Malicious PDF — malware analysis report

Static analysis result for SHA-256 9556c9bd3f6b3731…

MALICIOUS

PDF

73.8 KB Created: 2021-09-03 15:18:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 0abf3415e85f0a43f5cb5a1b15c20c21 SHA-1: fb24708b807a61b4c923144aa7379730b7cbc0da SHA-256: 9556c9bd3f6b37319ee8ef9dbed64ad7af7a6ceed749fc5f8bd17855919355f1
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier strongly flagged this PDF as malicious, and the presence of multiple external URIs supports a phishing or malware distribution attack pattern. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://pixomot.ru/uplcv?utm_term=yeoman+devon+stove+manual PDF link annotation
    • https://laetitiabernard.fr/images/file/zutuvutebawa.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613116b106a60---gomabebitafe.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/e4j28a6k3945hngsh4q5p6oiue/lazukoxin.pdfIn PDF document text
    • https://transilvaniafishing.ro/app/webroot/files/userfiles/files/rebulebejivajumev.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/h6nn3di5konnlm5vb9ib35o70a/junorigapor.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/113df42cf7209b615f4c2df0ec6d0c13/zipijelove.pdfIn PDF document text
    • https://zzhqhi.com/d/files/genulavabop.pdfIn PDF document text
    • http://stepsforstarlight.org/clients/c/c6/c668404594a1c08d975ab50c7bec58f6/File/xawifobituluxofelugozedip.pdfIn PDF document text
    • http://xn--12cmi2byac9cdhd0hra6d7bxkwbgj1gch.com/user_img/files/25376007433.pdfIn PDF document text
    • http://www.logomarcanet.com/userfiles/file/94868304994.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/66663271588.pdfIn PDF document text
    • https://gulfsupremesa.com/ckfinder/userfiles/files/70123106931.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/87346606536.pdfIn PDF document text
    • http://westleyden72reunion.com/clients/4/46/469dc9162705cbff2d1fbe132f144f37/File/xesepubedesiketavatanit.pdfIn PDF document text
    • http://laptopcuhaiphong.vn/upload/files/zagofizemigas.pdfIn PDF document text
    • http://inhome360.ru/admin/ckfinder/userfiles/files/70137409780.pdfIn PDF document text
    • http://nessium.net/userfiles/file/21667518144.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/acqbc8rqlugdk806t7j1dbf0d8/fokebidig.pdfIn PDF document text
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/9577d6eff0fc692023949bc35a85551b/42578257622.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b86bcaede2c---34743968208.pdfIn PDF document text
    • http://euredit-editions.com/userfiles/file/68483163271.pdfIn PDF document text
    • https://dp-silver.com/userfiles/file/13885682158.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/46475807172.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074991262003---kuzibafevawan.pdfIn PDF document text
    • http://airholic.com/UpFiles/WebEditorFiles/file/xuwagamefefovuvoruwud.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b64fa7947e8---10658175627.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_off0000bcee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d505.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD505 10368 bytes
SHA-256: 6193861acb7b1d451bc78e40e849d712c06cb3fc8acdd32f3057c7ba5e9f92b5
font_02_sfnt_off0000ec79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC79 16928 bytes
SHA-256: 3b46b2d0dd4c49045e587b90832edef09b67cda1f1c9718f9894546e96fbdb01