Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7a4951bd229b080…

MALICIOUS

PDF

89.3 KB Created: 2021-09-07 18:00:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f4778dc80e5afee38b0497ec7e0517f5 SHA-1: 95d876566023563c30ecd3c4e856ca5e24c98e08 SHA-256: e7a4951bd229b080320c6d5da81b9103435039b2a8918b9ce569f11e4aba267e
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It functions as a link farm, containing numerous URLs that point to compromised CMS uploads and disposable hosting. These links are likely intended to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • 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://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160abe709b7738---29551324894.pdf In PDF document text
    • https://twr1115.net/files/fckeditor/file/18286215884.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/16135ee3f9ec79---7319675505.pdfIn PDF document text
    • https://gsm.company/ckfinder/userfiles/files/26551679808.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160948990528a0---76940721879.pdfIn PDF document text
    • http://fujieshubao.com/zk/UploadFile/file/2021081616273173499.pdfIn PDF document text
    • http://taiwan-tsai.com/upload/files/tubuvifulagisugazefog.pdfIn PDF document text
    • https://thingstodobahrain.net/ckfinder/userfiles/files/jewenufam.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/939c43dd4a7b6d93a5d37cf38b032429/kaxasuroxurilananorutem.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/cda148ba91c7b66e4b87a87945c072ca/72684294567.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/4qa21fvkp00g1n678nesgjs1v7/bakogezefi.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f0e6e6983f8---81485263636.pdfIn PDF document text
    • http://www.sm.ac.th/ckfinder/userfiles/files/fuzopexilo.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/23fa83d5b394535664988d1cab259dbe/32782471428.pdfIn PDF document text
    • http://trendstyleimage.com/uploads/ckfinder/userfiles/files/57026219016.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb7d38f3cda---zeramomepoz.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c66268dbc09---kesamifulomujubuvelodozel.pdfIn PDF document text
    • http://shipsupply.ru/userfiles/files/10228054123.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081ef4778df9---romevolofonigesutu.pdfIn PDF document text
    • https://cosplay-expo.it/ckfinder/userfiles/files/sopagiwugemujel.pdfIn PDF document text
    • http://elementsgogreen.com/userfiles/file/nafodereluma.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/63923445226.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607e18bc6162a---jatiko.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/lunebumuroguparoz.pdfIn PDF document text
    • https://atamergranit.com/userfiles/file/kibojikuwonugagigag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=16x2+lcd+commands+list+pdfPDF 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_off0000f75b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF75B 10896 bytes
SHA-256: 56c21f6ad77f10a1b9db4e16bdbdcae60a039a0942f82bb02068d16fe12b95ca
font_01_sfnt_off000110a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000128b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128B8 17620 bytes
SHA-256: 0bb2a0552a33310242df1636f55b216873e0ecdf58c52524530dd20d70bdaa84

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