Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5c029162bd0815f…

MALICIOUS

PDF

82.0 KB Created: 2021-09-14 12:04:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b1caed9de1719330bfb4199a1c55fe80 SHA-1: 7ff1c71131f785794c5b7db98300857a2fc87753 SHA-256: f5c029162bd0815f302919948d2d59fee6bbd479cbac17e569b8b22384e32215
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier strongly flagged this PDF as malicious, and heuristics identified it as a link farm with compromised CMS upload links. No scripts were extracted, but the primary attack pattern involves luring users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://ketchas.ru/uplcv?utm_term=zombies+%26+puzzles+mod+apk PDF link annotation
    • http://around-sicily.net/userfiles/file/dixupufodefawesonug.pdfIn PDF document text
    • http://laboratoriodiprogettazione-ve.it/userfiles/files/78990761831.pdfIn PDF document text
    • https://kingcom.edesign.fr/gr33/web/uploads/assets/file/gegezapiko.pdfIn PDF document text
    • https://rainbowfurnitures.com/files/files/zavakatobinowemikevem.pdfIn PDF document text
    • http://stamforgtechnologies.com/uploads/12243438952.pdfIn PDF document text
    • http://kerama.altrodesign.eu/ckfinder/userfiles/files/87438120701.pdfIn PDF document text
    • http://fotografoenricogiampieri.it/userfiles/files/setisaduze.pdfIn PDF document text
    • http://levant-tekstil.com/other_files/File/nuluwugodirar.pdfIn PDF document text
    • https://clearpatth.com/userfiles/file/gawepam.pdfIn PDF document text
    • https://1tlstar.com/storage/uploads/files/gotep.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16140524d402fd---sozapatu.pdfIn PDF document text
    • http://futsalcb.cz/picture/vtextu/file/33771266580.pdfIn PDF document text
    • http://librojuridico.com/aym_images/files/kamiveribakoju.pdfIn PDF document text
    • http://www.casasemio.com.br/ckfinder/userfiles/files/89956131190.pdfIn PDF document text
    • http://runo34.ru/attachments/file/20127768706.pdfIn PDF document text
    • https://presstone.hu/userfiles/file/49547063464.pdfIn PDF document text
    • http://delfosventures.eu/userfiles/files/viwedewevugizugepo.pdfIn PDF document text
    • http://gardenofsound.com/userfiles/files/54871290055.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613239756bf82---35006994595.pdfIn PDF document text
    • http://xn--b1adcbbai1bezln.xn--p1ai/content/File/lojuwonedonexif.pdfIn PDF document text
    • http://www.mecateengenharia.com.br/ckfinder/userfiles/files/64853177402.pdfIn PDF document text
    • http://rpsbchamber.org/editorData/file/54567780546.pdfIn PDF document text
    • https://kompaspt2.com/contents/files/97824547364.pdfIn PDF document text
    • https://xinpayflow.com/ckfinder/userfiles/files/86846795277.pdfIn PDF document text
    • http://designerhouse.ru/upload/files/besikin.pdfIn PDF document text
    • https://karate2.cdmedia.pl/userfiles/file/12835657516.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/16138c6906a6e6---79501040963.pdfIn PDF document text
    • http://baloneacessorios.com/_upload/file///sabikozezazarevenulo.pdfIn 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_off0000def6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f708.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF708 17492 bytes
SHA-256: d4725b23a67ba6c4b8ad764028c790075f83ec4f4b09990530f427b1d5073b5a
font_02_sfnt_off000124a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124A5 9856 bytes
SHA-256: be3644ac7e81786f2972feba8e6d6e96b068feb80028b8033e870d1515a43cc6

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