Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dfd61b623ebc72c…

MALICIOUS

PDF

81.9 KB Created: 2021-09-01 07:18:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a51a296a387b3e00bd2f3652d499ad80 SHA-1: b97d02d856448f08285d4f5de59ba740e7a37d25 SHA-256: 9dfd61b623ebc72c029e085bf4fa0e88926e9a5738aa9dbfb04389ac71f394a4
156 Risk Score

Malware Insights

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

The PDF file contains a link farm, directing users to multiple websites hosted on compromised CMS platforms. Several heuristics indicate this behavior, including 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM'. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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 https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/1b85e22b4861fb9bdbcfb9f0f4f6d30d/55520148060.pdf In PDF document text
    • http://innovad-ltd.com/userfiles/file/kobametekokiwafisiz.pdfIn PDF document text
    • http://ues-rb.ru/themes/ues-rb.ru/files/44009876191.pdfIn PDF document text
    • https://idd.no/ckfinder/userfiles/files/83946331275.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/s09lm906v128ku49uaaqu84rf0/73269242896.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612cad6c5d988---89374716969.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/834156beb8247ade9e3ac700a0aa892f/22736986010.pdfIn PDF document text
    • http://geose.ru/userfiles/file/gopizapexejoguj.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2fe1db40ae61143ab15011d9b136b15e/85675105749.pdfIn PDF document text
    • http://cameragiaminh.com/upload/files/sagesawutixiwugo.pdfIn PDF document text
    • http://studioguatta.it/userfiles/files/12367706632.pdfIn PDF document text
    • http://zhjpharm.com/upload/files/fotominuzizurisuzileten.pdfIn PDF document text
    • http://aktifbant.com/resimler/files/gonilusabiru.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b58ba8e8573---96906772367.pdfIn PDF document text
    • http://orchid-daikanyama.com/userfiles/file/12240818489.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/450e4048b7d69d77b1cf6a67d886a771/54730186364.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/fozerovag.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8e6e6b5067---narulemolanupixufoba.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/30c692d86ea56df5f819ffbee3b3ad70/99377550710.pdfIn PDF document text
    • http://dush-kz.ru/uploads/fck/file/miforatelutewawom.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160c414bcebd42---19868145335.pdfIn PDF document text
    • http://kameleonhastanc.hu/files/file/dazibelumojudolepi.pdfIn PDF document text
    • http://eviljoy.com/UserFiles/File/bonenus.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/17107749474.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d5d5629aa22---kilawujufifojezepitixo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=get+a+tune+up+near+mePDF 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_off0000dd75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD75 17580 bytes
SHA-256: 8cb7c0e78f139f5226c7035b2befb225cf85bacf4f5fa12777b7176cdd2cc463
font_01_sfnt_off00010a8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A8E 10124 bytes
SHA-256: 951fd1c3d46e9e09b8098a159e57807f0b64a3bada8fd902c085d5e2db05209e
font_02_sfnt_off00012123.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12123 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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