Malicious PDF — malware analysis report

Static analysis result for SHA-256 35bd74d73f07d98f…

MALICIOUS

PDF

91.5 KB Created: 2021-06-25 18:48:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ad5fba30c014830ce22016ba93faae30 SHA-1: b9fb9df82133f72e5c33b1aa4c82f6b44b48d5d5 SHA-256: 35bd74d73f07d98f52cc7a4a449a4bda58a84b21b932d8d4714e5070c2d8bb19
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to compromised CMS upload storage, indicating a link farm. The ML classifier also flagged this PDF as malicious. The primary purpose appears to be redirecting users to potentially malicious or SEO-abused websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9746

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://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/079871d1050b030d0bd072f5a88b7403/pepapodomapofajeso.pdf
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/mi1hffel7kfmcsipsqo583e9tm/36683149832.pdf
    • https://paklya.su/design/img/upload/file/nedujenev.pdf
    • https://aspaeng.com/files/image/files/19302654761.pdf
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4adfb38076---93045181268.pdf
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160706a58ad0a5---pinurusamonovomokowin.pdf
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/5f5a9fa6ab8689fc5a72b819453f43d0/vijuvir.pdf
    • https://autotrans911.com/thread/admin/uploads/file/dugidufowa.pdf
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1f7067675---bisasovo.pdf
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160c3b45f6ae59---dimox.pdf
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/a9981a81c4f6f60ee778702d8c52ac33/pekixaparoginotojuxe.pdf
    • http://quickvideo.nl/userfiles/file/buronireginidivutedetu.pdf
    • http://nowyhotelik.pl/userfiles/file/lowuk.pdf
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/0c99200229b92cd1c70fb6cdb877549b/vixowatawasurimijimemuxa.pdf
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c4b036f3619---29291146937.pdf
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a1067b2ceb2---kowobiveseneta.pdf
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/766qdu9gel01v2q77o5abo9ib4/99357591549.pdf
    • http://hasici-pristroje-eshop.cz/files/file/gejaza.pdf
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160a0ff87af87a---fojawitiwuseduf.pdf
    • https://xn--mgbaf4adbs1bd2i.net/upload/ckfinder/files/bofapabuwi.pdf
    • http://dajuicebarus.com/uploads/files/22696535837.pdf
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160829f5286c4d---zufida.pdf
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a443dcf2e97---tesugutesavafepox.pdf
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/50ijklmofaoqfl2m722gqbpu51/7070065824.pdf
    • https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/c0a7b333a1b25d9d602c8aea7f67ac63/nejirijidufubax.pdf
    • https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/e344391d9006fd115eebb6998cee5592/guvavijeduxexomawabutul.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=years+i+spent+in+vanity+and+pride
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f4f10307f5---xowaxajexewobifutal.pdf
    • 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_off0000e92a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE92A 16792 bytes
font_01_sfnt_off0001013b.bin
27fa49ca30b1f57c6e4f8b99ad1f73ead7010ce1f191e20d716503af09158f46		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1013B 16160 bytes
font_02_sfnt_off000116b0.bin
4d6becaaaae90d50ec862f2d59ee6131c51c47b4a8fe2871d15bc50d3c875924		 pdf-font-stream PDF embedded font (sfnt) at offset 0x116B0 19172 bytes
font_03_sfnt_off0001482f.bin
5850fe23cffbf036dcb3ab61456834ca6689e4386af6ddae33e66913c50e7c7d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1482F 10384 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.