Malicious PDF — malware analysis report

Static analysis result for SHA-256 45ce9aa1d06b62a9…

MALICIOUS

PDF

69.7 KB Created: 2021-09-06 12:58:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b18192ff602fc619659e8f8c5fa9a676 SHA-1: 3e468c70545952f9f304c41a9070fd71c5513612 SHA-256: 45ce9aa1d06b62a91910184433acf7146b407d39c732462be231ac1970dac609
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 links, many pointing to compromised CMS upload directories, suggesting it's designed to redirect users to malicious content. The ML classifier strongly indicated maliciousness, and the link farm behavior aligns with phishing or malware distribution tactics. No scripts were extracted, and the document body was unreadable, limiting further analysis of specific payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099b5ec94a41---kiver.pdf In PDF document text
    • https://cissud.it/uploads/ck_editor/files/15118691196.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/5999d72d49caa9adbf7cc2d54587391f/40015386026.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/b1f957acc99ef6a2ac6eacfdc9555ee9/20449588024.pdfIn PDF document text
    • https://dgaspcsm.ro/ckfinder/userfiles/files/37888517553.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608732bcf0ae5---96479846218.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/g82d8nbecnqasu9d1208md9sm3/dilekuwi.pdfIn PDF document text
    • http://studiotecnicodama.it/userfiles/files/40895683590.pdfIn PDF document text
    • http://vankouwenenmastop.nl/UserFiles/file/58387686158.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021062905311314.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fcf670a1234---88346248494.pdfIn PDF document text
    • https://airbays.com/userfiles/file/72100804406.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/letarewajigigu.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160a0cf30841d0---41349606555.pdfIn PDF document text
    • https://nezamirekhaseafoods.com/userfiles/file/95258723496.pdfIn PDF document text
    • https://atl-50.com/files/file/86763174722.pdfIn PDF document text
    • http://huyndaicaudien.com/upload/files/salovamijefijidemedoxi.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160add70a1d08f---30104627172.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b1bba0a8042---mujizupav.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b28c9578f8a---49552379689.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e75773f141---75087163758.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=narivad+in+gujarati+sahitya+pdfPDF 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_off0000ae88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE88 15728 bytes
SHA-256: c8f4316cbf1eb9556c6e9e729bd2b1d2781e62cf12efbd9833b9441a70320ed1
font_01_sfnt_off0000d726.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD726 10868 bytes
SHA-256: e8d77b13d1a7df261a760bed10c81944a131c58923fa2aaca5fc8de3326e6909
font_02_sfnt_off0000eff3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1