Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed2b9eb3ca77cb81…

MALICIOUS

PDF

89.3 KB Created: 2021-09-05 00:33:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5a3b1388c1348d7d31982cd11a7052a1 SHA-1: 3bf89f1c4704dcb321140171284dd79c19a2a209 SHA-256: ed2b9eb3ca77cb81b35aa001acf085795153d1f8fbf6268c117cc5745ab90e6e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised websites, many of which are hosted on WordPress installations. The presence of external URIs and link farm heuristics suggests the PDF is designed to redirect users to potentially malicious content, such as phishing pages or malware download sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ketchas.ru/uplcv?utm_term=advances+in+financial+machine+learning+pdf+github PDF link annotation
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/16123c931b5c17---bowusasozurito.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/b092554d1108a73c708bfcd45dfc5678/jasuzetowaruvovemoteris.pdfIn PDF document text
    • http://liavanhaeringen.nl/userfiles/files/40973162463.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/nobolafudadil.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160c0318b4c8a6---52626863902.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//44205426371.pdfIn PDF document text
    • https://hospvetcentral.pt/site/upload/file/dejadif.pdfIn PDF document text
    • http://hzosm.com/images/upload/File/55072709897.pdfIn PDF document text
    • http://adria-ex.com/images/blog//file/dimusudu.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//81721560228.pdfIn PDF document text
    • http://ausafe.net/images/art/files/jirowubimugo.pdfIn PDF document text
    • http://misosmile.com/upload/editor/files/7182713833.pdfIn PDF document text
    • http://sheeld.org/clients/d/d0/d021426cee8527c21a172be12ef3d645/File/9781723270.pdfIn PDF document text
    • http://diysmart.net/userfiles/file/witodew.pdfIn PDF document text
    • http://prvugkh.ru/uploads/files/80092355515.pdfIn PDF document text
    • http://bigsvatcharasith.com/userfiles/file/nepefuxaj.pdfIn PDF document text
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/05ab8ea9bea65794974164d277ae0959/feludelukeledali.pdfIn PDF document text
    • https://nutricount.cz/UserFiles/File/dozofezu.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/9995cbc0019a5dff98ad2d0d2e955030/67414607936.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/58ong5gte5fubkv67bi4uvdmm0/deranez.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/03jgpt526jvjlbdkbeelvrejo5/88966072109.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/87400409282.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/k3lj71aa5l2efuurrlm0ubnegi/83550840209.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc246f19f2d---97153232826.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c1d61b25eb1---1747714365.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_off0000eedf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEDF 20544 bytes
SHA-256: 0341f81e648bce29e7a81c820c8c37fb9c4815b651c42f971b032bcf57f6adaa
font_01_sfnt_off000124eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124EB 11232 bytes
SHA-256: 5a148dfb3b270f553733060303b51400b61dffb37b3baeb1d52b09c1e4a82bb1
font_02_sfnt_off00013eaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EAA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.