Malicious PDF — malware analysis report

Static analysis result for SHA-256 83047118e44ad9c5…

MALICIOUS

PDF

87.5 KB Created: 2021-09-04 12:55:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8577d509766c9247de6836d9e5e606db SHA-1: 4944f05118e81dc498f9a48cb541a3309aa14cbd SHA-256: 83047118e44ad9c5205fa7fe3c66e13ae402517f238a4a2f1c2286fb9d2b6cca
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely redirects users to external sites, as evidenced by the numerous external URIs found, some of which point to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://bouveau-consulting.com/userfiles/file/gevegabugevavubalasaxo.pdf In PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/1c0fc4d6fa415134b59f1a5d5afb9290/50290994074.pdfIn PDF document text
    • http://sicilyontable.it/userfiles/files/14425988232.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/15608889468.pdfIn PDF document text
    • https://buka.ru/sadm_files/68710173090.pdfIn PDF document text
    • https://canevastoilestjean.com/upload/editor/file/49845722260.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5f5dd68dda---zatavomulilezapika.pdfIn PDF document text
    • https://trinityautorepairs.com/uploads/files/lusexonulazukodisulid.pdfIn PDF document text
    • http://4yoga.by/pics/files/69640728160.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/89901e71725fb526448116c6d0cec302/39071978668.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb94cd5072---86331252262.pdfIn PDF document text
    • http://kidsjeodo.com/images/files/98946201978.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/9995o8gtfb5g282csmmj2v5onh/zixalu.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/5ihr8hrm2an9ao7r0e9k7el5r1/zalifewonovokamuta.pdfIn PDF document text
    • https://pirkitpadangas.lt/ckfinder/userfiles/files/48580107089.pdfIn PDF document text
    • http://gamjagolla.com/uploads/files/77913335440.pdfIn PDF document text
    • http://bestorkate.com/uploads/ckeditor/files/jagigozozobu.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099ae6a8891a---pakezonower.pdfIn PDF document text
    • https://yucekalipmakina.com/tsrm1/img/userfiles/file/pusepasafejipomexivalaw.pdfIn PDF document text
    • http://nawaress.com/webroot/js/ckfinder/userfiles/files/pefas.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16078a3da160ab---kibomulufeludodeg.pdfIn PDF document text
    • http://toddfamilyreunion.com/clients/4/48/482e924d5a052aa4a0c13eb8a30e0bc8/File/loxuloxovilenikugepugilu.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/2da43ea464dd9de45ac7374ca736a33f/4200304563.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=police+codes+usa+pdfPDF 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_off0000f1b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000109c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109C9 10412 bytes
SHA-256: 78e6acb692548c4de7e087d586258eb0dfb583081dfdb8d618e4a25818eba328
font_02_sfnt_off0001217a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1217A 18620 bytes
SHA-256: a082224a47a2cb3ddf50f96bbad3087376161f1ac832c5201d4273d12e57ce18

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