Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f311673d3d6c0a5…

MALICIOUS

PDF

93.3 KB Created: 2021-08-14 01:49:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 2a49b0272da338a482f4f591a37ae5f3 SHA-1: 2d1beed4fdb7d1004d123c1c4980a99297ffaad2 SHA-256: 7f311673d3d6c0a5f752a9c2d8a81839f389be716eb1ca760a88d8331eade0dc
104 Risk Score

Malware Insights

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

The PDF contains numerous links to external resources, many of which are hosted on compromised CMS upload directories, suggesting a link farm designed to distribute malware. The presence of a 'download button' heuristic further supports the intent to trick users into downloading a malicious file. The ML classifier strongly indicates maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/7a1a6f6373c0ac982b0543449f694dd8/rawisore.pdf In PDF document text
    • http://ekonopuntos.com/campannas/file/zemefifabawizutuzep.pdfIn PDF document text
    • http://badaranquehablar.com/userfiles/files/19409348280.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/vodujujud.pdfIn PDF document text
    • https://lamaisonducoeur.ca/upload/editor/file/puranawal.pdfIn PDF document text
    • https://llsindia.in/FCKeditor/file/gatekuzodanagunevijax.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072d00c0866c---95656006162.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608e9d54cf3bf---remoduraj.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/ce8ad3bb46f03cb63e94e4c61de2bb18/86217913807.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070a465d3849---43398552128.pdfIn PDF document text
    • http://parfumkin.ru/files/files/43295790296.pdfIn PDF document text
    • http://bjbtrh.com/files/pic/file/tokajoxifelewidalisuloned.pdfIn PDF document text
    • https://ropaalmayoreo.com/images/userfiles/file/91818604703.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b80e05a224a---zotasevuludotokusikevawet.pdfIn PDF document text
    • http://ranjitabiswas.com/userfiles/files/70686908666.pdfIn PDF document text
    • http://espokebar.com/uploads/files/67297540912.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c0a7ac6983f---40093878992.pdfIn PDF document text
    • https://locktactyuma.com/ckfinder/userfiles/files/gonexuleji.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607599106da7b---17036349764.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/11559825308.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/add934c5ff5ee5002d86eb65b1404022/74315949889.pdfIn PDF document text
    • http://livelyway.com/ckfinder/userfiles/files/suzapozafegomeratutodig.pdfIn PDF document text
    • https://galedo.cz/www/data/cms_files/files/85026001018.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=nvidia+driver+crashing+windows+10+2020PDF link annotation
    • https://www.posluh.hr/ckfinder/userfiles/files/56445645980.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_off000108d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108D8 10928 bytes
SHA-256: 18b6d0064850fdb6df8f36424d786ade9709b22f74f24d716215ce4ba5b600f0
font_01_sfnt_off00012204.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12204 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013a16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A16 17316 bytes
SHA-256: 496bffa846aca3105b9395be0956207187e63d5c3549d39519b10ae3d355dbb4