Malicious PDF — malware analysis report

Static analysis result for SHA-256 393fe3d93f81ff88…

MALICIOUS

PDF

86.6 KB Created: 2021-07-06 00:53:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: faef0e5e9f0db301825c9cba596d12c4 SHA-1: 3a676afb19b387aecda3e84444b0f3874964d6b9 SHA-256: 393fe3d93f81ff88ef5be839ffca44dbe69c8643539a58213fb305d1b93f9676
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external URIs, many of which point to compromised WordPress sites acting as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The embedded JavaScript and link farm structure suggest an attempt to redirect users to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://chcial.ru/uplcv?utm_term=candy+crush+saga+mod+apk+unlimited+moves
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/a78308c11ef5f871ee1d33c4e0cf8166/supono.pdf
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/16077bd71ab0ed---vanovenifejebigaf.pdf
    • http://matchedtubes.de/userfiles/file/pulekide.pdf
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160c114fa03e84---34842618828.pdf
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/xilinazub.pdf
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/feb05998b0fcaab74ac2d71f8a4d6c42/sokadesug.pdf
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073c7eb6b269---wawevuzalunuzutexure.pdf
    • http://rebizplus.com/userfiles/file/zopogobajuxefofenadumu.pdf
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607b111da81b1---vekikikesidosonamogibafa.pdf
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc425231cc---86874333880.pdf
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b1de497dca8---76457196210.pdf
    • http://ctyrkolky-gamax.cz/data/dokumenty/jegeki.pdf
    • http://brmc.jp/user_data/userfiles/files/rimowa.pdf
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b9b9ece29e7---73589835812.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/67gncltqfraogc4junki9dqmv4/jeveta.pdf
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/hmbm4mv00vhv62ves60g0edht1/tasematex.pdf
    • http://jatyn.cn/upfiles/202105/file/1621542673.pdf
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/ba0b1d0ecfe06f67475f6ff8fe50131c/kotilowasobozogogupijigub.pdf
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9815c6efa6---53964160589.pdf
    • http://mp-journal.com/media/file/ratimopetopijububuxa.pdf
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095b4c4d90a7---6269057659.pdf
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/m2aqlf5dt8viovuh4rhugov3u7/51050746642.pdf
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/f5419ad1205f8b384e1d7b75ee5584d7/mekojiwuwesata.pdf
    • https://metnar.pl/web/uploads/files/taliliz.pdf
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/5a6fd5a8135b4112cebc9a77e51c1947/xesilojuxemofak.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee3f.bin
696f2c57f131edd9dba3e71d081524bfeeb0c766477c119a69c7795900d17f22		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE3F 16952 bytes
font_01_sfnt_off00011a69.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A69 16792 bytes
font_02_sfnt_off00013280.bin
e2f59ccabb705d2a875b6f687ce6570af83bc75afd71af6a8263e6c8d6fd489e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13280 11364 bytes

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