Malicious PDF — malware analysis report

Static analysis result for SHA-256 a26e28d1f83e0467…

MALICIOUS

PDF

83.7 KB Created: 2021-09-01 16:12:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3bd5916ee6228c81bff28fe0853b2670 SHA-1: 0e811e15ec19919f01a3eed0410d4aef1efa974f SHA-256: a26e28d1f83e0467348c05dc584ad20ad3884febe381d3a0a913b4ec6726d274
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF document that exhibits characteristics of a phishing lure, as indicated by the 'SE_INVOICE_LURE' heuristic. It contains numerous embedded URLs pointing to potentially compromised websites and disposable hosting, suggesting an attempt to redirect users to malicious content. The ClamAV detection and ML classifier further support its malicious nature, likely serving as a delivery mechanism for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c7b6c21ecca---vufanavovaje.pdf In PDF document text
    • http://imreelectric.sk/uploads/file/24702794510.pdfIn PDF document text
    • http://fmafirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dozidimunu.pdfIn PDF document text
    • http://pitafest.com/clients/1/13/1337b7689af00ddd847345d48bd720ff/File/65421498615.pdfIn PDF document text
    • https://familienbilstrup.dk/userfiles/file/likamefoporezijejogawup.pdfIn PDF document text
    • http://easyreturn.store/userfiles/file/xiwagovuwobimo.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/278nkp4h9rr9510e724bjsg3m7/13998768278.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc4e7dbab4e---dezilina.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb69ecc37e---zibimeborotabizebekawiz.pdfIn PDF document text
    • https://elearning-chemistry.ro/userfiles/file/dajekuronemaresidawixir.pdfIn PDF document text
    • http://armanetti.com/images/64637006316.pdfIn PDF document text
    • http://lukoilmarine.com/ckfinder/userfiles/files/gelapo.pdfIn PDF document text
    • http://wirheiraten.de/images/file/45392141435.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/100aiegvgllkp6p0k5k5hpb1j5/27587504453.pdfIn PDF document text
    • https://safrano.pl/userfiles/file/30495007466.pdfIn PDF document text
    • https://hmanagement.net/userfiles/file/zezitatutikukoka.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/29177625586.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/fd331bf312ba63b05f9e6d3e8454eb8b/mebegorefufemodojewamekip.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/189e0fc1c372a5c232d29a621e462ccf/lugetanofupajovul.pdfIn PDF document text
    • http://alrabbanoilandgas.com/file/files/40047264933.pdfIn PDF document text
    • https://walnutcreekguide.com/wysiwygfiles/file/ropojudefesaza.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f07906a11c4---31868554626.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160ed7aed77010---bumusigofemozofonujupaxu.pdfIn PDF document text
    • http://onroerendgoedindex.nl/images/uploads/53768085029.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/505098803a90401ef89c1cc411e84383/19431604042.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bda257a9537---74762595978.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=card+numbers+for+robuxPDF 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_off0000e20e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE20E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA20 18008 bytes
SHA-256: 57520e1ad6068a15a8500d6e68e0f4ec858540d2f04abd2332e976f30e8578af
font_02_sfnt_off000128d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128D1 10652 bytes
SHA-256: 57ac9af7f0631cf17c6d7214d2691a9b0c0343d4b8bf7964b44bc448a8499bbe