Malicious PDF — malware analysis report

Static analysis result for SHA-256 87d7727930f3f3e2…

MALICIOUS

PDF

84.5 KB Created: 2021-06-29 03:03:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 09a885b83717f2d1e3d1f2883bb1cb54 SHA-1: 731597384af5d57ba5ebd89cc61ec3c0a60b1dbe SHA-256: 87d7727930f3f3e2d8457cf49e706d4930f7c5d24a069845cd4d6ae7ba8e8531
96 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to compromised WordPress sites and disposable hosting. The ML classifier strongly indicates maliciousness. The primary function appears to be redirecting users to potentially malicious content hosted on these compromised or disposable domains, likely as part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/oamg9pen8hurc3ve6hki3m3mi0/rufetefakejezebo.pdf
    • http://nfc.soo.jp/file/tujitafasapulitajavilopif.pdf
    • http://ajarnveerapong.com/UserFiles/file/nuxidowepu.pdf
    • https://mut-zur-veraenderung-hambuch.de/userfiles/file/81784778170.pdf
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160ad33cf5067d---19230226299.pdf
    • http://phuwangnam.com/user_file/file/52669005872.pdf
    • http://stevis.cz/files/file/gadunovilekinijoka.pdf
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da4a652a769---tavapofofiwapuzikanixaduk.pdf
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/1147c210528bd01fb9759ff228d1406f/vitoxetesexulotobibineder.pdf
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/1d8959835298e043b27e0300f0ebf7ff/zavuzoxobamikoj.pdf
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608369fbba32c---92925140991.pdf
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609985e5d69e1---fagupewewowuj.pdf
    • http://szakkepzosiklos.hu/upload/file/timutosokejazenasumobuk.pdf
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/76cc71b5703c11e763a21532bdcbaa90/nikujore.pdf
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075d58fda3a9---71354195180.pdf
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/e09lo2hjkbug02u1ha73l6in6b/torapenasagawajoguxubivi.pdf
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/k8huga6qt71qhf4fdf6mpo6u78/96877161203.pdf
    • http://teaandtiarasottawa.org/clients/e/e8/e8f54e69a7463df9fd0adff13cd8e90f/File/83120755911.pdf
    • http://chandigarhdatarecovery.com/files/file/35811039561.pdf
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160788660eaf68---37085255408.pdf
    • http://come2menorca.com/images/file/nagadujufajazunedin.pdf
    • https://advance-pack.com/editor_upload/file/76596250110.pdf
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/a9143079ae133df674dc8dd3f810b6da/42110691793.pdf
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/16073ee2456868---misoporosuxekisoti.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=rice+and+onion+water+for+hair+growth
    • 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_off0000e8d3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D3 16792 bytes
font_01_sfnt_off000100ea.bin
4ba5c9d784aec09ec81fcb99cc29f4462a80a52a8c8e9f5e03b7d817ef2f130a
pdf-font-stream PDF embedded font (sfnt) at offset 0x100EA 10672 bytes
font_02_sfnt_off0001192d.bin
ac62b53a99780bbc9447b4fb0fd53cc46647fa14fa8b970745e3960f56fa037f
pdf-font-stream PDF embedded font (sfnt) at offset 0x1192D 16796 bytes