Malicious PDF — malware analysis report

Static analysis result for SHA-256 45ecdacfcfe7cfec…

MALICIOUS

PDF

73.2 KB Created: 2021-07-25 20:25:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 203fd033d30228eeac2070f74c983b96 SHA-1: b5da6d3f3c104bc08ec57f4bcdc4eb791a2fa097 SHA-256: 45ecdacfcfe7cfecf519973779df59a2adbd5ef020da5ea31d094f0481b91025
96 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to disposable hosting or compromised CMS upload directories. The ML classifier strongly indicates maliciousness, and the overall structure suggests a link farm designed to redirect users to potentially malicious content. While no scripts were extracted, the heuristic firings and URL analysis point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 5

  • 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://evpersoneli.net/ev-personeli/file/5133439967.pdf In PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bc30cc58fe0---xixejenumipimavuluvimibul.pdfIn PDF document text
    • http://chatsworth72.com/clients/5/53/532ec3c8dc0e95779814939736d4df6d/File/mejelunego.pdfIn PDF document text
    • https://hfbee.tw/upload/ckfinder_temp/files/20210703072029.pdfIn PDF document text
    • http://brookhavenclassof1967.com/clients/0/0c/0ca802fc87877f8c548ddf85495caeb2/File/pipave.pdfIn PDF document text
    • http://maxtarget.by/ckfinder/userfiles/files/niredupomumozejagesemut.pdfIn PDF document text
    • http://sashtraayurveda.com/ckfinder/userfiles/files/18772395161.pdfIn PDF document text
    • http://sunnysidehighschoolclassof59.com/clients/867562/File/88410676760.pdfIn PDF document text
    • https://trellisdundee.com/wp-content/plugins/super-forms/uploads/php/files/b29195f8f8cbe6a9cfcc0b27ad8bb0bc/vepakux.pdfIn PDF document text
    • https://nutstudio.it/userfiles/file/xawalitopireno.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/uptj1vo4p6c6uqur8ko5mg8fpc/48816520161.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/togikefupiguperakaku.pdfIn PDF document text
    • http://kapsalonindex.nl/images/uploads/19568827477.pdfIn PDF document text
    • http://brightwayconsultancyservices.com/userfiles/file/zetuzalelujox.pdfIn PDF document text
    • http://samtekelektrik.com/files/binolafavigizokujatoji.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/21bba62995c434ead92377fe84c64c03/86279977965.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/17882650385.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/20au3psjij24kqdq2aenvaqfv7/12712759756.pdfIn PDF document text
    • https://myveolife.com/wp-content/plugins/super-forms/uploads/php/files/4cedb5340aaf57cfaafa84d3814d1ee0/folewurufegezajosa.pdfIn PDF document text
    • https://study4student.com/cache/fck_files/file/sujetalisivorejaz.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/ec6bc8097101fc29e06e532acf95c159/42787048640.pdfIn PDF document text
    • http://artgraf24.pl/userfiles/file/supejasinotikasopisen.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/c6003297a2eaa27654d82b3e8fe5beab/68642704058.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=jesus+mi+fiel+amigo+letra+yolanda+y+deboraPDF 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_off0000bba2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBA2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d3b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3B9 11040 bytes
SHA-256: 7202e2145e28de30b077f48471a2ab4783132bf59b338392f900173e23cb9886
font_02_sfnt_off0000ed3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED3B 16800 bytes
SHA-256: 168a62d89ee969ac50484f63a0f7a0a8ca66312f1e31862a40f08ee5d3941af3