Malicious PDF — malware analysis report

Static analysis result for SHA-256 17eb49ad5704f84c…

MALICIOUS

PDF

86.6 KB Created: 2021-08-19 00:48:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: c23800551ac0d70f3fb841b477a6e04b SHA-1: f8bc65811652bd9d855351652af85fad36bf5424 SHA-256: 17eb49ad5704f84c63e1bb3828e09d0153e0c7f098a6788c77587c8482203c1d
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to other PDF files hosted on compromised WordPress sites, indicating a link farm attack pattern. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of multiple compromised domains and the structure of the links suggest an effort to obscure the ultimate destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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 https://cdmsig.com/ckfinder/userfiles/files/diwiruge.pdf In PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/gmdcj8b2f9cc6o0uh47l5pa8uo/57664205293.pdfIn PDF document text
    • http://rittenhousereunion.com/clients/a/ad/ad7d26974070b67854a29702aed78614/File/betekabawulofokavused.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/97601b6bd31ef10d2ea5270531e381c2/pubuvobab.pdfIn PDF document text
    • https://readandenjoy.ae/userfiles/files/fikegezodevafavilegorene.pdfIn PDF document text
    • https://www.grdr.org/paidel/ckfinder/userfiles/files/zoxapusijazisegobajutoxe.pdfIn PDF document text
    • http://termosystem.pl/userfiles/file/44284211696.pdfIn PDF document text
    • https://shreenathtechnologies.com/userfiles/file/zagukaditagefag.pdfIn PDF document text
    • http://shreyaghoshal.com/konadnew/userfiles/file/26939084090.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160f46f05ebeb7---17547309383.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160756ee94c48a---ziliri.pdfIn PDF document text
    • http://dichvugiayphep.net/hinhanh_fckeditor/file/repewamokosutoboviraniwa.pdfIn PDF document text
    • https://aterhesseg.com/up_image/file/zupejosijiwoditanifa.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/ldap2r9hom3hjknc3o46rsnsu1/24161294690.pdfIn PDF document text
    • http://hayatteknoloji.com/webimage/file/xezuj.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/9b8e86d1af01ca95963e8b0dd5c87c00/rirakidoligasopevupe.pdfIn PDF document text
    • https://thietbiotoviet.com/Images_upload/files/80011713003.pdfIn PDF document text
    • http://lotusburbank.com/uploads/files/89301791000.pdfIn PDF document text
    • https://feng-shuiworld.com/userfiles/file/vetajofoweneda.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/16100945432137---gofokumubopodutufekupowa.pdfIn PDF document text
    • http://stavclearing.ru/upload/files/81326420134.pdfIn PDF document text
    • http://thecrayfamily.com/clients/36408/File/togapufetezovadevar.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/pozubanupow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=sample+executive+summary+for+bakery+business+planPDF 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_off0000eda7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA7 11332 bytes
SHA-256: e07692158fa7a09927926e9d5832bd26c3dbb741c65268214f0709703ceee8fe
font_01_sfnt_off0001081a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1081A 16512 bytes
SHA-256: 5bc552a18fcdc02c01bb9b06f7536e4a4374e8e35755fd24cefd5e0680b31bf2
font_02_sfnt_off000132ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1