Malicious PDF — malware analysis report

Static analysis result for SHA-256 59cf61131ab545bd…

MALICIOUS

PDF

69.0 KB Created: 2021-09-24 23:24:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a97e6a05e8e87d2597bfb1b0fecc6c91 SHA-1: 13d3cb7c313585238db6197ad7934f82a0edc25f SHA-256: 59cf61131ab545bde457b672ec5f25a228d887026a029526020ad1f6e8554f58
116 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF is identified as an image-only lure, typical of phishing campaigns, designed to trick users into clicking embedded links. These links lead to a farm of URLs hosted on compromised CMS uploads, suggesting a multi-stage attack. While no scripts were directly extracted, the structure and URL patterns indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

Heuristics 6

  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 2 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://sanaspinler.net/calisma2/files/uploads/45154689668.pdf
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146741a0b940---pawazof.pdf
    • http://ndt-tl.ru/upload/file/tupimipo.pdf
    • http://exoticland.bg/upload/files/files/fujubasuzazatemudu.pdf
    • http://bassbasement.org/userfiles/file/13487793774.pdf
    • https://12shio2.com/contents/files/pifetivoboliwebimo.pdf
    • http://langeline.com/ckeditor/upload/files/derisiva.pdf
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/b7k2ho1i0729f9v384bec2s811/47048776345.pdf
    • http://derp74.fooden.com/UserFiles/files/95923831217.pdf
    • http://ros-grad.ru/fck_editor_files/files/56211485576.pdf
    • http://kriosispl.com/cote_dor_import/admin/ckfinder/userfiles/files/20704986796.pdf
    • http://mega.kz/media/upload/files/venepozega.pdf
    • http://yigang-lin.com/uploads/files/202109200942408118.pdf
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614b1e80772f2---febigetirojik.pdf
    • http://zzfcw.com/file/fkimg/file/satas.pdf
    • http://semihkerpiccilervesupersound.com/upload/file/2063763653.pdf
    • http://ckpak.com/fckeditor/userfiles/file/xulurupok.pdf
    • http://mudrkanuch.sk/editor_uploads/system/files/vopatovole.pdf
    • https://grafconsulting.pl/Upload/file/70594710791.pdf
    • http://eatatrudy.com/uploads/files/velerizulefuvujukadux.pdf
    • https://madame-tina.com/ckfinder/userfiles/files/60317006211.pdf
    • http://tutek.eu/userfiles/file/gonurowelomo.pdf
    • http://neodentpetrosino.it/userfiles/files/95691180096.pdf
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144c1cb7680b---basujof.pdf
    • http://podiummoda.ru/userfiles/file/nizowumipuberid.pdf
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/lmdnslueu7j1n5grhbt7mad2e4/65162098566.pdf
    • http://babijie.com/upload_fck/file/2021-9-22/20210922144606871475.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=after+the+rain+watch+online
    • 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_off0000b266.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB266 16792 bytes
font_01_sfnt_off0000ca7d.bin
607a9b96c927204487f9783b25f43f4e5f52a735622dfd5c5bc2857a84967126
pdf-font-stream PDF embedded font (sfnt) at offset 0xCA7D 10332 bytes
font_02_sfnt_off0000e1ce.bin
909eab65536a89ad114bb431089ffb17dc2a860db58d8ebf00eef15fd53a66fb
pdf-font-stream PDF embedded font (sfnt) at offset 0xE1CE 14728 bytes