Malicious PDF — malware analysis report

Static analysis result for SHA-256 66ca7c234ea36608…

MALICIOUS

PDF

73.2 KB Created: 2021-09-17 03:04:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 54c852687377970d1e49d85378db10ca SHA-1: 41f5184e3acf71ce1c51a3a50658c6ee470233c9 SHA-256: 66ca7c234ea36608a0a4fcabc95d1b8c88c879875cf48adf463d06799a5d0693
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier, indicating malicious intent. It contains numerous links to external websites, many hosted on compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://infrive.ru/uplcv?utm_term=clash+of+clans+online+hile PDF link annotation
    • http://volkshilfe-ktn.at/images/content/files/bidigewuru.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613319b1dbac0---gopobutisakidesisomividu.pdfIn PDF document text
    • https://icnj.net/ckeditor/ckfinder/userfiles/files/dudubalekigirej.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613976c0d8dfc---mosawetikovexisupelipi.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132a11950040---zevumegijusal.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/d0df3fa4a80da57b2dfc5034fbe66eb9/ruvazitajoninurakubaxiba.pdfIn PDF document text
    • http://planao.com/ckfinder/userfiles/files/59544720925.pdfIn PDF document text
    • http://nedvizhimost-v-sharm-el-sheikhe.ru/uploads/files/bijuva.pdfIn PDF document text
    • http://konberdbio.com/upload/files/nipikifomopitevadexuvilo.pdfIn PDF document text
    • https://ausztriasi.spawellness.hu/upload/hirlevel/files/doparokadegapetixosuxuziz.pdfIn PDF document text
    • https://rentcar888.com/uploads/files/202109071335049700.pdfIn PDF document text
    • http://canadianrockies.info/files/file/42833600181.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/d96o420iuu7jd702djmln2ioq6/pefagerowoj.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134aee816b18---zolowerejekumajazu.pdfIn PDF document text
    • http://ketoanaca.com/uploads/image/files/zuburadi.pdfIn PDF document text
    • https://www.padanguparduotuve.lt/ckfinder/userfiles/files/93554360441.pdfIn PDF document text
    • http://showpalmedical.com/userfiles/65927021160.pdfIn PDF document text
    • https://vienhung.com/webroot/img/files/34694827281.pdfIn PDF document text
    • http://ruihuitax.com/files/file/fisumirowinodomujuvowolo.pdfIn PDF document text
    • https://melz-feu.ru/upload/15203475620.pdfIn PDF document text
    • http://local-minicab.com/survey/userfiles/files/pomenugufidipibaja.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16143c29fe5eb0---4797347450.pdfIn PDF document text
    • https://bywuf.org/upload/editor/files/fepofipineziwezexatope.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613dc00515836---32915888304.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_off0000bb89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB89 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d3a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3A0 10264 bytes
SHA-256: 93b6735bb3d8a93aea5f2d4102c311ee8db8cd97708a304d67d8e350601e6c1b
font_02_sfnt_off0000eaa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA1 17176 bytes
SHA-256: fe16cdfe6e58e6b21cb33ff2aabd7489794fac13c0567518615bd18516dce440

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