Malicious PDF — malware analysis report

Static analysis result for SHA-256 e79ae4b61bf30006…

MALICIOUS

PDF

76.1 KB Created: 2021-09-15 03:15:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 8f81730c0c60a69e0d4ba2d59191e992 SHA-1: 0cdb0555f0dcc728a3fde096cfeb24b78b1227cd SHA-256: e79ae4b61bf3000630563542c55a66ddcb5eedd555fbf3838928f8a2f4875298
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. It contains a link farm pointing to compromised WordPress sites and other disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of multiple unknown URLs and the nature of the heuristics strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/1250481qo0le5eeqb1a7cb17k2/welitogobalagixofevu.pdf In PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614110f7a054d---51351535538.pdfIn PDF document text
    • https://drishtinetcom.in/FCKeditor/file/86612953609.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/38599721300.pdfIn PDF document text
    • http://infracsap.hu/files/file/tomugo.pdfIn PDF document text
    • http://oletrans.sk/editor_uploads/files/muxexoxipupijafe.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/p5umjk99mn0dkfr30vmfrg56p5/32785301548.pdfIn PDF document text
    • https://hotnewsmd.deca.md/upload/userfiles/files/69962719691.pdfIn PDF document text
    • https://whiteplacard.com/UserFiles/file/wowororobevagaza.pdfIn PDF document text
    • http://cuiquji.net/d/files/52202824361.pdfIn PDF document text
    • http://numere-mopede.ro/mm/file/pufesirutew.pdfIn PDF document text
    • http://www.kotolantopeni.cz/files/woludepin.pdfIn PDF document text
    • http://progettogeometra.it/userfiles/files/86525799136.pdfIn PDF document text
    • http://solarwindependence.com/ckfinder/userfiles/files/48217452396.pdfIn PDF document text
    • http://konsultacjenaukowe.eu/Upload/file/rujafuwudowokesopufo.pdfIn PDF document text
    • https://edinburghpools.com/contents/files/90904380005.pdfIn PDF document text
    • http://yidaig.com/uploadfile/file/20210907051121.pdfIn PDF document text
    • https://bepcongnghiepphuchung.vn/userfiles/file/gowoxozel.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161320790b1071---34768861156.pdfIn PDF document text
    • http://mawaevents.com/uploads/file/43955298467.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=lucky+patchers+apkPDF 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_off0000c65e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC65E 17276 bytes
SHA-256: e61b0b847bdd511a7ef3024bb745a4300bd6e9f1a4e62ead41401090df02d370
font_01_sfnt_off0000f366.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF366 10372 bytes
SHA-256: 40f003a4660f25c9067874dff97d2864387c5f0ef0706155ac647625ee19b72d
font_02_sfnt_off00010b22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B22 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1