Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f0cfa165da83a50…

MALICIOUS

PDF

81.3 KB Created: 2021-09-13 07:51:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: 55846b4def673885041ba2685c9f9df9 SHA-1: c4a641507614edee132bb6015252c5591d2f1dd4 SHA-256: 1f0cfa165da83a5036da573cc316bed9c12095f6ce116cf367ec1bc4f6d57a8d
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to compromised WordPress sites, likely intended to trick users into downloading a password-protected archive. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' strongly suggests this tactic. While no scripts were directly extracted, the presence of embedded URLs and the nature of the link farm indicate a phishing or social engineering attempt to deliver a malicious payload, potentially via a password-protected file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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://philabc.ru/uplcv?utm_term=how+to+transfer+data+from+android+to+iphone+se+2020 PDF link annotation
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1612f61df00bbf---suwamurer.pdfIn PDF document text
    • http://juditphotography.com/picture/userfiles/file/72961591980.pdfIn PDF document text
    • http://bloodfaces.de/attachment/file/50786295595.pdfIn PDF document text
    • http://baobianhkhang.com/upload/files/rotowemosorobimed.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613658b26b50b---53896091083.pdfIn PDF document text
    • https://profipreklady.cz/www/ckfinder/userfiles/files/xufomajat.pdfIn PDF document text
    • http://smart.sut.ac.th/tsme/src/lib/ckfinder/userfiles/files/bafam.pdfIn PDF document text
    • http://breakevenpoint.pl/uploads/editor/file/jedusaxawebugovuxepejiz.pdfIn PDF document text
    • https://nikoljski.com/ckfinder/userfiles/files/92611717263.pdfIn PDF document text
    • http://www.parinet.fi/tiedostot/files/mupesolonofowiximab.pdfIn PDF document text
    • https://aiwcecckolkata.org/FCKeditor/file/letonira.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ecd44d47d4---55095006457.pdfIn PDF document text
    • http://mbfeed.vn/upload/files/wibapizimu.pdfIn PDF document text
    • http://caminodesantiagoenmoto.com/assets/ckfinder/core/connector/php/uploads/files/60896073255.pdfIn PDF document text
    • https://webmakler.org/userfiles/file/sorurixumimoweriwi.pdfIn PDF document text
    • http://msdoubrava.cz/foto/images/file/kaxetuled.pdfIn PDF document text
    • http://ersenergy.com/UserFiles/file/vukukapexoko.pdfIn PDF document text
    • https://www.fangjin.org/ckfinder/userfiles/files/laluwetajuruzalu.pdfIn PDF document text
    • http://sbriz.ru/userfiles/file/nasararaxenupa.pdfIn PDF document text
    • http://poltinka.ru/userfiles/file/jasobejoz.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/62b2e4e426f4f16791dbd23c230841fb/16590017615.pdfIn PDF document text
    • http://codienlanhtrangia.com/Images_upload/files/domunidipexuxenovakumuxi.pdfIn PDF document text
    • https://vanvoorst.info/uploaded/file/40978430320.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_off0000d883.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD883 17524 bytes
SHA-256: 3778f9c0e9ca78a9ee61f557506c07edb6f398e17c53a0caedacac75d4b5bf6d
font_01_sfnt_off00010542.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10542 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D59 11036 bytes
SHA-256: 531771d06fa1bbf4091c94216fc0cdebdc8e0a7b280bf67b14d138fcfa2b2110

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