Malicious PDF — malware analysis report

Static analysis result for SHA-256 98456ff97314daf5…

MALICIOUS

PDF

85.3 KB Created: 2021-09-05 07:45:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 52566fa113c25c2a1815b80411ca8de2 SHA-1: bd62055e1358ed318cf467d499221734392eb312 SHA-256: 98456ff97314daf52435af75e9c014f4c1b6df6c3f48e2d4f024c5336260979d
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs that form a link farm, directing users to various external sites. Several of these URLs point to compromised CMS upload storage or disposable hosting, indicating a likely attempt to distribute malicious content or phish for information. The ML classifier and ClamAV detection strongly support the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://sylvianapoles.com/clients/e/e6/e63d90d46a840f0b3195f531cec11f6e/File/tudavoxiruzuradom.pdf In PDF document text
    • http://ansing.nl/userfiles/file/44705410701.pdfIn PDF document text
    • https://projetovm.com/uploads/files/dugefatejemew.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/v3jav35cc5t8kelpc6lv1ecp1r/9131556416.pdfIn PDF document text
    • http://awarelaxcentrum.cz/user_files/file/jujuleg.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce903d780a---vikimofemelarigekix.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/c5dfcbd41425a4666c654e1982b41f4e/73175149590.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160cf051205a34---bukodefurudofujo.pdfIn PDF document text
    • https://systematix.pl/userfiles/file/21470232964.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1611df2d74ed0f---75220825630.pdfIn PDF document text
    • http://yongqingtech.com/d/files/rawujoboxatirodunegoj.pdfIn PDF document text
    • https://deniz-sogutma.org/img/userfiles/file/novoboniwi.pdfIn PDF document text
    • https://akonis.ch/userfiles/files/37628567896.pdfIn PDF document text
    • http://vhs1970.com/clients/873287/File/58560025723.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16128f172577fa---9632699141.pdfIn PDF document text
    • https://mobile-translator.eu/app/webroot/media/files/xurob.pdfIn PDF document text
    • https://aynispirit.nl/userfiles/file/98192405210.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/1302823991.pdfIn PDF document text
    • http://lhdrum.com/User_File/UpFile/file/20210809220523_cGlkaXNpa2l0YXJhanVwYXNlYg==.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fbc822b70b6---62755312073.pdfIn PDF document text
    • http://shoreluxurylimos.com/userfiles/files/bofujagejasupivofakip.pdfIn PDF document text
    • http://www.aportecnica.com/imagenes/editor/file/4130107287.pdfIn PDF document text
    • http://physocare.com/Images_upload/files/rijolutuvevopanadipopo.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/55c28cc0b939f554b1c3ba122269d0f2/93535130761.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=german+a2+course+pdfPDF 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_off0000e28d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE28D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000faa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA4 10804 bytes
SHA-256: 6e741aea61f0da27761af078612cb24c179509b6c366fccf68bdbc1e7ebabb78
font_02_sfnt_off00011398.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11398 20820 bytes
SHA-256: 922570d7965fc944843cd7543579526b5f0c21aeee65397016c8f97a04ddb491