Malicious PDF — malware analysis report

Static analysis result for SHA-256 069d0bd508c6a428…

MALICIOUS

PDF

77.1 KB Created: 2021-09-09 15:58:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d612dee5867a4f70ed4e0b7323f6db7c SHA-1: 3031b44949eea2a91e8285aa630993f127740a24 SHA-256: 069d0bd508c6a428cb9067ec4600a7527df2da60c3809b789913893dde60cf90
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document contains a large number of embedded URLs, many of which point to other PDF files hosted on various domains. The ML classifier strongly indicated maliciousness, and the heuristics suggest this is a link farm, potentially for SEO manipulation or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://archism.ru/uplcv?utm_term=react+native+apk+decompile PDF link annotation
    • https://hilanguage-com-tw.triangle-design.com/files/molowesuborukuzobemuw.pdfIn PDF document text
    • http://peoplefineart.com/assets/202109/files/20210907083307874816.pdfIn PDF document text
    • http://liveisagenix.com/ckfinder/userfiles/files/58109750836.pdfIn PDF document text
    • https://stepweystudy.com/ckfinder/userfiles/files/99626015291.pdfIn PDF document text
    • http://americasbestmanassas.com/uploads/files/vubojanimofutemubip.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/161392a11228d2---netumifimezevapil.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613904cc7196b---29534903170.pdfIn PDF document text
    • http://studiolaviano.it/userfiles/files/vojuvonakudonuzipawovur.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6bff5aa26---56846674051.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/161362011d9584---57873828712.pdfIn PDF document text
    • https://hotelmitrutarija.com/uploaded/files/xilakusafopogor.pdfIn PDF document text
    • http://cestovni-postylka.eu/userfiles/file/dalitinigenudirawomex.pdfIn PDF document text
    • https://lexcochoralsoc.org/demo/lccs/beta/userfiles/files/wetox.pdfIn PDF document text
    • http://thechitay.com/uploads/userfiles/file/nanulajifawoluzubagidaxi.pdfIn PDF document text
    • https://n-tlg.com/files/file/1599758089.pdfIn PDF document text
    • https://samsungklima.net/upload/ckfinder/files/17233459582.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-9-7/20210907134658157697.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/jiwakejaf.pdfIn PDF document text
    • https://philly.drinkpoint.com/uploads/files/jawidodukerepumakezitova.pdfIn PDF document text
    • http://www.premiumimport.nl/ckfinder/userfiles/files/nataxitunixijavojukikob.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613320b70ddf8---35345622382.pdfIn PDF document text
    • https://happyjourney.webtrails.in/ckfinder/userfiles/files/67215333654.pdfIn PDF document text
    • https://dehaventransportation.com/home/de/public_html/ckfinder/userfiles/files/38837087722.pdfIn PDF document text
    • https://snowcat.pl/admin/ckfinder/userfiles/files/86408715957.pdfIn PDF document text
    • https://medium.com/buggountywriteup/lets-know-how-i-ave-esplored-leIn 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_off0000cb09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB09 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e31b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE31B 16780 bytes
SHA-256: 5b4d1db5eeac58747b8a42fae87e9e6766605a289ca6acb84d2e2ac2c1d5e481
font_02_sfnt_off00010e84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E84 10612 bytes
SHA-256: 197736f0f12f1a0bf6e236ab7863a622cbcf7d1f44dfa5d527e359086885fdab

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