Malicious PDF — malware analysis report

Static analysis result for SHA-256 78a39d64764ae0eb…

MALICIOUS

PDF

93.0 KB Created: 2021-08-09 08:43:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 9f8dba4efd21d61a961550827943ee2e SHA-1: 8ab614deb030442bb3999c64d90d5ab5d7f32452 SHA-256: 78a39d64764ae0eb4cc859e83540f6e0e29add4e62e3227f7a546d33855931f7
196 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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://ildungrice.com/fileupload/fckeditor/file/vinezagi.pdf In PDF document text
    • http://chapraptti.org/userfiles/file/73522229083.pdfIn PDF document text
    • http://jump360.co/upload/files/20210715143309.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/16084eb25e543b---30997498288.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160d081e51de32---39840894966.pdfIn PDF document text
    • http://suachuadienlanhhoaphat.com/hinhanh_fckeditor/file/bitekeb.pdfIn PDF document text
    • http://veraschwemmle.de/fckdata/file/44905758519.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/hcbm1gqictqa80l0oftv930gb2/42945467441.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d11f8c553---zadad.pdfIn PDF document text
    • http://au-zlato.sk/upload/files/79811406329.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/09a9b360a22cd866c26459bc0ad53e0a/fekipexazeg.pdfIn PDF document text
    • http://geodavidepini.it/userfiles/files/71573524833.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b0d8bf325e---lemopifatij.pdfIn PDF document text
    • http://hvezda-pardubice.cz/files/file/ribalironafezamonukaj.pdfIn PDF document text
    • http://okudshava.ru/userfiles/file/sisitetoralafuxemamazamob.pdfIn PDF document text
    • http://ativn.com/upload/file/pupaxagenefikeb.pdfIn PDF document text
    • http://clinicaveterinariamontecchia.com/userfiles/files/29517647758.pdfIn PDF document text
    • http://asupuro.com/user_data/image//file/koraruro.pdfIn PDF document text
    • http://elijasprojekts.lv/files/file/7313260627.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1608f4bd838c08---futaropemetaxubogibov.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/39970bef5812b14483ef6809fe826a64/bakozinokidelovoveduk.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/16fd09867753105593282b51688dda86/foguf.pdfIn PDF document text
    • https://luatsubienhoa.com/upload/ck/files/62001663389.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16086ab5f2871b---kimepezudigaz.pdfIn PDF document text
    • https://triangle-electronics.com/assets/userfiles/file/20275427964.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=t+mobile+online+sign+upPDF 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_off000104c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011cdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CDB 10440 bytes
SHA-256: 3c07eb2822c03ee6650ba511a5ddfb25eb39efb708652fd8bdf399386ba89f5d
font_02_sfnt_off00013432.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13432 18928 bytes
SHA-256: 1f05b3fb36cc83f34e6be567cb3da05a112494c2d69b2d9be2ecd4ca20cd6c22