Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff248cd83afef72a…

MALICIOUS

PDF

98.9 KB Created: 2021-06-27 22:13:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1cb7a89bde4f07e6d58176e9e52ed692 SHA-1: af9cdae54c2fac24fb48bf613442e8cfa1704677 SHA-256: ff248cd83afef72a00d462dd55dbba05f86ea30329a509e519d59ab1e85ec2ef
96 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites hosting other PDF files. The ML classifier strongly indicated maliciousness, and the link farm structure suggests an attempt to manipulate search engine results or distribute further malware. No scripts were extracted, limiting the analysis of direct execution capabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9885

Heuristics 5

  • 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://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/032ca62596085ac8ab94974114574353/gabanogezejutiteni.pdf
    • http://yasaitogo.com/uploads/files/diwefurubekenoregafewagur.pdf
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/s83ud85dqbtfeqkfk5701816t3/17703892147.pdf
    • http://lamekatus.ee/uploads/ckeditor/files/gowowinabikulil.pdf
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/crtebnc2pt67mbb5s75i6i00d1/wifiji.pdf
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084a767a9825---57371440082.pdf
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160899cd92170b---midiwo.pdf
    • https://nikosdimos.gr/userfiles/file/suzuluvozilonigezab.pdf
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fa5bdad0a0---pijog.pdf
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b456675a18---82391109415.pdf
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/icd53jnu1drtp4hveev05mpiu3/46215856950.pdf
    • http://atonoserver.com/userfiles/file/59337618139.pdf
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b7f08d6dc9e---2864405251.pdf
    • http://brooklinehs1964.com/clients/6/6a/6a3559cec3eb17f551da2d864c8c85ab/File/sidoxazutujipisoboxesemuk.pdf
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a97b7a8a197---nizijuwoweso.pdf
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa6e7595e9---41999147797.pdf
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160753f1f353ac---likob.pdf
    • http://antifftech.com/uploadfile/file///2021051418541541.pdf
    • https://abicecream.ru/ckfinder/userfiles/files/jarugakenemar.pdf
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b1610e1a030---rerawopizefiketem.pdf
    • http://france-ex.com/images/blog//file/solemisiwadob.pdf
    • http://ahcxdq.com/uploads/file/300649595045.pdf
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c00ca02ab7e---54137794892.pdf
    • http://fitviewer.biz/files/file/54158456366.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=mods+for+stalker+shadow+of+chernobyl
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000107ba.bin
e13d526aa8fe8486b3434a119e23ebeb32a03585d288368a37ec1e9d9c6ce1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x107BA 17920 bytes
font_01_sfnt_off000136d9.bin
22b243d99989251ea34db300358bce4ffc7772a26a6b079f56059d026104e3e4
pdf-font-stream PDF embedded font (sfnt) at offset 0x136D9 10904 bytes
font_02_sfnt_off00015023.bin
fd494554c7a7a2c4488382a78096c535ff133766c7221992be4f6a58596b2467
pdf-font-stream PDF embedded font (sfnt) at offset 0x15023 16164 bytes
font_03_sfnt_off00016599.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x16599 16792 bytes