Malicious PDF — malware analysis report

Static analysis result for SHA-256 46f5f2206b948d0d…

MALICIOUS

PDF

81.7 KB Created: 2021-07-14 07:57:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: c4841937ff92214fa90dc84f9355c2a1 SHA-1: 84cf9361f6702f27482d943a940d9668d543a946 SHA-256: 46f5f2206b948d0db23511207afada98d4094716a754d0cea3695d8583e0bfdb
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised CMS upload locations, suggesting an attempt to host malicious content or redirect users. The ML classifier strongly indicated maliciousness, and the structure aligns with techniques used to distribute malware or phish for credentials. No scripts were extracted, limiting the analysis of direct execution vectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077931164899---64099177807.pdf In PDF document text
    • http://jjinline.org/file_upload/file/gogevitanebopimobigotod.pdfIn PDF document text
    • http://nousgarage.com/userfiles/file/wipupelafolimowo.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///1398107610.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/b7f765d007f8d09b122444b36a60873a/49457684997.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/kezudiniduleriwo.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/24db2f7a10f63455dc73253da56225b5/giwemupufowevidevex.pdfIn PDF document text
    • http://rebizplus.com/userfiles/file/zejaduxi.pdfIn PDF document text
    • http://decaldankinh.net/upload/files/44273915678.pdfIn PDF document text
    • http://lacyfamilyunity.com/clients/2/20/203fd950dafdada58ea32e7b96f0d147/File/mutagefilifemo.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/a853795c8353dc22897b8f187e30d056/15709722031.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608c5af0c4d94---dozesaze.pdfIn PDF document text
    • http://cachnhietcacham.vn/Images_upload/files/jexobekajege.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bd0e92be6ac---xewerisitukorovegumi.pdfIn PDF document text
    • http://travelport.pl/userfiles//file/79110942601.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609d879196003---busefewok.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/4c0ec5ce90cd0ea3be47561589bfd40a/79256698919.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/divimufex.pdfIn PDF document text
    • http://darienhigh69.com/clients/866565/File/15380901287.pdfIn PDF document text
    • http://naszymsladem.pl/upload/file/nalifexilib.pdfIn PDF document text
    • http://reneenicoleevents.com/clients/865995/File/24347852236.pdfIn PDF document text
    • http://fullx.net/files/80511983110.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/16085020c89129---refupo.pdfIn PDF document text
    • http://vtvxm.vn/userfiles/file/xutijudefufixegajexori.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=remittance+country+meaningPDF link annotation
    • 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_off0000d9a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9A9 18284 bytes
SHA-256: e703d2a68f02e1f870b8a1d2aeab4279f3a7bb75a22eb6f5807cfeaca9a06c08
font_01_sfnt_off00010916.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10916 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001212d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1212D 10616 bytes
SHA-256: 045ebd5c9e7a6bedb6536387f39ecb3a31081065ea6398909127d279e00d5d5c

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