Malicious PDF — malware analysis report

Static analysis result for SHA-256 c32aa9d7b8b7243e…

MALICIOUS

PDF

76.0 KB Created: 2021-06-14 07:52:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 6b03a577057b6d44cedc749f6063390e SHA-1: b914b563e2cdc40b3756e0ef4e99a257400a0e8a SHA-256: c32aa9d7b8b7243ee6ad7b2e44cf547c569b50d77bc491ce11ea52507d50a29e
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://synerhu.ru/uplcv?utm_term=accounts+ts+grewal+class+11+book+pdf PDF link annotation
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce834c63db---suriv.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/ruvuxuvadolixikaxopa.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/aae170bc79dfa2288dc3947fecdf809e/zokinokefibep.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/16084b51f3c944---65645214977.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/160b77737a6fef---vosixejutoba.pdfIn PDF document text
    • https://kopari.hu/files/file/gogogep.pdfIn PDF document text
    • https://service-panev.com/userfiles/xopunuzezatumidefakomekip.pdfIn PDF document text
    • http://vdadanang.vn/app/webroot/assets/files/nubulatomekojid.pdfIn PDF document text
    • http://agendaalzheimer.org/files/galeria/files/92707602739.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/04ffa31051d943e0ca8e0327a3e11911/xulobixuziko.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/81c5bf8dc81109330788aedb5a5304f4/vukevojemasunu.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/kefoximupulagesiwiw.pdfIn PDF document text
    • https://annjulieskarpmo.com/userfiles/file/sezaga.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609d6d70126a1---sorunewij.pdfIn PDF document text
    • http://broorybulldogs.com/clients/33993/File/74790444957.pdfIn PDF document text
    • https://comfortinnbarrie.com/phpsites/vertical_living/uploads/file/93781691079.pdfIn PDF document text
    • http://lotusromeo.fr/app/webroot/files/userfiles/files/wuxetironurigulupezav.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e248.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE248 1696 bytes
SHA-256: a63dc7203ceba2031beaf1d50b83973ffdd0483474384fa5780efc3deacec6ca
font_01_sfnt_off0000ea72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA72 5660 bytes
SHA-256: a6836aa36be1ec17c11207b4083146879332cddf09f7480b73eaf80e686eda2e
font_02_sfnt_off0000fddd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDDD 10824 bytes
SHA-256: ccf0b25da0484825dba35a3bfaa86d0139d45a896e3f8620fdf5212670568d36

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