Malicious PDF — malware analysis report

Static analysis result for SHA-256 acee9c7f88e08c16…

MALICIOUS

PDF

81.3 KB Created: 2021-09-12 14:18:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 473d80c3c8f34bd3f5a7e9d64e66921e SHA-1: 54918efaeb40435759bd3b308eb5769d834aae45 SHA-256: acee9c7f88e08c16a6fbfbd6e25110ad4b93ebdf70483f69d353198d5d3aba80
256 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing and trojan delivery mechanism. Heuristics indicate the document attempts to trick users into executing commands via clipboard manipulation and provides instructions for password-protected archives, common tactics for bypassing security filters. The embedded URLs likely serve as download sources for secondary payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 9

  • 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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://ketchas.ru/uplcv?utm_term=bin+file+extractor+android PDF link annotation
    • http://medwin.kr/userData/board/file/48249313918.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/161358d316f0ab---zegizokejunevevur.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613a921d3185c---rilim.pdfIn PDF document text
    • https://autoteam.in/ckfinder/userfiles/files/37446340206.pdfIn PDF document text
    • http://zentrumok.com/userfile/files/kirupigovem.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613cab379d62a---37988493647.pdfIn PDF document text
    • http://baugeraeteverleih.de/benutzerdateien/34891067165.pdfIn PDF document text
    • https://landatur.com/files/galeria/files/zokiludenure.pdfIn PDF document text
    • http://bukhatirhomes.com/userfiles/file/pinogajalesufunibariti.pdfIn PDF document text
    • https://affordans.com/ckfinder/userfiles/files/gimimikez.pdfIn PDF document text
    • https://eltechma.com/zdjecia/fck/file/wasidumov.pdfIn PDF document text
    • http://cioccolatogallucci.it/userfiles/file/zepuxiwad.pdfIn PDF document text
    • http://sirmamedia.com/ckfinder/userfiles/files/kakopeliwalesigarateg.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/amvdurfham251kj10f66ar6s6p/xerikapamegi.pdfIn PDF document text
    • http://x-site.by/upload/editor/files/98964298308.pdfIn PDF document text
    • http://planao.com/ckfinder/userfiles/files/zuzenenilo.pdfIn PDF document text
    • https://uudanbury.life/files/file/dunajatu.pdfIn PDF document text
    • http://delfosventures.eu/userfiles/files/32791397871.pdfIn PDF document text
    • http://sellmysayarah.com/userfiles/files/lubunolegupovebalu.pdfIn PDF document text
    • http://mamolenasnc.it/userfiles/files/61053181523.pdfIn PDF document text
    • https://happycondo.leaddeehub.com/userfiles/files/defeguzegomezifun.pdfIn PDF document text
    • https://didacostruzioni.it/userfiles/file/39012551773.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_off0000d809.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD809 18384 bytes
SHA-256: b22cfd9fd242c3b264c467796a026372a2a3a04a72fd4673279a1778a13835a9
font_01_sfnt_off000107c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107C8 10456 bytes
SHA-256: cba3d4831bb50dad47ef1308df75e3ae43cdb9cc60b80183029b42b36b5c5729
font_02_sfnt_off00011fa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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