Malicious PDF — malware analysis report

Static analysis result for SHA-256 adac46005fdc99a3…

MALICIOUS

PDF

83.2 KB Created: 2021-09-05 02:57:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: fdf1ec6e328a9823277cffdf32d8b0f1 SHA-1: 86e1d48900497ccbd0a51811a10aa9016f1491a2 SHA-256: adac46005fdc99a3103b79adaa7819a55daf50385e0d9c9001385f08df89db0e
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent. The primary attack pattern involves luring users through a document that, upon opening, redirects them to potentially harmful external sites.

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 https://permargi.com/files/galeria/files/wirolumoxobap.pdf In PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/duzegudapifexikokotufo.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a72e14baa12---16407487767.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078c8165ab5a---95004862666.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/d5c80dca3b952ed8e9efb8f3d3f48b9f/9141816571.pdfIn PDF document text
    • http://thailaundry.com/imgUpload/files/91679832040.pdfIn PDF document text
    • http://rockhouseschool.com/rockhouse/uploads/files/sagoxefibaxek.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bee1f6bd2f1---19938799895.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a885d53e507---waxijinu.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a5cb2eb5c9c---86300606294.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/o6fdhj8134jjuknd9me61k5lcm/rekukox.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/d6097b33383628d8591dfdfe729d3cfa/bidejusejatujuginax.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608582751d4f5---74270946333.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/6450acb2766908b1e509bcbd70c6dfe2/dugaduvinanowilisaninijew.pdfIn PDF document text
    • http://klawiatury-foliowe.pl/_data/file/jovamukevikujifowifi.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c44b360f276---4558380789.pdfIn PDF document text
    • http://licausi.it/userfiles/files/ketexok.pdfIn PDF document text
    • https://monuments-msk.ru/wp-content/plugins/super-forms/uploads/php/files/70645761483f0cdb39c1b740cfb141ef/90408398070.pdfIn PDF document text
    • https://houstoncoinshow.org/FCKeditor/file/zewevebuwurafoxuza.pdfIn PDF document text
    • http://issaproject.com/app/views/panel/ckfinder/userfiles/files/74554834510.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be2d45606c6---bagaz.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b3abf97c5ed---mogug.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607d98599dcf8---vijulefirifike.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=sor+callista+roy+biografia+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_off0000e0f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f908.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF908 10888 bytes
SHA-256: cd65d5f261ce9b9d516cdabdc0f648d362c1a0bf20b3e50934437f69b25d347b
font_02_sfnt_off000111e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111E7 17384 bytes
SHA-256: 765bedd7436e69429adcda50f5184b1c3b22f37669bc39f20591c4b00d2a545a

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