Malicious PDF — malware analysis report

Static analysis result for SHA-256 5718c5f70bf48248…

MALICIOUS

PDF

91.1 KB Created: 2021-07-01 00:18:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4aecdedcc561da777bc4512833fcb3e9 SHA-1: fd9762f620e8229e2479660615bd633a31165eae SHA-256: 5718c5f70bf48248fb62f489272c54e9c9404d82b9c5ab9ba1add11105128ec7
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many pointing to compromised WordPress sites, suggesting it's part of a link farm or SEO poisoning campaign. The ML classifier strongly indicates maliciousness. While no scripts were extracted, the structure and numerous external links are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://wastran.ru/uplcv?utm_term=beauty+is+only+in+the+eye+of+the+beholder
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/bdf7be51e9d2967fb72e18c9cf01d427/42057193141.pdf
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcef2db7eb4---letolobigokapufeketija.pdf
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3a9ca89665---49355463405.pdf
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/b9f9b5d20a974fd45d2f7c27584c6f0c/xeturanixonakirinazuroju.pdf
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083a240e7b56---widosuse.pdf
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4d5bcb5cbe---lepolufexoxi.pdf
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/2gorrdodubgi9h39ntl9fa57j1/janesepexisoduzam.pdf
    • https://carsen.sk/editor_uploads/system/files/sunoludizub.pdf
    • http://ptairsupply.com/userfiles/file/13549395375.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608d9cd8c7798---gabuxagozugezeru.pdf
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16098bb51d2b9b---fojigurena.pdf
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/c7cddab1993912784fee015a9ddd919b/zewezunesixomal.pdf
    • http://cityhelps.org/clients/6/61/61afa7a028a8e04f14432b0fece6f2b0/File/gixidotewozademejasekuw.pdf
    • http://baaningdoi.com/file_media/file_image/file/govalidadojusi.pdf
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/ueik73slmt2fkdqn0raovqso8j/49165919389.pdf
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/bf8826a0a8b1a83ce0bed4159a1bb6e6/gatesojamivavoxukabi.pdf
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac514bb2384---kakobapesevupikarisu.pdf
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609e257999c75---33960162659.pdf
    • http://n2nlah.org/UserFiles/file/93208273818.pdf
    • http://allasclub.com/campannas/file/84500194066.pdf
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/fabb0da813caf41dcb80363f39323b00/74586692331.pdf
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c583dacb6bd---lanevuladanegujapu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f676.bin
f368f6d9ec9a2f56223ccb894bf0cb113d392248b9577d0c38c1e63812a0ccea
pdf-font-stream PDF embedded font (sfnt) at offset 0xF676 22004 bytes
font_01_sfnt_off00012e0f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12E0F 16792 bytes
font_02_sfnt_off00014626.bin
c17882f8d1b78beb3d49690b13dfd3ec8242f570150501db3b511b8e33f6c21c
pdf-font-stream PDF embedded font (sfnt) at offset 0x14626 10860 bytes