Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b839006be6bc207…

MALICIOUS

PDF

84.7 KB Created: 2021-07-17 12:01:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0b8b1821318ffad8544cf118032733b1 SHA-1: e9f018bf154b7a22f93dfb01fb9488221623f63b SHA-256: 7b839006be6bc207a6619ceb71f1120f5e3e811b9b037debcedf30a750963e5b
96 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs pointing to compromised CMS upload directories, indicating it functions as a link farm. The ML classifier strongly suggests malicious intent, likely to redirect users to malicious content or phishing sites. The presence of multiple compromised hosts and the use of SEO-related terms in URLs suggest an attempt to distribute malware or facilitate further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160c86d040b52d---suram.pdf In PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/56591a4cd49c4a7c571a6111b766294c/natimaxerinemeguli.pdfIn PDF document text
    • https://semineebrasov.ro/printuri-fi/files/42470881128.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a8309822a1b---dujogodutudawudul.pdfIn PDF document text
    • http://www.flamanville-76.fr/upload/file/fuzitonamukakawuxo.pdfIn PDF document text
    • http://highlandcougars83.com/clients/2/26/268573c5102cd00412bac87cee9346ec/File/32442735983.pdfIn PDF document text
    • http://stardentalcare.org/userfiles/file/95031157305.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/ee353ff2e81c0060c2513f14813075fb/ravabibiwisaxase.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/99212170854.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ba2c57ac919---36165655050.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/ae20af0d426802befb65f14394949f55/68599020034.pdfIn PDF document text
    • https://alrashed-alsaleh.com/userfiles/files/44214250510.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/956404cd6a15886ce6ce85acd2145549/64567750498.pdfIn PDF document text
    • http://dekoblickfang.de/userfiles/file/44277385463.pdfIn PDF document text
    • http://clasesholandes.com/userfiles/file/99892769159.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160dbb0196a420---somuwagopozazefipewowef.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160901f62ab26e---69256804667.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/d900ca351d6e0caec6902ed736120e8a/fafaxewo.pdfIn PDF document text
    • http://dailitara.lt/bites/uploads/file/xiwisamakexamamipo.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/c796b0e1dbbd354501e9c57bf5e63913/kenofufopakafosej.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/b1fef0de2ec60622a45f223418cd4e26/zajisutinikafus.pdfIn PDF document text
    • http://brlairport.com/images/file/85209966522.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160996cb55133d---penowezusopof.pdfIn PDF document text
    • http://p-itos.net/admin/userfile/image/file/55596886427.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=a+sample+of+project+proposal+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_off0000e96f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE96F 16644 bytes
SHA-256: 8edc1200f325c489fc5848be1d31a4c999aa365c794ba571c6053a7c0a919ad3
font_01_sfnt_off000114c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012cdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CDF 10696 bytes
SHA-256: d02ca65fd983555e8e013d2c453894f9c41626388ee371e318f1b8871285c4dc