Malicious PDF — malware analysis report

Static analysis result for SHA-256 5679066be346c1d0…

MALICIOUS

PDF

66.6 KB Created: 2021-06-19 08:47:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 3869fe33c4e9702aadb80c5b3e8fe49b SHA-1: be031547135c55055aac8b0f2448715eaf46f961 SHA-256: 5679066be346c1d08288c08abe2165be1f5a0ddcd003b71a62d1e9b7b938156b
96 Risk Score

Malware Insights

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

This PDF document is designed as a link farm, directing users to multiple compromised WordPress sites and other domains. The document body, though heavily obfuscated, contains text suggesting it is a lure related to 'seventh day adventist sabbath school lesson pdf', likely to trick users into clicking malicious links. The ML classifier strongly indicates malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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=seventh+day+adventist+sabbath+school+lesson+pdf PDF link annotation
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16083299dd9985---foteluzevetix.pdfIn PDF document text
    • http://simonide.org/userfiles/file/senotubedezuzigiv.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a2989cb5180---kilaxanobifizagiwoni.pdfIn PDF document text
    • http://muzycznescyzoryki.pl/userfiles/file/jidibufif.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/f77d013f264981e7df8bc1bfc87a2863/pobub.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160badf271fbd4---fenixobalukiroxoguzajuf.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e9a2f162c2---41193463417.pdfIn PDF document text
    • http://score1forspencer.com/clients/4/45/4587145e2679cb7673d0e21b436e5c25/File/sejaxakisusuziwer.pdfIn PDF document text
    • http://illinoislivestock.org/userfiles/file/54132912458.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160721c635352e---83849930455.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/xuwapizipeweburosebufuker.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/83fca632d534cdee496d1c05e089ea39/7843318874.pdfIn PDF document text
    • http://steps4cancer.org/clients/a/a7/a78c374070a178914b502abaf3db82b8/File/gubexerowiwebagolopo.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/53387f583b47c258a39c6d274c8c0f65/masovadolutozi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b752.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB752 5340 bytes
SHA-256: c8d682888e30d96f85103dab470a13a9fac18d5a27989a315973ed41c0b6f6fa
font_01_sfnt_off0000c979.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC979 10604 bytes
SHA-256: 6585e4f68bd00cc88e677fca7ceadacb20a82dcc751e9cb1fee35140d035b198
font_02_sfnt_off0000ed77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED77 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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