Malicious PDF — malware analysis report

Static analysis result for SHA-256 9300f816d930cc30…

MALICIOUS

PDF

119.4 KB Created: 2021-06-25 21:24:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 21d5c681b943b715cf9fee0b05aafa02 SHA-1: 59e58073d33f7728146aeb6aa311700ed07f17fd SHA-256: 9300f816d930cc30e7b0932133a5cd0d33bb6ee7d2037baa104de1839c5070f6
164 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress sites and potentially disposable hosting. The presence of external URIs and a link farm structure suggests an attempt to lure users to malicious or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/4915c439e3b69fa909878a8ee7f4a707/2917760580.pdf In PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/89fab0279085e3f86bf1708816d18e7b/10690820143.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/16088da0a27849---12935907817.pdfIn PDF document text
    • http://kythuatviet.vn/uploads/userfiles/file/41721275180.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072e77a261ca---66471288974.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/47dc5081e9c752ec7cd43e8516494a00/99628209369.pdfIn PDF document text
    • https://mednet.mk/public_html/upload/userfiles/file/ditamabumupokaxis.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609c60a6b804e---vopijizovifizixigoji.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/tigikanoxesedirijin.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609f2aa0d6e95---43206119567.pdfIn PDF document text
    • http://karimeh.com/public/userfiles/file/36071917711.pdfIn PDF document text
    • https://zoorichi.com/temp/fckeditor/file/fobutukojagazamujowuki.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160943e16a975c---95569249402.pdfIn PDF document text
    • https://www.northwoodmedical.ca/wp-content/plugins/super-forms/uploads/php/files/ikrkqn3k5lj4nffif91s6pkn33/vitedururegubofetanomijar.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/vekulurujowa.pdfIn PDF document text
    • http://bidmitt.com/img/files/file/93935820453.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad17e3065c---sebagereritibivibumilipe.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/16093a73f146a3---zozagajidosuluvilalefob.pdfIn PDF document text
    • http://broadmoor80.com/clients/866172/File/42526849203.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/cbaddfa00f7c6b397e7e53e42ddc591f/74804457548.pdfIn PDF document text
    • http://elskenecologie.nl/files/tasofipugupigima.pdfIn PDF document text
    • https://hyundaia.ru/userfiles/file/4191462728.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607823043d63f---navisunaxemufimugozopu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=the+philippine+political+structure+essayPDF 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_off000170d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x170D5 10648 bytes
SHA-256: ef85b33be5f4233e4cfb3f8fce984d0e3a18d83b38f679db1aa16142e36aafab
font_01_sfnt_off00018932.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18932 17868 bytes
SHA-256: 1812f9c21a9ec0c793b2752ec7d3ed5d4f49e588027543e9aec4e1935a752871
font_02_sfnt_off0001b7ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B7AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1