Malicious PDF — malware analysis report

Static analysis result for SHA-256 04590abcb50a654d…

MALICIOUS

PDF

89.4 KB Created: 2021-08-12 09:50:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 7b53fdb57b492a39977d48ce75ddf640 SHA-1: 91e1eed92f1a00bd52a39f25c20c5b5419db9d67 SHA-256: 04590abcb50a654d025ebf1c603ad4b5a2895ce0686297fbffea984949f33784
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. It also exhibits characteristics of a link farm, with numerous URLs pointing to potentially compromised or disposable hosting, suggesting an attempt to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://vandientuchinhhang.com/upload/files/pafemepusakuvev.pdf In PDF document text
    • http://okna-dvere-online.cz/media/upload/upload/file/lixagexibemidigapitezom.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/zepokefijogasarimolaguke.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071d408b748d---busesadumumupoli.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/161038497d60c3---43553969004.pdfIn PDF document text
    • http://jump360.co/upload/files/20210624043142.pdfIn PDF document text
    • http://magooferta.pl/uploads/fck/file/piwajevofodaxuzamafemiluf.pdfIn PDF document text
    • https://gachbinhduong.com/upload/file/3742092845.pdfIn PDF document text
    • http://docando.es/js/ckfinder/userfiles/files/29413863755.pdfIn PDF document text
    • http://proxima-design.cz/files/file/69814777524.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/tc85roeeq0vu505q73cls3spks/luganeradopowelugopidabi.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/4530a41aea7e9155acb5e78b07c628bb/15930881321.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/5a02e41b463d3267f686d0aa92d94d89/bifawonobiguzowov.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ba607ea43ee---kolofagenajevelomu.pdfIn PDF document text
    • https://spitalmoldovanoua.ro/ckfinder/userfiles/files/xefaxirisodubogilufo.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608feeb655c58---vepowofovorovejakav.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/keximemu.pdfIn PDF document text
    • https://papiratisk.cz/soubory/89074939183.pdfIn PDF document text
    • http://www.waetsukai.jp/system/ckfinder/userfiles/files/36548431077.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e1e5f524eb---14254280703.pdfIn PDF document text
    • https://www.autodepotperformancegroup.ca/wp-content/plugins/super-forms/uploads/php/files/n2k8pnj41nfkmguims78buj010/nolofu.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/7c3b1224515e506b33ac1bb865856419/sonugipusufobovumogamul.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/161081c53dd615---jawuziwavolawura.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=baojie+bj-318+user+manualPDF 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_off0000ea8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001029e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1029E 22264 bytes
SHA-256: 07c6ef85b92adc358ffa97704a031843f172404cb84d939ef80313343ddc0fb7
font_02_sfnt_off00013bc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BC2 11060 bytes
SHA-256: 80383ae14b158ce10897eaeaf22f083e507f98a26b13feaba38a3276dc0064ce

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