Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7894218e5110a05…

MALICIOUS

PDF

88.0 KB Created: 2021-09-05 23:44:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9ccb2a49191547c6d8da457f4574b801 SHA-1: 6a939b7556f5a3b9bfbb50cece1a99f8463f5774 SHA-256: a7894218e5110a0511f4e67f1c5840f59f26cfd4b01ba7430ef2ffa1b14060a6
236 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains heuristics indicating it's a link farm pointing to compromised CMS uploads and a lure for clipboard command execution, often used to bypass security filters. The document's purpose appears to be a phishing attempt, likely disguised as a document requiring a password to open an archive, thereby hiding the malicious payload from initial scans.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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
  • 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
  • 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://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/lcc4uq400r7m10mkj2k4ol9pkg/51885897143.pdf In PDF document text
    • https://mimpishiodua.com/contents//files/19008700221.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/55522462455.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/16076dd871072f---29255505964.pdfIn PDF document text
    • https://aulacvn.com/upload/fck/file/54845084750.pdfIn PDF document text
    • https://relans-nn.ru/images/docs/file/42546200964.pdfIn PDF document text
    • https://wendi101.com/userfiles/file/56811353741.pdfIn PDF document text
    • https://used-machinetools.ro/app/webroot/files/userfiles/files/43990115087.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/d98b45abd20462cb86b0abc9420a7bd9/dasamomegozovuzepimizov.pdfIn PDF document text
    • http://dungculamdep.com/fckeditor_userfiles/file/lujeronomivigo.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160be17a6cf173---12528049225.pdfIn PDF document text
    • http://otohyundaidanang.com/uploads/image/files/jadagebomejexepafoj.pdfIn PDF document text
    • http://php-lounge.de/userfiles/file/fevavixadujulozekunugapis.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/gebaxemakevoravisafon.pdfIn PDF document text
    • http://rubivina.com/Images_upload/files/72544512973.pdfIn PDF document text
    • http://piotrkowska77.pl/zdjeciafile/20973238259.pdfIn PDF document text
    • http://www.klimavill.com/data/editorfile/zububivu.pdfIn PDF document text
    • https://ppuhperspektywa.pl/files/edytor/file/kinizozuxexigezixuvejaf.pdfIn PDF document text
    • http://chizclean.ru/files/fck/file/44227459265.pdfIn PDF document text
    • https://themalc.org/files/file/76009047624.pdfIn PDF document text
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/2f33abbaf51af74effa155ec24d43c75/51444150364.pdfIn PDF document text
    • http://inspirationforexcellence.com/clients/66491/File/72282478175.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/cenc6j5bod59r8tdgnifq0ef82/64896772115.pdfIn PDF document text
    • https://hansenlight.com/UploadFile/files/67400113769.pdfIn PDF document text
    • http://komputerzagrosze.pl/userfiles/file/71867916358.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=free+software+to+unlock+password+protected+pdf+filesPDF 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_off0000f3d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D6 17224 bytes
SHA-256: 5e03af9d0f24f24327183954f6de1fcac9be8d1744ffbba3dceeff4aed056d3f
font_01_sfnt_off00012089.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12089 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000138a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138A0 10868 bytes
SHA-256: 780bef99204892f8af85559c87f30ee8e4d0f53f36e4b84567e8b4d73adf3374

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