Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebc73eeb335b183b…

MALICIOUS

PDF

84.8 KB Created: 2021-09-07 07:30:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9051d47bc9d21ff70624dbc00e0a110f SHA-1: 8220e435ec2a1370497f9aba722f1d2f322c49c5 SHA-256: ebc73eeb335b183b6c9adf80d1116b95442f44a55fcedb05ac1b04863c8c7610
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF functions as a link farm, pointing to numerous external URLs, many of which are hosted on compromised CMS platforms or disposable domains. This suggests the document's primary purpose is to redirect users to potentially malicious websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://jfhcoaching.nl/userfiles/files/45115484944.pdf In PDF document text
    • https://krzczonowice.pl/gfx/file/lelabuxugagunusebetu.pdfIn PDF document text
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/kalagotatunuzeto.pdfIn PDF document text
    • https://scalping.ir/data/files/file/pazolegorovanip.pdfIn PDF document text
    • https://thegmsbihta.in/userfiles/file/39396999411.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/qdfkt3sbrv8fv7lbsufh69471o/85675851455.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/be828aa3498cabf3561ab7d6c8929e74/vilek.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606caaa11e283---97916530929.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc2e28f9fe---zixirikiviradojevided.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/64727535504.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//37113237059.pdfIn PDF document text
    • https://craftsmancuttingdies.com/wp-content/plugins/super-forms/uploads/php/files/b5f3bdbbfee3c0ece8837dd483b9786d/dukapore.pdfIn PDF document text
    • http://mengnuanua.com/app/webroot/files/files/japotosoxajopogupigi.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5ccaf8012d---94494531042.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/5ddaf2af34cb521516b69330b503d240/17652501562.pdfIn PDF document text
    • https://jobtiara.com/files/files/ralozexuvo.pdfIn PDF document text
    • http://bbbswalkforkids.com/clients/c/cf/cf8d0549bdc9bbdffca8bc0db9808b96/File/96507492260.pdfIn PDF document text
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/lac7q3oepanfjtl4oc2eumf6al/dopuzo.pdfIn PDF document text
    • http://rzn-house.ru/upload/file/bazalonapabetupux.pdfIn PDF document text
    • http://cathugo.de/res/wysiwyg/file/90636657122.pdfIn PDF document text
    • http://greenmodels.ru/uploads/files/kimurajukawano.pdfIn PDF document text
    • http://border-inn.com/CKEdit/upload/files/rimulizineridezuxamekugut.pdfIn PDF document text
    • http://eska-lift.ru/userfiles/file/80989258836.pdfIn PDF document text
    • https://damiel.eu/userfiles/file/keganovisaz.pdfIn PDF document text
    • https://universitecentrale.net/uploads/FCK_files/file/23326964670.pdfIn PDF document text
    • https://businessincasey.com.au/application/third_party/ckfinder/userfiles/files/85179966177.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=vnetphone+v8+user+manualPDF 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_off0000e6a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000feb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB2 17888 bytes
SHA-256: 8f163d7d29a52b62d4f3b47ed3e05915644b3372401a13a155d24e1005005612
font_02_sfnt_off00012d53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D53 10768 bytes
SHA-256: ab27d71414d20d3c231b95a7480bb2de314ac22f5e92aa59bdf805bdab5d5001

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