Malicious PDF — malware analysis report

Static analysis result for SHA-256 66e3d572561592f5…

MALICIOUS

PDF

70.9 KB Created: 2021-09-14 08:28:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: dcf2a9a0eed01974da9dedcf06db3f74 SHA-1: 61fb2e587294fc5814ae0f68162c9e4930780f7f SHA-256: 66e3d572561592f5100d021a3351c21e0b91b2774912a69b88aa0aa49bcb9ae9
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs that point to various domains, many of which appear to be part of a link farm hosted on compromised WordPress sites or disposable domains. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and URL distribution strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://laborke.ru/uplcv?utm_term=dragon+ball+z+episode+129 PDF link annotation
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/16133f7ae19bc3---8401692530.pdfIn PDF document text
    • http://learningkey.org/userfiles/72130266742.pdfIn PDF document text
    • https://epgeptech.hu/ckfinder/userfiles/files/busufilowusij.pdfIn PDF document text
    • https://safewatersolutions.in/ckfinder/userfiles/files/22049736703.pdfIn PDF document text
    • https://bitree.com/ckfinder/userfiles/files/padutiwalolozatavarokaf.pdfIn PDF document text
    • http://tieulongcopro.com/luutru/files/46396343825.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/ulgas29qgli6i0dnavl86s5tbk/83718454605.pdfIn PDF document text
    • http://gaineyranchaz.com/userimages/86733658440.pdfIn PDF document text
    • http://badgerhillfarm.uk/gojotaxomabakatoduniw.pdfIn PDF document text
    • https://villadelauca.com/userfiles/file/47776472600.pdfIn PDF document text
    • http://www.oomedia.com.tw/ckfinder/userfiles/files/xuresikapajorulorituvuk.pdfIn PDF document text
    • https://dermatologie-chamonix.com/userfiles/file/60571467817.pdfIn PDF document text
    • https://heritran.vn/uploads/news_file/munivo.pdfIn PDF document text
    • http://insightonafrica.in/userfiles/file/fipevitemexibisuketotuneb.pdfIn PDF document text
    • https://baoyi-chuck.com/ckfinder/userfiles/files/wefadibajabixevixujomobu.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/07ee7353d5b49e8d9730aaeeda7d8c0b/faburew.pdfIn PDF document text
    • http://stellarp.com/userfiles/file/28065402803.pdfIn PDF document text
    • http://ohmamakitchen.com/uploads/files/padukipukotuwonisukipu.pdfIn PDF document text
    • http://spodne-pradlo-2bpoint.sk/UserFiles/File/josefakumumawureropemexig.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/161302d4adabfe---topowiluzupozokekene.pdfIn PDF document text
    • http://silverspringabw.com/uploads/files/rizefabazupifun.pdfIn PDF document text
    • http://semihkerpiccilervesupersound.com/upload/file/wanugimugu.pdfIn PDF document text
    • http://anquocrealty.com/uploads/image/files/26897265603.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_off0000b08f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB08F 16568 bytes
SHA-256: 0a66a86665b3d457bb77f0c2ce83ec734884f15826deb5c1576f8f0b76a9e55e
font_01_sfnt_off0000dae5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f2fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2FC 11008 bytes
SHA-256: 79cc1578727dff031ab25acc4791cfecf81da7c6244f9031360b7d8c9241a20d

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