Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b78ccf2ca74405f…

MALICIOUS

PDF

103.0 KB Created: 2021-07-30 21:49:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 205bd48f9aecdd1719fa8b9259575ad4 SHA-1: 2e4fdb19b3c13c2d254f85a01deadadd15e80939 SHA-256: 3b78ccf2ca74405fe9d3eec2c1697662a5253f5c9a5e92ff0d4c813dba85417c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and a link farm pointing to multiple compromised WordPress sites. These sites host other PDF files, suggesting a multi-stage attack. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/66a36705bbff9760729d92f243f64ae1/gosowadefovi.pdf In PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/66063763066.pdfIn PDF document text
    • http://haumeaonline.com/userfiles/file/xowigo.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/0718e30eb1dea4d660ea51a573d5ea66/95947627450.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/ni03h73ge5s89tv29bvqeurttb/54050042663.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/1a8b401a4c4a4760dae9236a5e5723f7/nokibuzarixetasekipe.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4e7ce7f60e---notazug.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/d7d72776754dfc0c32adfe9f2864a2e0/rodixaxa.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/jj7lbvvjksa16cqc3s9gmpme71/toxekidu.pdfIn PDF document text
    • http://edu-tur.ru/userfiles/file/leguduvat.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607939bde86fb---1028877641.pdfIn PDF document text
    • http://lamay.de/userfiles/file/fesuzubogipubanodefoj.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee623b785e---96205287637.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/b68073b777be325b2f7b47a5b9d05bda/xumosoruxofuwabibovawoke.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/nt57rlg6tip2pf2p2d398am2e2/wolul.pdfIn PDF document text
    • https://sweetburden.com/upload/users/files/varikapukozovafufagowi.pdfIn PDF document text
    • http://digivideos.net/ckfinder/userfiles/files/18149241690.pdfIn PDF document text
    • https://www.tanyadantus.com/wp-content/plugins/super-forms/uploads/php/files/1958e50ea5e50721643b871c9338ba48/25030142565.pdfIn PDF document text
    • https://octvads.site/js/ckfinder/userfiles/files/76051209658.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021061302275867.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606c84242624a---wezevebojuk.pdfIn PDF document text
    • http://xn--knstlerische-biografie-arbeit-lbd.ch/userfiles/files/46645467925.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16092e8ea35814---12220248692.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=aeron+chair+size+chartPDF 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_off00012fc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FC0 10324 bytes
SHA-256: e4c5597662e342f71a6ea205fa44a0674642024afd2305e6561c9063abf79410
font_01_sfnt_off0001470c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1470C 17448 bytes
SHA-256: 35f0fe3c18d07b35fac18605815351218d2d73b4b8f2dd95d92081af369be16b
font_02_sfnt_off000174ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x174EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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