Malicious PDF — malware analysis report

Static analysis result for SHA-256 76ecf71ed74c7b72…

MALICIOUS

PDF

80.6 KB Created: 2021-09-16 02:07:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3c886ad1ef5eaa397389444536e95cd8 SHA-1: 6a9757afe5c4025cdfcd2c0c29fbfd4d6a63ed39 SHA-256: 76ecf71ed74c7b720dad1183218e53aabcbed0132316f779ec203f6ce2d6e8b4
236 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and exhibits characteristics of a ClickFix social engineering attack, instructing users to execute commands. The document body is heavily obfuscated, but the heuristics indicate a lure to execute commands via the clipboard, likely to download and run a second-stage payload. Several URLs were extracted, some pointing to compromised WordPress uploads and disposable hosting, suggesting a distribution network for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://magooferta.pl/uploads/fck/file/rofolasukanon.pdf In PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb772ab7e3---woziwule.pdfIn PDF document text
    • https://doctornhospital.com/banglanews24/editorsfiles/files/87946151396.pdfIn PDF document text
    • https://wheelmartthailand.com/image/upload/File/xitidovujaxitipal.pdfIn PDF document text
    • http://golfvillageonline.com/userfiles/file/65175653282.pdfIn PDF document text
    • http://pivotal-technologies.com/userfiles/file/bufujetibevut.pdfIn PDF document text
    • http://ecohouse-lab.de/userfiles/file/guvun.pdfIn PDF document text
    • https://ccaquebec.com/userupload/files/65338418716.pdfIn PDF document text
    • http://anthonyjcincottalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bemevareri.pdfIn PDF document text
    • http://qbcar.ru/ckfinder/userfiles/files/sukivavujokugosuko.pdfIn PDF document text
    • http://extrastyle.ee/ckfinder/userfiles/files/38928569862.pdfIn PDF document text
    • http://rzn-house.ru/upload/file/gexeb.pdfIn PDF document text
    • http://tecs4.com/intranet/ckfinder/userfiles/files/6179328949.pdfIn PDF document text
    • https://phukienbep.net/media/files/benevokuxuvigujetaf.pdfIn PDF document text
    • https://cfbadalona.net/ckdata/files/31675382818.pdfIn PDF document text
    • http://iwilldoit.ru/uploads/files/files/98841148609.pdfIn PDF document text
    • https://gamepinleri.com/calisma2/files/uploads/sabafoxisuxexapa.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/ofvvmu69d0gbj8pu9fhqd46rv4/numozal.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/161405e71de61b---66941638542.pdfIn PDF document text
    • http://rockbond-aac.com/id-admin/fckImages/file/zevemigifuguwagixajota.pdfIn PDF document text
    • https://sanmuabancongty.vn/images/content/files/denifibosotubude.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/72964599080.pdfIn PDF document text
    • http://leprofit.ee/cmsfile/contentfiles/zorubalodabida.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613a4c0237e78---52671715502.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=browser+tanpa+blokir+internet+positif+di+pcPDF 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_off0000d794.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD794 10984 bytes
SHA-256: 8cf4c946aa730ecbe0be929f8d941f02667f863607c8a4cb245bd8a9cced1a08
font_01_sfnt_off0000f110.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF110 16472 bytes
SHA-256: 82bfd03c3a1f89f6a4e90100bdb60b3f3918c9ff2e2672f1dbcf3caf6c3f8ff2
font_02_sfnt_off00011c26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C26 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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