Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef15839553626d6a…

MALICIOUS

PDF

69.6 KB Created: 2021-06-08 12:24:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 442a377502eae03dd592ba507e4f54d6 SHA-1: abca9fa5ee386529101daeffe7b63405ed588279 SHA-256: ef15839553626d6a355ed8e771639ea1ecd0201eeb707c1893a46273deb93f54
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document is classified as malicious due to its structure as a link farm pointing to various compromised websites, likely intended to host malicious payloads. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a tactic of using disposable hosting for these links. The presence of embedded URLs and the 'SE_DOWNLOAD_BUTTON' heuristic suggest a social engineering attempt to trick users into downloading further malicious content, possibly disguised as a comic strip template.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://archism.ru/uplcv?utm_term=comic+strip+template+printable PDF link annotation
    • http://sklepjola.pl/userfiles/file/47825475661.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aec98c2f547---21911397176.pdfIn PDF document text
    • http://ippon.lv/uploads/File/mifupe.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/3b1a491e173452b90dad963ba1a0b0f2/jowajatozipidan.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/3bf5c662a033750bec7596aa838999ed/guzuterubaxek.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/a6913cd39dbee69fe3325adfbcf1673b/30481725425.pdfIn PDF document text
    • https://aspirans.com/files/file/deximo.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/j0atg2ukknp13i1ktph15f7825/82710206522.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/5b15d726c6d3302329b930230de58a52/zoxox.pdfIn PDF document text
    • http://backkwang.com/userData/board/file/madonovajabivides.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/92176135684.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a220cede24a---22497835723.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097a5f40f486---bilexenokumadagilanutag.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16080db9c56caf---26165190026.pdfIn PDF document text
    • http://trendymamy.pl/userfiles/file/parixa.pdfIn PDF document text
    • http://megat.pl/uploaded/fck_files/file/masifazadog.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB2B 5124 bytes
SHA-256: adf2071b20a59008a811e4c2c1e2932cffc3b2df1b8c56c2ae26dd5a652dd296
font_01_sfnt_off0000ec77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC77 10720 bytes
SHA-256: 6d33d6c452da40b835d81faebd5638fcca13a8938de7e88f02a4fbcf021b92da

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