Malicious PDF — malware analysis report

Static analysis result for SHA-256 dda5f00ddbc4fda7…

MALICIOUS

PDF

101.8 KB Created: 2021-06-29 08:50:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 189e6e9e3d3fad5bccb86882ae345c4a SHA-1: 8fe61a95ceaabce49c84996a7c07b0079a705122 SHA-256: dda5f00ddbc4fda758f81f7c5f8edd9a25acde8025a92fd631a4237daa225461
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the link farm and the PDF structure suggest it's intended to lure users to malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a3aa79b8924---93158181149.pdf In PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/c6dbd21eda5b5808c721ac82c27d4125/20683590387.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2ca67a2323---xisesulefiw.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/e1e17ae8941700d95730d7c6242313ab/bewez.pdfIn PDF document text
    • https://soechi.net/userfiles/file/72636706613.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607bcbac525b7---mulajoze.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16074b8238644e---majetujalifagozaworo.pdfIn PDF document text
    • http://szymonadamczyk.pl/uploads/fck/file/lavafowo.pdfIn PDF document text
    • https://p1gtac.com/uploader/files/vimesefegakafumowi.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16085822fc73be---velewepadixesop.pdfIn PDF document text
    • https://feng-shuiworld.com/userfiles/file/80258490679.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/cvjnso6jnh41bius3l5h5tot7a/73566783178.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/fc3360a915842f2a9863bb56186e0caa/52748272890.pdfIn PDF document text
    • http://stylowa-pss.pl/userfiles/file/buvetirafufij.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16084acf703e1d---podososope.pdfIn PDF document text
    • http://taiwanglassgroup.cn/userfiles/file/34101890015.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/4edfe662de1b7739d3686ac238c7a208/tagagomapimepavovesu.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4ed00bcd98---rekokeladakuraxena.pdfIn PDF document text
    • http://fairway.cc/images/blog//file/wusokalexakufut.pdfIn PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/21571414682.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=home+remedies+for+stomach+bugPDF 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_off00012a5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A5F 17560 bytes
SHA-256: bc939d4d67756fe786947478040b5774a7faef96067e15c4edb89f2efbe190c8
font_01_sfnt_off000158c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000170dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x170DC 11004 bytes
SHA-256: 98214f8e24b7f35c169fd2e1c6b185572165ad51f57a98e6a1ceeed3ad728e1f

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