Malicious PDF — malware analysis report

Static analysis result for SHA-256 7244dc82de70cfed…

MALICIOUS

PDF

89.4 KB Created: 2021-06-30 23:13:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 445ba5173201d3adfaf62ac49eeb85f3 SHA-1: 2cc31fec3727698f3972c378e3f559b85bcf1cbf SHA-256: 7244dc82de70cfed3041ff40aabf816cfff94d7e98381cc80d2676703acd6dd5
156 Risk Score

Malware Insights

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

The PDF document contains a large number of links, many of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. The document's structure and numerous external links suggest it's designed to lure users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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 http://alt-1c.ru/userfiles/file/nasex.pdf In PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160955fffda8e4---78223646402.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607c4ad15e2b4---tipefesiviju.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/8d9027cbe60d28285038f5dbe61e8d6d/mimuro.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/81da4a082c93c8f63156b87ea66df310/biwowitimuzalefano.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16080adda80404---80972521978.pdfIn PDF document text
    • https://bosgo.mn/uploads/files/98086829444.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/8d99ddfb7720f7bf72e3632219b8b153/zamorex.pdfIn PDF document text
    • https://detectiveoffice.net/userfiles/file/jifadibumofexudokixanovun.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a6843c3a89b---tetotive.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/de3a2dfc9c3bcd57811186ee50d3c0e7/ragixolerijubofumutofu.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/34f5c6bfb4ae6745d07ac0307d28de9c/47879918468.pdfIn PDF document text
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/1e2f3cc067a40cc1c646ab14b9f98a68/fuxalosovizetejon.pdfIn PDF document text
    • http://kinocosmik.ru/sadm_files/27264207807.pdfIn PDF document text
    • https://anandamsanyal.com/userfiles/file/tidozelujekuza.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c50510dc3b5---nofikidixafudizu.pdfIn PDF document text
    • http://astorandblack.net/emailer/userfiles/file/51329287102.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/mih96jlnr657aphetcmnelktji/34041300731.pdfIn PDF document text
    • https://dansobentre.net/uploads/file/faribuzofatapuridovaxu.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/ofg1t0itiur3ntfqqs6hc60i30/losofudadulazajinaroxewol.pdfIn PDF document text
    • http://www.scsi.coop/wp-content/plugins/super-forms/uploads/php/files/ffad405fcff28bb3878491c1f075c868/39717209847.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=sister+married+anniversary+wishesPDF 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_off0000fd4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD4B 16716 bytes
SHA-256: 154c8c90373bdc7a36f7d8d5b887b0016c3cdfd592c6f559e3906b4556d4d140
font_01_sfnt_off0001283e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1283E 10688 bytes
SHA-256: 32249ed8e0124bb2a91393718dcc89af43bc7d0ae3e6666195ff86c0efef05a0
font_02_sfnt_off0001409b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1409B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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