Malicious PDF — malware analysis report

Static analysis result for SHA-256 f72d126118585bd8…

MALICIOUS

PDF

88.3 KB Created: 2021-09-04 17:24:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 24a105d874ef048c31aba0c3e6bcbcaa SHA-1: be8bb24742fe94f1a6567b3d83b0b06d337a8d18 SHA-256: f72d126118585bd8e7faef1c85d699d047e855cc0acfe357b1f5e71fe8635cad
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a high ML score and ClamAV detection. It contains numerous links pointing to compromised websites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The PDF's structure and the presence of external URI heuristics suggest it is used to facilitate initial access, likely via spearphishing, leading to further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • 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.
  • 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://suncitygroup.ir/basefile/suncitygroupir/files/jivuwav.pdf In PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b4cdd9d6a05e595b030100bec40ccd93/nejekusixewa.pdfIn PDF document text
    • http://yearbookplus.com/uploads/ckfinder/files/tosolunukuwizufemebudu.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/161318bb71acf9---wesedokazofitopi.pdfIn PDF document text
    • http://slovbau.sk/test/userfiles/file/jebejomib.pdfIn PDF document text
    • https://jokerprod.net/userfiles/file/digikiwebid.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089397628196---69622211708.pdfIn PDF document text
    • http://re-view.online/fckFiles/file/8269868173.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d831181ae4d3af96489b5294575dfa67/66489055621.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/e21930dc9629318999a969271713d380/dubexorigegixiburi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160eca6df5fdac---36265008186.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/6264b65a436ad595511b88722f698325/51984321141.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/fk3o27t0dp3c2mci1vbm638d4m/kudategukowiderazoxipofe.pdfIn PDF document text
    • http://upperdublin1970.com/clients/3/3b/3b2fb281f4756d03d37a29c41a8c1d95/File/lafoxil.pdfIn PDF document text
    • http://hud101.vn/webroot/img/posts/files/zesuxusi.pdfIn PDF document text
    • http://expertsystemgroup.com/file_media/file_image/file/jovexugolo.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/neketixakulolej.pdfIn PDF document text
    • https://confetti-seasons.ru/upload/files/97717904142.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607b0ccde09a2---tomur.pdfIn PDF document text
    • https://darshanam.com/ckfinder/userfiles/files/rifajirotividofatogob.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608820a49177d---vaxawaw.pdfIn PDF document text
    • http://phuclocvienjsc.com/uploads/image/files/nepapasatagobetaz.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/eac204063f54d64abfe2bfc6b24b7896/zorusaveda.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=vinaya+pitaka+pdf+portuguesPDF 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_off0000ee02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE02 10904 bytes
SHA-256: 48ca115f1b46116f5023cbcc285f14cde2ff5e1217d361c24738268c22227242
font_01_sfnt_off00010732.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10732 19988 bytes
SHA-256: 9781cc3e221d0735e948eb53bcfd1c78f17c5759fdd3bdb360cc34afa707f83f
font_02_sfnt_off00013b50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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