Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a3036a8094c3514…

MALICIOUS

PDF

93.1 KB Created: 2021-09-17 23:31:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: cc4a7e4875fd94e59ec7228d94eb96af SHA-1: 8f059db39f9a36e6886166e3192b20f53768fb2f SHA-256: 9a3036a8094c3514ab2603e3fe7e6913d99508a616e496e902fd5838e3661106
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics identify it as a link farm hosted on compromised CMS upload storage, with numerous links pointing to disposable domains. The primary purpose appears to be redirecting users to potentially malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/1613282602c8e5---47081519829.pdf In PDF document text
    • http://huijingweb.com/upload_fck/file/2021-9-13/20210913215446598842.pdfIn PDF document text
    • http://friulanapanini.com/images/file/25451927609.pdfIn PDF document text
    • http://nfraccon.org/userfiles/file/67761646826.pdfIn PDF document text
    • http://koopmankennedyfeller.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kujokojitijejabovutim.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec9fbe99a1---29386175123.pdfIn PDF document text
    • http://borneneskontor-landsforening.dk/userfiles/file/21268645841.pdfIn PDF document text
    • http://pk.mo/userfiles/file/dabutafofe.pdfIn PDF document text
    • http://gestioniarmatoriali.it/27003736022.pdfIn PDF document text
    • https://traiteur-troyes-mariage-buffet-aube-10.blaisot-traiteur.fr/ckfinder/userfiles/files/56625262953.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1613c185a51e40---30546603931.pdfIn PDF document text
    • http://vindindex.nl/images/uploads/nedusezagakilajodovu.pdfIn PDF document text
    • https://uleiuri.ro/userfiles/file/nofivigunid.pdfIn PDF document text
    • http://dasbluemchen.com/88446315727.pdfIn PDF document text
    • http://helloslow.com/data/userfiles/files/23967751793.pdfIn PDF document text
    • http://bettynblue.com/upload/fck_img/20210913/file/54281503004.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/cc213dfe208597b65815b5d6d171d249/dugetexuvarij.pdfIn PDF document text
    • http://cgpreceptor.com/ckfinder/userfiles/files/vusimogizox.pdfIn PDF document text
    • http://osmed.cz/app/webroot/files/files/4831464537.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/161363ab236a95---21647919807.pdfIn PDF document text
    • https://silverstonedevelopments.com/ckfinder/userfiles/files/85292111275.pdfIn PDF document text
    • http://zangerlelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/75889743712.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=twd+s8+e11PDF 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_off00010802.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10802 18896 bytes
SHA-256: 1c545525bad2c2a9be73afdf482f70c8874da27b5a21702d513b17acf3d9e5cf
font_01_sfnt_off00013960.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13960 9828 bytes
SHA-256: f3d630b801bf330d1760a5f75b83ad40f79776a4c904238341cb0176f32e55e2
font_02_sfnt_off00014f27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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