Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bfebca60bb09462…

MALICIOUS

PDF

76.9 KB Created: 2021-08-11 13:15:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b8a749980e2b9943758111efd64717f6 SHA-1: 3a798674b747b39111f7bb93b051bd08b84baa19 SHA-256: 2bfebca60bb094625842eb8515a7bf1aee34f93317d33f4e39d88c606425732b
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links, many pointing to potentially compromised WordPress sites, which likely serve as a link farm to distribute further malicious content. No scripts were extracted, but the structure and URL patterns suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160712d231bfdd---nibipabokedifimamadaxab.pdf In PDF document text
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/9a4f07faf6cd7f55f80b046a92fc40ce/82104696121.pdfIn PDF document text
    • http://daoltrading.com/userData/board/file/mefipifokugop.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/5c24c5fe03e1b35e29a9eb78a96bcc61/bevifovofanulizajodaj.pdfIn PDF document text
    • https://toptenstudy.com/upload/files/BodyFile__60DE1613980D9.pdfIn PDF document text
    • https://renfrewareahealthvillage.ca/ckfinder/userfiles/files/danawevugowekewirubusebo.pdfIn PDF document text
    • http://mytmbc.org/fckimage/file/bifofopadebom.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/f48e4af3d81dddf6688ddd7a6d861677/sovukojupupebu.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609c37ac1656e---44094412675.pdfIn PDF document text
    • https://petala.gr/userfiles/file/pagodaremenamapotimododos.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607f065331e60---38355636131.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/b25ae1f8f5efc58c059c095c2acd0fa0/84749344964.pdfIn PDF document text
    • http://www.companyforte.com/imagenes/editor/file/50032705413.pdfIn PDF document text
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608838d69d067---49934019145.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160929e72973a8---kafikeviwaz.pdfIn PDF document text
    • http://secureyun.cn/uploadfile/file///2021072922181013.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/semitem.pdfIn PDF document text
    • http://haileylusk.com/clients/e/e6/e6412a3df854040bfb282c4f37eddf02/File/54156760829.pdfIn PDF document text
    • https://brahmagnanam.org/fck_uploads/file/53202428844.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086e6985a56a---gatusejonigazexotojatut.pdfIn PDF document text
    • http://gaushalango.com/uploaded_files/userfiles/files/20450185776.pdfIn PDF document text
    • http://skoleniridicubrno.cz/ckfinder/userfiles/files/mazojanevolabupesadesij.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/5591c46b122fe663445ab5903a2c972d/49470382851.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=super+mario+odyssey+prima+collector%27s+edition+guide+pdfPDF 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_off0000c7ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7ED 16548 bytes
SHA-256: 7697c1380f4590739d297f06023188c01d339d2ca03ec01179f13f4a431ca15f
font_01_sfnt_off0000f2d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D1 11284 bytes
SHA-256: 496983e32de9669e48576a97edf7947e48cfcbbd8a21e8db57b84d41905222e5
font_02_sfnt_off00010d2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D2A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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