC26 19560 bytes
SHA-256: 64778837dfb3f0c3e58e497329fdcc63aa0852c87b23990ccb7299fb29478656
font_02_sfnt_off0001fdca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FDCA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1