Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f3e359bb5fa9ab0…

MALICIOUS

PDF

83.0 KB Created: 2021-07-07 08:37:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b89e0fad58126291fd39e57d070f9124 SHA-1: 5bb1733eb463c9ba57b44e22e710c3a6364e207b SHA-256: 9f3e359bb5fa9ab0f7544ba922978b854d6d0cbdf580fb1a62db2be148af88fd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics as a link farm, with many URLs pointing to compromised WordPress sites. The ML classifier and ClamAV also identified it as malicious. The presence of numerous unknown URLs suggests an attempt to redirect users to potentially harmful content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/8f3c57ea397100d0342c1af97f1bc208/koridiwiditefad.pdf
    • http://eaas-journal.org/survey/userfiles/files/zekedikevafalokawiraf.pdf
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5cd4c35e1c---fanibegikuradojakodo.pdf
    • https://aartipalette.com/userfiles/file/jepiratexipinukuvadarij.pdf
    • http://s8radziejowice-paszkow.pl/userfiles/file/86092267650.pdf
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/14b682346169853a689fa2ae9e0db784/xokasajad.pdf
    • https://marljivo.hr/userfiles/file/56939543871.pdf
    • http://auxerretv.com/content/public/file/mixotowix.pdf
    • https://steklo-shik.ru/userfiles/file/gavuluvu.pdf
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/67503958733.pdf
    • http://zwickerfoto.hu/_user/file/nenowekirebalaxafigira.pdf
    • http://thongthien.vn/upload/files/27237603173.pdf
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160819fcd1c264---49792107980.pdf
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608621b765006---54645607450.pdf
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160abd5aa8db38---mejili.pdf
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2f680ec7d9---86720054133.pdf
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/ea749b51da5c99b658eaf19bf24714d9/wutixano.pdf
    • https://nidi.mk/ckfinder/userfiles/files/zujuzamofisik.pdf
    • http://softwarefactory.nl/images/file/joxafesevosetuben.pdf
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a0137ea891b---74818863820.pdf
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/5caa8631d47d684ce6bfadea65526bd5/97236436056.pdf
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1606f377c09470---gafuvewodis.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=muddy+water+blues+song
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2b6.bin
93638bb82dc07d477e3f957d064f4dbb4d2d927399d395aa146d8cef46f621bf
pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B6 16880 bytes
font_01_sfnt_off00010e24.bin
35584a58e90218c283e38c3b6ae687312183f35e9277066cb0a0121452fc53df
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E24 10764 bytes
font_02_sfnt_off000126f1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x126F1 16792 bytes