Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5291d3bfd43cb76…

MALICIOUS

PDF

73.4 KB Created: 2021-09-09 17:20:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: af76ba1fae144b85961a2cc678e3527a SHA-1: 80036521dbb5c6b8d811fb4ce1a8b9338f992d1b SHA-256: a5291d3bfd43cb76294a3db66b95158f08e815aba5209d92c4eb41d1acf7c776
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by an ML classifier. It contains a link farm with multiple URLs pointing to compromised WordPress upload directories, suggesting an attempt to host or redirect to malicious content. The presence of embedded URLs and the nature of the link farm indicate a likely phishing or redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8442

Heuristics 4

  • 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
  • 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://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613663317a899---16591879036.pdf In PDF document text
    • https://worldpigment.com/image/upload/File/59840350225.pdfIn PDF document text
    • https://www.lucaslobker.com/minor/ckfinder/userfiles/files/16815158674.pdfIn PDF document text
    • https://comfortinnbarrie.com/phpsites/vertical_living/uploads/file/46353258999.pdfIn PDF document text
    • http://xn----7sbab1bcaqplb0ccyi9d.xn--p1ai/files/file/83668406495.pdfIn PDF document text
    • https://www.jakketoes.be/ckfinder/userfiles/files/95397343914.pdfIn PDF document text
    • https://huuphongplastic.vn/uploads/images/files/wurufazusu.pdfIn PDF document text
    • https://amzentransportationindustries.com/admin/imagetemp1/file/9071874185.pdfIn PDF document text
    • https://www.gurkhasfinance.com.np/ckfinder/userfiles/files/kubobo.pdfIn PDF document text
    • http://cappellastudio.it/userfiles/files/31001395413.pdfIn PDF document text
    • https://fereshtegan.net/basefile/fereshtegannet/files/83341859575.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16131b25de01ec---64294048559.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/k2vivlg1djhvm24gt71c96lub3/81839616930.pdfIn PDF document text
    • https://accidentmatters.com/ckfinder/userfiles/files/50234244349.pdfIn PDF document text
    • https://rajakedua.com/contents/files/bugixolut.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/071835076554.pdfIn PDF document text
    • http://tjtvina.com/Upload/files/nobepepasedow.pdfIn PDF document text
    • http://qianlong99.org/ckfinder/userfiles/files/11584821823.pdfIn PDF document text
    • https://egc.ecrom.work/syo/files/8531314494.pdfIn PDF document text
    • http://baikalspring.ru/ckfinder/userfiles/files/bixiwamifolupev.pdfIn PDF document text
    • https://marosme.ro/hirek/file/16561463583.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/miradekuwisideveveduwuvo.pdfIn PDF document text
    • http://laserinnsbruck.com/static/26286373575.pdfIn PDF document text
    • https://mmszke.hu/files/file/bejeru.pdfIn PDF document text
    • https://hamzakocakoglu.com/userfiles/file/palagaparajuzomuxebutun.pdfIn PDF document text
    • https://vannordenvastgoed.nl/userfiles/file/dexawipofexitugu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=the+best+offer+watch+online+freePDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e396.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE396 18168 bytes
SHA-256: 7556b2e6c81a2feef176e143f4dbbcde6a4a86b571557e55ac556bea8a2fb593
font_01_sfnt_off000112a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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