Malicious PDF — malware analysis report

Static analysis result for SHA-256 6695acd3de325754…

MALICIOUS

PDF

94.8 KB Created: 2021-09-05 04:52:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1c7d54674c7cf22f6de80c99ae9e9d6d SHA-1: 78adbe3ed84e5987fd6955d1ac1ea4ddf6c1017f SHA-256: 6695acd3de325754213e175693fe757d9d40084c75c261cb74e149f6322c9c28
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 CMS uploads and disposable hosting, suggesting a link farm for SEO manipulation or to distribute further malicious content. The ML classifier strongly indicated maliciousness, and the presence of external URIs and compromised CMS links supports this. No scripts were extracted, but the overall structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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 https://drafthe.ru/uplcv?utm_term=itinerario+roma+2+giorni+pdf PDF link annotation
    • http://vodnik48.ru/content/file/werizejokojezukapanesoji.pdfIn PDF document text
    • http://balade-pierry.fr/userfiles/file/86882624787.pdfIn PDF document text
    • http://townofwinslowin.com/flash/townofwinslowin.com/file/duwodotanodadora.pdfIn PDF document text
    • http://phuocthuan.vn/images/pic/file/69684720178.pdfIn PDF document text
    • https://bistakalikotenetwork.com/userfiles/file/mudosewunagemot.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/po8jf8sqogsk58nsrglmo1io8g/pusevudoro.pdfIn PDF document text
    • http://bayzones.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/75145673784.pdfIn PDF document text
    • https://mastirz.com/userfiles/files/12073584688.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/rjp2v7nn2169qkr3janjot0lq6/28183486228.pdfIn PDF document text
    • http://tlumacz-bialystok.pl/pliki/file/babogawuxizilogagumapawo.pdfIn PDF document text
    • https://etre-cheval.fr/Applications/MAMP/htdocs/etre%20cheval/news_pix/file/tofetalezedek.pdfIn PDF document text
    • http://megalabsrl.it/userfiles/files/93429078574.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612e185315789---ritigepegefazagisenavepax.pdfIn PDF document text
    • http://montagnobozzone.it/userfiles/files/lepefonowiza.pdfIn PDF document text
    • http://bigredclassof1960.com/clients/879476/File/puzoxetorupitanize.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/ca7721f74aff174c1e16bd5e8959dc8e/lonazofi.pdfIn PDF document text
    • https://vieclamxaydung24h.com/upload/files/97170579272.pdfIn PDF document text
    • http://ndt-tl.ru/upload/file/makebefidubezemagoxibi.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606faea8c10f6---54585958313.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609495d7af36f---58685378282.pdfIn PDF document text
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c248ecd6cc---67955360277.pdfIn PDF document text
    • http://hainescentreasia.com/images/file/nemomaxukusemizox.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/35d3d3a8b7675434307aff802053cde3/gupebelafeb.pdfIn PDF document text
    • 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_off00010e5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E5C 17800 bytes
SHA-256: 7eb28c8caebf25e49c1d0ed1a906961b4c9cbcf2b8025123c40d085935c6dca0
font_01_sfnt_off00013ce4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CE4 10700 bytes
SHA-256: 13d657c86373661b32905694dd963e3b5aec3456b05ea75fe07f9db837173a9b
font_02_sfnt_off00015543.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15543 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1