Malicious PDF — malware analysis report

Static analysis result for SHA-256 66eef18d3e731012…

MALICIOUS

PDF

81.7 KB Created: 2021-09-03 13:47:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: e609f8c62f11a70f2aa8e8949243dc9b SHA-1: eafe3d1721ddf525e7b04ee0ce1b2b95bab0e862 SHA-256: 66eef18d3e731012b7a92fdee88f7680768ee277ab6ec0967044f8979be5a309
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are associated with link farms and compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to lure users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://huntic.ru/uplcv?utm_term=complement+system+function+pdf PDF link annotation
    • http://bright-mineral.com/uploadfile/file/2021061413564841.pdfIn PDF document text
    • http://bolshunoff.ru/images/wysiwyg/file/42337305989.pdfIn PDF document text
    • http://eviljoy.com/UserFiles/File/20611532389.pdfIn PDF document text
    • http://clingac.com/d/files/99259371647.pdfIn PDF document text
    • http://kristenpell.com/userfiles/files/33191961072.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/58182286768.pdfIn PDF document text
    • https://yz-yongzhong.com/upfiles/editor/files/46146752292.pdfIn PDF document text
    • https://keralatemples.info/ckfinder/userfiles/files/6337441889.pdfIn PDF document text
    • https://pelicanfinancialnetwork.com/ckfinder/userfiles/files/56933115154.pdfIn PDF document text
    • http://talleresjpg.es/img/file/wokumawe.pdfIn PDF document text
    • http://slavutich-media.ru/userfiles/file/zajemunoximaxibura.pdfIn PDF document text
    • https://ajansnigde.com/resimler/files/89462307344.pdfIn PDF document text
    • http://phanmemerp.vn/attachment/files/54915078380.pdfIn PDF document text
    • http://vhktn.at/images/content/files/6135892825.pdfIn PDF document text
    • http://rasmesafar.net/basefile/basefiles/40594366954.pdfIn PDF document text
    • https://akemi.ro/hirek/file/fejurizafivakod.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160868d2c7e768---75843368284.pdfIn PDF document text
    • http://famillespourstarlight.org/clients/a/a9/a9b42c05011d3bb27e7f7ec2ed30324f/File/9451774528.pdfIn PDF document text
    • https://xn--fiqa735be48e.com/upload/files/fepikud.pdfIn PDF document text
    • http://loscogliodifavignana.it/userfiles/files/133796617.pdfIn PDF document text
    • http://atek-ent.com/upload/file/newuxuj.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/2a75aa0a318f2c857deed5f72d3dcda8/bufidupofuzurikose.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/ac8873f0e646fd1d2f28734c3376a12b/mijododutoxilurutu.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/16078e4d6132a8---kikekanumivenupa.pdfIn PDF document text
    • http://villahetzwartepaard.nl/survey/userfiles/files/sirajojokufodamupake.pdfIn PDF document text
    • http://gdbchurch.com/clients/43262/File/44536472821.pdfIn PDF document text
    • 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_off0000dbcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBCD 17260 bytes
SHA-256: d5aa447049cad014e38cb09cb57b9aea43192feee97b99f260f68c0425148b2e
font_01_sfnt_off000108a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108A2 10764 bytes
SHA-256: b4346cb012013bced079321e6875e27db91ee7a85fa927cb60784f862c5e87dd
font_02_sfnt_off0001216b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1216B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1