Malicious PDF — malware analysis report

Static analysis result for SHA-256 6665ccf5c0640ecf…

MALICIOUS

PDF

86.5 KB Created: 2021-09-06 11:51:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d06726ef213526ecb0976eb5d6b634cf SHA-1: e82153051360e89958ad90b40feb6aec32074a07 SHA-256: 6665ccf5c0640ecfb09c41ea9da73a2e48369afc782a75dc53269a346e88e94f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the nature of the heuristics indicate that the document is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://smidgel.ru/uplcv?utm_term=role+of+education+in+political+development+pdf PDF link annotation
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/a77bf7fa23f8d6e66c97b68f84110455/vinakewazev.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d49a8d1523---gitutogakatemape.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/bprq5lob2gkl4p02oqmjqr3ok5/59648745202.pdfIn PDF document text
    • http://i-daa-wl.de/userfiles/terupuzujapabawikatif.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ffbc2d413c---jipetivurelixatulasuluma.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb7c97da3b---nidilerifo.pdfIn PDF document text
    • https://habibitours.org/ckfinder/userfiles/files/69288289492.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080cf111bae3---81979460938.pdfIn PDF document text
    • http://rpsbchamber.org/editorData/file/56796910418.pdfIn PDF document text
    • http://frappsreagent.com/upload/files/mawil.pdfIn PDF document text
    • http://zhuoer.ltd/userfiles/file/fixevaba.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce5200b6e7---40066875587.pdfIn PDF document text
    • https://harrisitalia.it/uploads/file/sufabejujajokalipokodinin.pdfIn PDF document text
    • http://ikhmongol.mn/ckfinder/userfiles/files/96300088039.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/160823cb79e8b3---76372686869.pdfIn PDF document text
    • http://massimosusto.eu/userfiles/files/24526745296.pdfIn PDF document text
    • https://thanaclusterwestgate.leaddeehub.com/userfiles/files/napubugizosat.pdfIn PDF document text
    • http://traslochimontalto.it/userfiles/files/viretefewegadaragapopobo.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/ue544l2a42k2qffs0knil7vum3/zawesilekotevoribanixa.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/44d97c5d7f5f7850a61435afd3f8775a/62036574049.pdfIn PDF document text
    • https://webhosting4.net/media/file/mikudukina.pdfIn PDF document text
    • https://farmstead.tw/farmstead/upload/files/basixulibefijizotu.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/98144696330.pdfIn PDF document text
    • https://mollis.rs//files/71846982123.pdfIn PDF document text
    • http://18554080.com/userfiles/file/bamulit.pdfIn PDF document text
    • http://helderlive.nl/ckfinder/userfiles/files/nuvigexukodipoz.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_off0000ec38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC38 18280 bytes
SHA-256: 5c4825153c59c5062a190fe1aac9d3a9cab57a82221f73b3f4a62b90fcdf6db3
font_01_sfnt_off00011b24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B24 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001333b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1333B 10724 bytes
SHA-256: e386608d8b5ebb25bef636d7dad1b238eb9760ab61f599a0431882a70f04206f

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