Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0add83ed8c261bf…

MALICIOUS

PDF

77.7 KB Created: 2021-09-18 14:56:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6aa3518f1429e04176c3238b11b5154e SHA-1: 20b8f9384337572a8fa486d2047bb1ced14bcc37 SHA-256: f0add83ed8c261bf08b1fc4063a54f1c85b32507438c22d0fc144cfdfe28abd9
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to domains identified as compromised or disposable, suggesting a link farm designed to redirect users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery through these links. The presence of multiple PDF link farm heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://eg-connect.com/php_codes/Scott/VieauAssociates/code/userfiles/file/84154871563.pdf In PDF document text
    • http://yoshitomo-kokubunji.com/jcfiles/file/82636226789.pdfIn PDF document text
    • http://eshop-kocicinadeje.cz/files/file/93511109827.pdfIn PDF document text
    • https://steammining.com/userfiles/file/batowonukiputujesekemigu.pdfIn PDF document text
    • https://duvanco.be/docs/files/naberatajetir.pdfIn PDF document text
    • https://8foro.exceltur.org/exceltur_nuevo/ckfinder/userfiles/files/xarukukasudor.pdfIn PDF document text
    • https://thefencedocumentary.com/adminfiles/file/94738645114.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/23748773490.pdfIn PDF document text
    • https://eagleegg5k.com/ckfinder/triplebuserfiles/file/90545253194.pdfIn PDF document text
    • http://sellmysayarah.com/userfiles/files/sunibakuj.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/15a4adcaca6dbeb7727d806b456a956f/resagegowavewigasovilej.pdfIn PDF document text
    • http://sensitiva.fi/UserFiles/File/zejebogidajilufajenob.pdfIn PDF document text
    • https://hearing-outlet.com/uploads/files/202109172313319824.pdfIn PDF document text
    • https://stillwaiting.org/userfiles/file/7261583559.pdfIn PDF document text
    • http://daehnfeldt.com/userfiles/file/vonaremibajuzazawuro.pdfIn PDF document text
    • http://joesservicecenternj.com/userfiles/files/xarabene.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/161312db838d69---22897952889.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/83264b68951850aecc755b7892af0554/vaxikovekibeliwogoxebejo.pdfIn PDF document text
    • http://sherwoodonionfestival.com/ckfinder/userfiles/files/jipozezomowutug.pdfIn PDF document text
    • https://zhavezbozi.cz/data/file/mobatijowizewokovodetegos.pdfIn PDF document text
    • http://koopmankennedyfeller.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/29119756542.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16135b2a5449b1---batitugomemifatobe.pdfIn PDF document text
    • http://sobinco.cz/ckfinder/userfiles/files/sudipiw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=reset+android+phone+to+factory+settings+without+passcodePDF 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_off0000ca8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA8F 11200 bytes
SHA-256: 99c134b5a32f4b642d9bd403fd0e06b4f7e70cf525fb3bab0449c08b95bd73a8
font_01_sfnt_off0000e4a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fcb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB2 17028 bytes
SHA-256: 76645761735f460cd0ff28e07725e95023e3de4e480e22aac308da1123c6b8fa

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