Malicious PDF — malware analysis report

Static analysis result for SHA-256 4749b8445226322e…

MALICIOUS

PDF

79.7 KB Created: 2021-09-04 21:57:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9935abf7602617cba72f650624b0a0d6 SHA-1: e5009f538904f932782c3e6308d9143e4347f75b SHA-256: 4749b8445226322e295b5a6d56fbb374b6b933610e0b514a02d7a2c94a31699f
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160903696a3fb6---vagibasisogavefeji.pdf In PDF document text
    • http://atenngo.com/admin/sites/site/documents/gumijidapowivitipolexulax.pdfIn PDF document text
    • https://serini-cloud.pl/uploads/editor/file/79800968200.pdfIn PDF document text
    • https://mollis.rs//files/86053330298.pdfIn PDF document text
    • http://constantemails.com/userfiles/file/1626881840zukoro.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608035a0050af---fekonadorujilupedid.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/zemidefozevi.pdfIn PDF document text
    • http://starwindows.ie/ckfinder/userfiles/files/rabepapulujatulivan.pdfIn PDF document text
    • http://railwaysrailroads.com/upload_files/files/42262135996.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073bde95f3f5---93717075704.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c2a0f02d17e---51013171572.pdfIn PDF document text
    • http://shs67classreunion.com/clients/b/bf/bf9552935413f2527bbee995f2dfc9b5/File/36950109143.pdfIn PDF document text
    • http://fecoil.com/userfiles/file/mofurudofazulowe.pdfIn PDF document text
    • http://atallmed.com/userfiles/files/70468458883.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1606f71cb1e4e7---27450053267.pdfIn PDF document text
    • https://kenhquangcao.vn/uploads/files/fifegur.pdfIn PDF document text
    • http://creaorganization.com/depo/sayfaresim/file/jaxomojenuzuful.pdfIn PDF document text
    • https://dorfadvertising.com/ckfinder/userfiles/files/zedakenatidujazonog.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160984184e01b4---11350836077.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/f03ea46915cbe0db5f74d1c6c66b00ef/16393295229.pdfIn PDF document text
    • http://messtores.ca/fck_user_files/file/68165195378.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbccbecc86---8137544923.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160729e758974c---wunasekepilisova.pdfIn PDF document text
    • http://infinivideo.hu/sites/infinivideo/files/wefigiv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=current+affairs+2019+pdf+download+in+gujaratiPDF 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_off0000d087.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD087 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e89e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE89E 11480 bytes
SHA-256: 17f8995793faad19f881db65c21e95d3909d707d1fa4ab06d2ae870cb6d69df9
font_02_sfnt_off000103ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103CE 17312 bytes
SHA-256: d7d8e640373a59dc33775b69f7d4af513741120663c46414faceb870c70d3a94

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