Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb757d790db86c7c…

MALICIOUS

PDF

156.7 KB Created: 2021-07-01 21:50:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 31d75dc6838370b3771ef362d35fa2cb SHA-1: ff8798431e92619cc974b578b8e483fdb14cf3ef SHA-256: bb757d790db86c7c6f6bc83702c81a52138d3f5ec8cace9ac11b66ab7a6dca0d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and links to potentially compromised websites, suggesting it functions as a link farm for phishing or malware distribution. The presence of embedded URLs and the overall structure point towards an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://inwebjor.ru/uplcv?utm_term=exam+essentials+test+1+reading+answers PDF link annotation
    • http://woori-tour.kr/FileData/ckfinder/files/20210615_ACE189E12F40B124.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/18316899078.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/vozifatasun.pdfIn PDF document text
    • http://kubablimel.pl/Image/files/15024437676.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/gq0ornspgbvkvdjb5lvrbb4r7c/fenejufugitigurufu.pdfIn PDF document text
    • http://china-hold.com/UploadFile/file/20210618205623341.pdfIn PDF document text
    • http://sieuthibongda.net/ckfinder/userfiles/files/tusutagonoribugogowa.pdfIn PDF document text
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160759cecaafc2---wuxat.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/ut8h7ep64f5r0a0fj7ulim0meu/58598658591.pdfIn PDF document text
    • http://madonnina.info/userfiles/files/penamuwigiretovana.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/rgrngru19dj3m0bvjfj57f2app/94987231638.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/9d80a4a292601e7cea8467410ee774d2/tukejaxo.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/74407590897.pdfIn PDF document text
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/d659a3c349c72c2225cef36f33c7cb4c/30122245867.pdfIn PDF document text
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/b3a01bf08fb666d50bc5c57cf67ff1fb/49312785960.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/af3ac23e76b6bc3a0c6b860fb7f4e9cd/noxujiv.pdfIn PDF document text
    • http://fandimnarodaku.cz/upload/file/88895697773.pdfIn PDF document text
    • http://alexanderkanevskyartistbiography.com/clientMedia/file/59452549781.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078ccd15d94a---setokolipovu.pdfIn PDF document text
    • https://bestcoloringpages.com/userfiles/file/lipebabotaretiretipowob.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160703a090646e---dekodomimamubimuno.pdfIn PDF document text
    • https://bomberosdenavarra.com/userfiles_nexo/files/87796302491.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00020351.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20351 18488 bytes
SHA-256: db392408c86fba36ad8cc96021e05c3f9c99d9f5dd5c7f3eb8560c182de92c86
font_01_sfnt_off0002349c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2349C 10692 bytes
SHA-256: 7f7d8e2e06140d5bdce93e8df51c6c062f37ff027740499c1fb97e1e1172009b
font_02_sfnt_off00024cfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24CFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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