Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd40049a0cdf71ce…

MALICIOUS

PDF

84.7 KB Created: 2021-09-16 06:28:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e280a55d5d58e1537f264a286b4e0777 SHA-1: de96063d839cd411eb7b1ed565c85eccdecb2ae9 SHA-256: cd40049a0cdf71ceb172a90ae5899fe2528b328d9a02fa4ecd24407f179e1630
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a link farm pointing to potentially compromised WordPress sites, suggesting an attempt to deliver a payload. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway security. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://uptindia.com/newsimages/file///semuwaj.pdf In PDF document text
    • http://z-sinpro.com/upload/files/gubipugerevazu.pdfIn PDF document text
    • http://cokhiminhhien.com/media/ftp/file/2334553676.pdfIn PDF document text
    • http://chronocertif.com/userfiles/file/53269553314.pdfIn PDF document text
    • http://acevina.com/webroot/img/files/95504099296.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/4458dd0394b9c669942f4ed527560959/tozilitiba.pdfIn PDF document text
    • https://pmrmhss.com/userfiles/file/36813097524.pdfIn PDF document text
    • http://groupkaishan.com/d/files/38024399590.pdfIn PDF document text
    • http://aimecostruzioni.it/userfiles/files/5491616436.pdfIn PDF document text
    • http://symbioticlifetech.org/attfile/fckimg/file///2021091692258_259125845.pdfIn PDF document text
    • http://pnalog.ru/images/file/judomepikukoterupeto.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16142422a1409d---73670307306.pdfIn PDF document text
    • http://rajhansnursery.com/userfiles/file/zowuripatapikit.pdfIn PDF document text
    • http://ansing.nl/userfiles/file/47753377957.pdfIn PDF document text
    • https://futurefacesnyc.com/uploads/file/16814358414.pdfIn PDF document text
    • https://taucaotoccatba.vn/images/news/files/58892794705.pdfIn PDF document text
    • https://simon-daulte.com/ckfinder/userfiles/files/fazajibirij.pdfIn PDF document text
    • https://rowsontw.com/shopadmin/upload/files/leful.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c4a50690a0---nobexelotewukubi.pdfIn PDF document text
    • http://akiyastyle.com/app/webroot/js/ckfinder/userfiles/files/81241479057.pdfIn PDF document text
    • http://alda.pl/ckfinder/userfiles/files/duvolimudesugiv.pdfIn PDF document text
    • https://am-system.eu/ckfinder/userfiles/files/45384966949.pdfIn PDF document text
    • http://awarelaxcentrum.cz/user_files/file/selenuveporuwed.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=how+do+i+password+protect+my+phonePDF 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_off0000e5d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D2 17924 bytes
SHA-256: 3f326018329e5c4e6346ee0c0c617b5b3bfa7c914af8f1c6d723f33bc027d772
font_01_sfnt_off00011413.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11413 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C2A 10924 bytes
SHA-256: 1072994fb46c7e099d3de67759fc6e84f7fdc9176ae1ebbd52a98501ad3f69c8

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