Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c182f09f6d40f88…

MALICIOUS

PDF

85.7 KB Created: 2021-06-26 01:24:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 01372aa930a27fca39c3d53ca9fe584a SHA-1: 87a2cf9bbfb6a9589a0a91e191e048cbf27cd04c SHA-256: 5c182f09f6d40f8853155c0e5ee6a1b84c98f9135846812d29d22d8db519d6f3
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains a link farm with multiple URLs pointing to compromised WordPress sites and disposable hosting, disguised as a rent receipt template. The primary attack pattern involves luring users to click these links, likely to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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 http://koryosushi.com/uploads/files/66443477730.pdf In PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/6i7istdlu45q19pagu35ad2lb5/wigazupojebaf.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/d3f668fff9d9e25b37acf46ab457f513/tusopikavini.pdfIn PDF document text
    • https://sinhadventure.com/uploads/file/33909333207.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/16078ec070f03f---90446205808.pdfIn PDF document text
    • http://gewoongroen.eu/app/webroot/files/userfiles/files/72526222234.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b0dcaf224b6---53285733829.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/222dc05243c2b7abe9f6c6b4ed568d7a/96062249863.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/bcelfoqu5bdpvvuetingk9l8l3/69417500998.pdfIn PDF document text
    • http://ecompletecontact.com/ckfinder/userfiles/files/71475951497.pdfIn PDF document text
    • https://sanruouvang.net/images/uploaded/file/wenupax.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/30179362076.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607a50964a734---fibosugerizu.pdfIn PDF document text
    • http://alexhoffordphotography.com/temp/files/file/lagurexonubofoni.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/42945725c80abb634d67f4389f0bdc4a/dixinupujeterig.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/2q9hvdqbr0r92kvofst6g9ijp6/92755050350.pdfIn PDF document text
    • http://jump360.co/upload/files/20210607081609.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160946fe6d356c---40896565951.pdfIn PDF document text
    • http://alphabodysupplements.com/newerac2c/userfiles/file/71461635640.pdfIn PDF document text
    • http://www.asslar.de/downloads/remesu.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/acbd72e7b7ff058182015567e0b4c0d7/gojojabivesipobegubara.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081a895c0704---62852738478.pdfIn PDF document text
    • https://llsindia.in/FCKeditor/file/94271640010.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=annual+rent+receipt+templatePDF 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_off0000eca3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA3 10328 bytes
SHA-256: c0b12d9d3b5e0c448acf454bd0ab10d028be0d4abf9de0b8a83252aee51fb6d8
font_01_sfnt_off000103e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E2 17488 bytes
SHA-256: 244209dd1a873d44da4c8a271dc9601d68c0c8c8c27e5ca7e4f71715f684f1f1
font_02_sfnt_off000131a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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