Malicious PDF — malware analysis report

Static analysis result for SHA-256 f23eca3acfa158ce…

MALICIOUS

PDF

97.8 KB Created: 2021-09-05 22:02:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 99fd267a6672a20e9ea22f5b20b540ff SHA-1: 44ba9b7b907ea0ae597913920daf050e579f09b6 SHA-256: f23eca3acfa158ce74fc2dd9c23cd46fcfb379c88792e4288dbbffaea837d6fc
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm pointing to multiple domains, some of which are hosted on compromised CMS uploads, suggesting an attempt to obscure the final destination and leverage potentially untrusted hosting. The presence of numerous URLs, including one on a compromised WordPress upload, strongly suggests a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://george-dollie-nelson-mass-reunion.com/clients/3/33/33de80a6744892f7217a81a137582dad/File/sotisub.pdf In PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/06e4927fa1493a49764b671a3e73a66c/mekod.pdfIn PDF document text
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/83561296925.pdfIn PDF document text
    • http://27derajat.com/assets/ckfinder/core/connector/php/uploads/files/saposubelozilaji.pdfIn PDF document text
    • http://noithatphathuy.com/Images_upload/files/71011958277.pdfIn PDF document text
    • http://inercial.es/uploads/files/740602395.pdfIn PDF document text
    • https://led7.ru/file/sesirotekajenipuduzulow.pdfIn PDF document text
    • http://futimisdev.com/userfiles/file/4052748011.pdfIn PDF document text
    • http://vdadanang.vn/app/webroot/assets/files/56971556448.pdfIn PDF document text
    • https://oddluzanie.net/userfiles/file/rusaza.pdfIn PDF document text
    • https://loctra.net/userfiles/file/ziwedawezamijiguvuwuri.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/dovurijivubakufu.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/ee6874d103affc0e11a4b5948d9d4842/banelupanutakovikugepeki.pdfIn PDF document text
    • https://e-tta.com/app/webroot/userfiles/files/natoxutomifomeri.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/95837552393.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5bb2ac89d6---sakafob.pdfIn PDF document text
    • http://businessdevelopmentcenter.pl/uploads/userfiles/files/wepet.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611fe28a6d07b---demoxowavuwiriluz.pdfIn PDF document text
    • https://nada70.org/userfiles/file/26963887236.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/qgif8fpffgpd8d56gst56gv5gp/37810558807.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131652d9e194---87516528889.pdfIn PDF document text
    • https://fitness-sport.it/userfiles/file/40445963875.pdfIn PDF document text
    • http://dblbtech.com/userfiles/file/87562854983.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=internal+factors+influencing+consumer+behaviour+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_off00011aca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ACA 11324 bytes
SHA-256: 8a1d9492b1ca5ca15a9f330c1dd761aa12354691ce60ac8e943842be7a3927e0
font_01_sfnt_off000134d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014ce6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CE6 17012 bytes
SHA-256: 80c88eb287b6aa0f1451223686ce3f735d5a3c5b5a5332a9265c62f836320451

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