Malicious PDF — malware analysis report

Static analysis result for SHA-256 43fa0f0ce586b158…

MALICIOUS

PDF

94.0 KB Created: 2021-07-04 00:52:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5bad468073eb010014aafa43337a1117 SHA-1: 006d2e4cae62971a351cd98756b4c4901cf5fb91 SHA-256: 43fa0f0ce586b1589832c41f47f6303139a83ee31607e89fd35b5438344e3fed
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting, indicating a link farm or SEO poisoning attack. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the structure and heuristic firings suggest the document's primary purpose is to redirect users to potentially malicious or deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a3b0bb8d1d---nagafiki.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c67bb530c0f---rutetexagawev.pdfIn PDF document text
    • http://immodraft.nrw/images/architekten_agentur_images_/file/dujem.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/f872dc2a4ea28edb094646ca4c8bd4d4/rotuk.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/kidinibureb.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f9901b262c.pdfIn PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/9e87ec2bfa2f4c32ab3ddfcd68532a2a/26849063972.pdfIn PDF document text
    • http://bocghedanang.com/media/ftp/file/deguvul.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b25f87ba52c---79721107494.pdfIn PDF document text
    • http://ibb-online.ru/f/file/vuxivuje.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609cf5ce52d99---32274710342.pdfIn PDF document text
    • http://cjandjunemillerfarm.com/clients/75830/File/89822626022.pdfIn PDF document text
    • http://hz-karavany.cz/ckfinder/userfiles/files/vumewabo.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df99b5ea34c---domabo.pdfIn PDF document text
    • https://www.autodepotperformancegroup.ca/wp-content/plugins/super-forms/uploads/php/files/nbs8spvsqmhkvuvlrn8bdd52ip/75794223607.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/eb0e405bd6e32e4a46293040643dffb9/51671862483.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/q15oj96pkm7neiflld6u1na96q/sutagutakajowezalit.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088ed2f854e9---59569126573.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a04fa008e95---tekusobunutukone.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b34c6169c52---riwax.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/fipedotifutozozilifevawot.pdfIn PDF document text
    • http://weingut-suppan.at/files/figagufujo.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/sjsvhnogg6qbrm9ue9vo69lf1u/bezolerijogetulok.pdfIn PDF document text
    • http://www.aadhar-interior.com/userfiles/file/73861597651.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/9t1pgrhdcqi3gils6epfi0d950/85742037298.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=difference+between+plant+tissue+and+animal+tissuePDF 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_off00010c27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C27 17100 bytes
SHA-256: b1e7e99e6ac8ee2dae7a066baf55c0177bf86fb17b0222749a65b752ebbbf436
font_01_sfnt_off000138c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000150d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150D7 10988 bytes
SHA-256: 98b6677c21f8c0d45091ad85dcbfece90ec35fc4c2473c099494cd25312bfb00