Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2cae8f0ef69cbbd…

MALICIOUS

PDF

74.0 KB Created: 2021-09-08 04:56:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1d9c4e177b0cb500d3c399c4f24f679f SHA-1: d192a5c45454125a5d41990f9c75caf2decffd87 SHA-256: a2cae8f0ef69cbbd85530a7d1713c37688577be81a2dd1527eab9045a2a03299
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting. The ML classifier strongly indicated maliciousness, and the heuristic firings suggest this PDF is part of a link farm designed to redirect users. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://allytemp.ru/uplcv?utm_term=home+guardian+security+system+manual PDF link annotation
    • http://lawngo.net/fckfiles/vuniresikagukidoko.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16094e3133c55a---japuxurekevuda.pdfIn PDF document text
    • http://kiko168.com/UploadFile/file/20210904124758872.pdfIn PDF document text
    • https://cincia.ro/ckfinder/userfiles/files/wakefagikimirozibo.pdfIn PDF document text
    • https://biodez.lt/i/File/zefolimapofuz.pdfIn PDF document text
    • http://abwingsbuffalo.com/uploads/files/60515807136.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160db193ca890e---59237095555.pdfIn PDF document text
    • http://orderbestwings.com/uploads/files/pimipadunukosogebevud.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160845a7a38071---mirefumekewemusizaveram.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/02ebc7a0fafd01119e2088903b59a0dc/11218882419.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/e23b262ac01097f6144ba6a5cbc948e3/67770480969.pdfIn PDF document text
    • http://jr-bang.com/uploadfiles/20210627084836.pdfIn PDF document text
    • http://vencedor.coop/images/admin/file/wufituzituna.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c06e3149f6---44374029181.pdfIn PDF document text
    • http://nemalipics.com/85328921047.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/f0f44b7a9f3b7f54fcfba78f158f966b/naxuzodazebomebulokes.pdfIn PDF document text
    • http://thesnowmanicecream.com/ckfinder/userfiles/files/70387888250.pdfIn PDF document text
    • http://currycornersugarland.com/admin/images/file/xodasetimur.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/81f9277b61718f0b1efe1b5ae45ce902/munokopulewolemakurikekuf.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1607c7c5a129b3---koponiwo.pdfIn PDF document text
    • http://samtle.net/ckupload/files/renekuvokawutogido.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609422ebe5455---66837782452.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_off0000bcea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCEA 10920 bytes
SHA-256: aaaa6635053b39983739c4c159eb8ffc540bb54ad12652c816900320c399a0fb
font_01_sfnt_off0000d5f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5F8 17344 bytes
SHA-256: a896c9fb910cb5af6e367b7f878c5e7ff1c1f05a387903edbb7e151022b2124f
font_02_sfnt_off00010290.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10290 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1